IAM-20680HP
High Performance Automotive 6-Axis MotionTracking Device
GENERAL DESCRIPTIONAPPLICATIONSThe IAM-20680HP is a 6-axis MotionTracking device for
Automotive non-safety applications that combines a 3axis gyroscope and a 3-axis accelerometer in a small
3x3x0.75mm3 (16-pin LGA) package. It also features a4096-byte FIFO that can lower the traffic on the serial
bus interface and reduce power consumption by allowing
the system processor to burst read sensor data and thengo into a low-power mode. IAM-20680HP, with its 6-axis
integration, enables manufacturers to eliminate thecostly and complex selection, qualification, and systemlevel integration of discrete devices, guaranteeing
optimal motion performance.
The gyroscope has a programmable full-scale range of±250 dps, ±500 dps, ±1000 dps and ±2000 dps. The
accelerometer has a user-programmable accelerometer
full-scale range of ±2g, ±4g, ±8g, and ±16g. Factorycalibrated initial sensitivity of both sensors reduces
production-line calibration requirements.
Other industry-leading features include on-chip 16-bit
ADCs, programmable digital filters, an embedded
temperature sensor, and programmable interrupts. The
device features I2C and SPI serial interfaces, a VDD
operating range of 1.71V to 3.6V, and a separate digital
IO supply, VDDIO from 1.71V to 3.6V.

BLOCK DIAGRAM
IAM-20680HP
INT
Self
test

X Accel

ADC

Self
test

Y Accel

ADC

Interrupt
StatusRegister

NCS
Slave I2C and
SPI SerialInterface

FIFO

SDO
SCLK
SDI

Z Accel

ADC

Self
test

X Gyro

ADC

Self
test

Y Gyro

ADC

Self
test

Z GyroADC

Signal Conditioning

Self
test

User & Config
Registers

IAM-20680HP addresses a wide range of Automotive
applications, including but not limited to:• Navigation Systems Aids for Dead Reckoning• Lift Gate Motion Detection• Accurate Location for Vehicle to Vehicle andInfrastructure• 360º View Camera Stabilization and Vision Systems• Head-up display (HUD) and augmented reality HUD• Telematics and Car Alarm• Insurance Vehicle Tracking

ORDERING INFORMATION
PART

AXES

TEMP RANGEPACKAGEMSL*

IAM-20680HP†

X,Y,Z-40°C to +105°C

16-Pin LGA

3†Denotes RoHS and Green-compliant package* Moisture sensitivity level of the package

FEATURES• Digital-output X-, Y-, and Z-axis angular rate
sensors with a user-programmable full-scale rangeof ±250dps, ±500dps, ±1000dps, and ±2000dps.
• Digital-output X-, Y-, and Z-axis accelerometerwith a user-programmable full-scale range of ±2g,
±4g, ±8g, and ±16g
• Integrated 16-bit ADCs
• User-programmable digital filters for gyroscope,
accelerometer, and temperature sensor• Embedded Self-test• Wake-on-motion interrupt for low power
operation of applications processor• Reliability testing performed according to
AEC–Q100: PPAP and qualification data available
upon request• Final test at -40°C, 25°C, and 105°C

FSYNC

TYPICAL OPERATING CIRCUIT

SensorRegisters

1.8 – 3.3VDC

RESV

VDD
C4, 2.2 mF

C2, 0.1 mF

16
Temp Sensor

REGOUT

15

14

C1, 0.47 mF

ADC

VDDIO

1.8 – 3.3 VDC
Bias & LDOs

Charge
Pump
VDD

GND

C3, 10 nF

SCLSDA

REGOUTAD0

VDDIO

SCL/SPC

SDA/SDI
SA0/SDO
CS

13

1

2
3

12

IAM-20680HP

4

10

5

9

8

RESV

INT

InvenSense, Inc.
1745 Technology Drive, San Jose, CA 95110 U.S.A+1(408) 988–7339
www.invensense.com

7

FSYNC

6

InvenSense, Inc. reserves the right to change
specifications and information herein without notice
unless the product is in mass production and thedatasheet has been designated by InvenSense inwriting as subject to a specified Product / Process
Change Notification Method regulation.

11

Document Number: DS-000409
Revision: 1.2
Rev. Date: 12/10/2020

GND

RESV
RESV

RESV
RESV

IAM-20680HP
TABLE OF CONTENTS
General Description ............................................................................................................................................. 1
Block Diagram ...................................................................................................................................................... 1
Applications ......................................................................................................................................................... 1
Ordering Information ........................................................................................................................................... 1
Features ............................................................................................................................................................... 1
Typical Operating Circuit...................................................................................................................................... 1
TABLE OF CONTENTS....................................................................................................................................................... 2
LIST OF FIGURES .............................................................................................................................................................. 5
LIST OF TABLES ................................................................................................................................................................ 6
1

Introduction ......................................................................................................................................................... 7
Purpose and Scope .................................................................................................................................... 7
Product Overview...................................................................................................................................... 7
Applications............................................................................................................................................... 7

2

Features ............................................................................................................................................................... 8
Gyroscope Features .................................................................................................................................. 8
Accelerometer Features ............................................................................................................................ 8
Additional Features ................................................................................................................................... 8

3

Electrical Characteristics ...................................................................................................................................... 9
Gyroscope Specifications .......................................................................................................................... 9
Accelerometer Specifications.................................................................................................................. 10
Electrical Specifications ........................................................................................................................... 11
I2C Timing Characterization ..................................................................................................................... 14
SPI Timing Characterization .................................................................................................................... 15
Absolute Maximum Ratings .................................................................................................................... 16
Thermal Information ............................................................................................................................... 16

4

Applications Information ................................................................................................................................... 17
Pin Out Diagram and Signal Description ................................................................................................. 17
Typical Operating Circuit ......................................................................................................................... 18
Bill of Materials for External Components .............................................................................................. 18
Block Diagram ......................................................................................................................................... 19
Overview ................................................................................................................................................. 19
Three-Axis MEMS Gyroscope with 16-bit ADCs and Signal Conditioning ............................................... 20
Three-Axis MEMS Accelerometer with 16-bit ADCs and Signal Conditioning......................................... 20
I2C and SPI Serial Communications Interfaces ........................................................................................ 20
Self-Test................................................................................................................................................... 21
Clocking............................................................................................................................................... 21
Sensor Data Registers ......................................................................................................................... 21
FIFO ..................................................................................................................................................... 22
Interrupts ............................................................................................................................................ 22

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IAM-20680HP
Digital-Output Temperature Sensor ................................................................................................... 22
Bias and LDOs ..................................................................................................................................... 22
Charge Pump ...................................................................................................................................... 22
Standard Power Modes ...................................................................................................................... 22
Sensor Initialization and Basic Configuration ..................................................................................... 22
5

Programmable Interrupts .................................................................................................................................. 24
Wake-on-Motion Interrupt ..................................................................................................................... 24

6

Digital Interface ................................................................................................................................................. 25
I2C and SPI Serial Interfaces .................................................................................................................... 25
I2C Interface............................................................................................................................................. 25
IC Communications Protocol ................................................................................................................... 25
I2C Terms ................................................................................................................................................. 27
SPI Interface ............................................................................................................................................ 28

7

Serial Interface Considerations .......................................................................................................................... 29
IAM-20680HP Supported Interfaces ....................................................................................................... 29

8

Register Map ...................................................................................................................................................... 30

9Register Descriptions ......................................................................................................................................... 32
Registers 0 to 2 – Gyroscope Self-Test Registers .................................................................................... 32
Registers 13 to 15 – Accelerometer Self-Test Registers.......................................................................... 32
Register 19 – Gyro Offset Adjustment Register ...................................................................................... 33
Register 20 – Gyro Offset Adjustment Register ...................................................................................... 33
Register 21 – Gyro Offset Adjustment Register ...................................................................................... 33
Register 22 – Gyro Offset Adjustment Register ...................................................................................... 33
Register 23 – Gyro Offset Adjustment Register ...................................................................................... 34
Register 24 – Gyro Offset Adjustment Register ...................................................................................... 34
Register 25 – Sample Rate Divider .......................................................................................................... 34
Register 26 – Configuration ................................................................................................................ 34
Register 27 – Gyroscope Configuration .............................................................................................. 35
Register 28 – Accelerometer Configuration ....................................................................................... 35
Register 29 – Accelerometer Configuration 2..................................................................................... 36
Register 30 – Low Power Mode Configuration ................................................................................... 37
Register 31 – Wake-on Motion Threshold (Accelerometer) ............................................................... 38
Register 35 – FIFO Enable ................................................................................................................... 39
Register 54 – FSYNC Interrupt Status.................................................................................................. 39
Register 55 – INT Pin / Bypass Enable Configuration .......................................................................... 39
Register 56 – Interrupt Enable ............................................................................................................ 40
Register 58 – Interrupt Status ............................................................................................................. 40
Registers 59 to 64 – Accelerometer Measurements .......................................................................... 40
Registers 65 and 66 – Temperature Measurement ............................................................................ 41
Registers 67 to 72 – Gyroscope Measurements ................................................................................. 41

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IAM-20680HP
Register 104 – Signal Path Reset......................................................................................................... 42
Register 105 – Accelerometer Intelligence Control ............................................................................ 42
Register 106 – User Control ................................................................................................................ 43
Register 107 – Power Management 1 ................................................................................................ 43
Register 108 – Power Management 2 ................................................................................................ 44
Registers 114 and 115 – FIFO Count Registers ................................................................................... 44
Register 116 – FIFO Read Write .......................................................................................................... 45
Register 117 – Who Am I .................................................................................................................... 45
Registers 119, 120, 122, 123, 125, 126 Accelerometer Offset Registers ............................................ 45
10

Assembly ............................................................................................................................................................ 47
Orientation of Axes ............................................................................................................................. 47
Package Dimensions ........................................................................................................................... 48

11

Part Number Package Marking .......................................................................................................................... 50

12Reference ........................................................................................................................................................... 51

13

Errata ................................................................................................................................................................. 52
Errata item #1: WOM ODR configuration bits .................................................................................... 52

14

Revision History ................................................................................................................................................. 53

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Revision: 1.2

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IAM-20680HP
LIST OF FIGURES
Figure 1. I2C Bus Timing Diagram ............................................................................................................................................................. 14
Figure 2. SPI Bus Timing Diagram............................................................................................................................................................. 15
Figure 3. Pin out Diagram for IAM-20680HP 3.0x3.0x0.75 mm3 LGA ...................................................................................................... 17
Figure 4. IAM-20680HP LGA Application Schematic ................................................................................................................................ 18
Figure 5. IAM-20680HP Block Diagram .................................................................................................................................................... 19
Figure 6. IAM-20680HP Solution Using I2C Interface ............................................................................................................................... 20
Figure 7. IAM-20680HP Solution Using SPI Interface ............................................................................................................................... 21
Figure 8. START and STOP Conditions ...................................................................................................................................................... 25
Figure 9. Acknowledge on the I2C Bus ..................................................................................................................................................... 26
Figure 10. Complete I2C Data Transfer ..................................................................................................................................................... 26
Figure 11. Typical SPI Master/Slave Configuration .................................................................................................................................. 28
Figure 12. I/O Levels and Connections ..................................................................................................................................................... 29
Figure 13. Orientation of Axes of Sensitivity and Polarity of Rotation .................................................................................................... 47
Figure 14. Package Dimensions................................................................................................................................................................ 48
Figure 15. Part Number Package Marking ............................................................................................................................................... 50

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IAM-20680HP
LIST OF TABLES
Table 1. Gyroscope Specifications ............................................................................................................................................................. 9
Table 2. Accelerometer Specifications ..................................................................................................................................................... 10
Table 3. D.C. Electrical Characteristics ..................................................................................................................................................... 11
Table 4. A.C. Electrical Characteristics ..................................................................................................................................................... 13
Table 5. Other Electrical Specifications .................................................................................................................................................... 13
Table 6. I2C Timing Characteristics ........................................................................................................................................................... 14
Table 7. SPI Timing Characteristics (8 MHz Operation) ........................................................................................................................... 15
Table 8. Absolute Maximum Ratings ....................................................................................................................................................... 16
Table 9. Thermal Information .................................................................................................................................................................. 16
Table 10. Signal Descriptions ................................................................................................................................................................... 17
Table 11. Bill of Materials ........................................................................................................................................................................ 18
Table 12. Standard Power Modes for IAM-20680HP ............................................................................................................................... 22
Table 13. Table of Interrupt Sources........................................................................................................................................................ 24
Table 14. Serial Interface ......................................................................................................................................................................... 25
Table 15. I2C Terms .................................................................................................................................................................................. 27
Table 16. Register Map ............................................................................................................................................................................ 31
Table 17. Configuration............................................................................................................................................................................ 35
Table 18. Accelerometer Data Rates and Bandwidths (Low Noise Mode) .............................................................................................. 36
Table 19. Accelerometer Filter Bandwidths, Noise, and Current Consumption (Low-Power Mode) ...................................................... 37
Table 20. Example Configurations for Gyroscope Low-Power Mode ...................................................................................................... 38
Table 21. Package Dimensions ................................................................................................................................................................. 49
Table 22. Part Number Package Marking ................................................................................................................................................ 50

Document Number: DS-000409
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IAM-20680HP
1 INTRODUCTIONPURPOSE AND SCOPE
This document is a product specification, providing description, specifications, and design related information on the IAM-20680HP
Automotive MotionTracking device. The device is housed in a small 3x3x0.75 mm3 16-pin LGA package.

PRODUCT OVERVIEWThe IAM-20680HP is a 6-axis MotionTracking device for Automotive non-safety applications, that combines a 3-axis gyroscope and a
3-axis accelerometer in a small 3x3x0.75 mm (16-pin LGA) package. It also features a 4096-byte FIFO that can lower the traffic on theserial bus interface and reduce power consumption by allowing the system processor to burst read sensor data and then go into a
low-power mode. IAM-20680HP, with its 6-axis integration, enables manufacturers to eliminate the costly and complex selection,
qualification, and system level integration of discrete devices, guaranteeing optimal motion performance.
The gyroscope has a programmable full-scale range of ±250 dps, ±500 dps, ±1000 dps, and ±2000 dps. The accelerometer has a userprogrammable accelerometer full-scale range of ±2g, ±4g, ±8g, and ±16g. Factory-calibrated initial sensitivity of both sensors
reduces production-line calibration requirements.
Other industry-leading features include on-chip 16-bit ADCs, programmable digital filters, an embedded temperature sensor, andprogrammable interrupts. The device features I2C and SPI serial interfaces, a VDD operating range of 1.71V to 3.6V, and a separate
digital IO supply, VDDIO from 1.71V to 3.6V.
Communication with all registers of the device is performed using either I 2C at 400 kHz or SPI at 8 MHz.
By leveraging its patented and volume-proven CMOS-MEMS fabrication platform, which integrates MEMS wafers with companion
CMOS electronics through wafer-level bonding, TDK-InvenSense has driven the package size down to a footprint and thickness of
3x3x0.75 mm (16-pin LGA), to provide a very small yet high-performance, low-cost package. The device provides high robustness by
supporting 10,000g shock reliability.

APPLICATIONS
•
•
•
•
•
•
•
•

Navigation Systems Aids for Dead Reckoning
Lift Gate Motion Detections
Accurate Location for Vehicle to Vehicle and Infrastructure
View Camera Stabilization and Vision Systems
Head-up display (HUD) and augmented reality HUD
Car Alarm
Telematics
Insurance Vehicle Tracking

Document Number: DS-000409
Revision: 1.2

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IAM-20680HP
2 FEATURESGYROSCOPE FEATURES
The triple-axis MEMS gyroscope in the IAM-20680HP includes a wide range of features:••••

Digital-output X-, Y-, and Z-axis angular rate sensors (gyroscopes) with a user-programmable full-scale range of ±250 dps,
±500 dps, ±1000 dps and ±2000 dps and integrated 16-bit ADCs
Digitally-programmable low-pass filter
Factory calibrated sensitivity scale factor
Self-test

ACCELEROMETER FEATURES
The triple-axis MEMS accelerometer in IAM-20680HP includes a wide range of features:••••

Digital-output X-, Y-, and Z-axis accelerometer with a programmable full-scale range of ±2g, ±4g, ±8g and ±16g andintegrated 16-bit ADCs
User-programmable interrupts
Wake-on-motion interrupt for low power operation of applications processor
Self-test

ADDITIONAL FEATURESThe IAM-20680HP includes the following additional features:
•
•
•
•
•
•
•
•
•
•

Smallest and thinnest LGA package for portable devices: 3x3x0.75 mm (16-pin LGA)
Minimal cross-axis sensitivity between the accelerometer and gyroscope axes
4096-byte FIFO buffer enables the applications processor to read the data in bursts
Digital-output temperature sensor
User-programmable digital filters for gyroscope, accelerometer, and temperature sensor
10,000g shock tolerant
400 kHz Fast Mode I2C for communicating with all registers
8 MHz SPI serial interface for communicating with all registers
MEMS structure hermetically sealed and bonded at wafer level
RoHS and Green compliant

Document Number: DS-000409
Revision: 1.2

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IAM-20680HP
3 ELECTRICAL CHARACTERISTICSGYROSCOPE SPECIFICATIONS
Typical Operating Circuit of section 4.2, VDD = 1.8V, VDDIO = 1.8V, TA = 25°C, Full Scale = 2000dps, Low Noise Mode enabled unlessotherwise noted.
All Zero-rate output, sensitivity, and noise specifications include board soldering effects, unless otherwise noted.
PARAMETER
Full-Scale Range

Gyroscope ADC Word Length
Sensitivity Scale Factor

Nonlinearity
Cross-Axis Sensitivity
ZRO Tolerance
ZRO Variation Over Temperature
Rate Noise Spectral Density
Gyroscope Mechanical Frequencies
Low Pass Filter Response
Gyroscope Start Up Time
Output Data Rate

CONDITIONSGYROSCOPE SENSITIVITYMIN

FS_SEL=0
FS_SEL=1
FS_SEL=2
FS_SEL=3
FS_SEL=0
FS_SEL=1
FS_SEL=2
FS_SEL=3
Best fit straight line; 25°C
25°C
ZERO-RATE OUTPUT (ZRO)
All axes, 25°C
All axes, -40°C to +105°C
GYROSCOPE NOISE PERFORMANCE (FS_SEL=1)25°C, initial, Noise BW = 306 Hz
VDD = VDDIO = 1.8V

TYP

MAX

UNITS

NOTES

±250
±500
±1000
±2000
16
131
65.5
32.8
16.4
±0.1
±5

dps
dps
dps
dps
bits
LSB/(dps)
LSB/(dps)
LSB/(dps)
LSB/(dps)
%
%

3
3
3
3
3
3
3
3
3
1
1

±0.8
±0.9

dps
dps

1,2
1,2

dps/√Hz

1,4

250

KHz
Hz
ms

2
3
1

8000

Hz

1

0.005
27

Programmable Range
From Sleep mode, 25°C
Programmable, Normal (Filtered)
mode

5
35
4

Table 1. Gyroscope Specifications
Notes:
1.
2.
3.
4.

Based on characterization data on a limited number of parts.
Tested in production at component level. Over temperature tests are performed at 25°C, 105°C, and/or -40°C.
Guaranteed by design.
Calculated from Total RMS Noise.

Document Number: DS-000409
Revision: 1.2

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IAM-20680HP
ACCELEROMETER SPECIFICATIONS
Typical Operating Circuit of section 4.2, VDD = 1.8V, VDDIO = 1.8V, TA = 25°C, Full Scale = 8g, Low Noise Mode enabled unlessotherwise noted.
All Zero-g output, sensitivity, and noise specifications include board soldering effects, unless otherwise noted.
PARAMETER

Full-Scale Range
ADC Word Length
Sensitivity Scale Factor
Nonlinearity
Cross-Axis Sensitivity
Zero-G Level Tolerance
Zero-G Level Variation Over
TemperaturePower Spectral Density
Low Pass Filter Response
Accelerometer Startup Time
Output Data Rate

CONDITIONSACCELEROMETER SENSITIVITY

MIN

TYP

MAX

UNITS

NOTES

AFS_SEL=0
AFS_SEL=1
AFS_SEL=2
AFS_SEL=3
Output in two’s complement format
AFS_SEL=0
AFS_SEL=1
AFS_SEL=2
AFS_SEL=3Best Fit Straight Line for 2g, 25°C
25°C
ZERO-G OUTPUT
All axes, 25°C

±2
±4
±8
±16
16
16,384
8,192
4,096
2,048
±0.05
±5

g
g
g
g
bits
LSB/g
LSB/g
LSB/g
LSB/g
%
%

3
3
3
3
3
3
3
3
3
1
1

±40

mg

1,2

All axes, -40°C to +105°C

±15

mg

1,2

135

µg/√Hz

1,4

Hz
ms
ms
Hz

3
1
1
1

NOISE PERFORMANCE
Low noise mode, +25°C, initial,
Noise BW = 235 Hz, VDD = VDDIO = 1.8V
Programmable Range
From Sleep mode, 25°C
From Cold Start, 1 ms VDD ramp
Low noise (active)

5

218
4
6

4

4000

Table 2. Accelerometer Specifications
Notes:
1.
2.
3.
4.

Based on characterization data on a limited number of parts.
Tested in production at component level. Over temperature tests are performed at 25°C, 105°C, and/or -40°C.
Guaranteed by design.
Calculated from Total RMS Noise.

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Revision: 1.2

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IAM-20680HP
ELECTRICAL SPECIFICATIONS
D.C. Electrical Characteristics
Typical Operating Circuit of section 4.2, VDD = 1.8V, VDDIO = 1.8V, TA = 25°C, unless otherwise noted.
PARAMETERCONDITIONSSUPPLY VOLTAGES

VDD
VDDIO
Normal Mode

MIN

TYP

MAX

UNITS

NOTES

1.71
1.71

1.8
1.8

3.6
3.6

V
V

1
1

mA
mA
µA
µA

1
1
1
1

°C

1, 2

SUPPLY CURRENTS & BOOT TIME
6-axis Gyroscope + Accelerometer
3-axis Gyroscope
3-axis Accelerometer, 4 kHz ODR

3
2.6
390
6

Full-Chip Sleep Mode
Specified Temperature Range

TEMPERATURE RANGE
Performance parameters are not applicablebeyond Specified Temperature Range

-40

+105

Table 3. D.C. Electrical Characteristics
Notes:
1.
2.

Based on characterization data on a limited number of parts.
Based on qualification.

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IAM-20680HP
A.C. Electrical Characteristics
Typical Operating Circuit of section 4.2, VDD = 1.8V, VDDIO = 1.8V, TA = 25°C, unless otherwise noted.
PARAMETERCONDITIONS

MIN

TYP

MAX

UNITS

NOTES

100

ms

1

105

°C
°C
LSB/°C

1
1
1

100
100
5

ms
ms
ms

1
1
1

0.3*VDDIO

V
V
pF

1

SUPPLIES
Supply Ramp Time (TRAMP)

Operating Range
Room Temperature Offset
Sensitivity

Monotonic ramp. Ramp
rate is 10% to 90% of the
0.01
final value
TEMPERATURE SENSOR
Ambient-40
25°C
Untrimmed

0326.8

POWER-ON RESET

Supply Ramp Time (TRAMP)
Start-up time for register read/write
I2C ADDRESS

Valid power-on RESET
From power-up
From sleep
SA0 = 0SA0 = 10.01
111101000
1101001

DIGITAL INPUTS (FSYNC, SA0, SPC, SDI, CS)

VIH, High Level Input Voltage
VIL, Low Level Input Voltage
CI, Input Capacitance
VOH, High Level Output Voltage
VOL1, LOW-Level Output Voltage
VOL.INT, INT Low-Level Output Voltage
Output Leakage Current
tINT, INT Pulse Width
VIL, LOW Level Input Voltage
VIH, HIGH-Level Input Voltage
Vhys, Hysteresis
VOL, LOW-Level Output Voltage
IOL, LOW-Level Output Current
Output Leakage Current
tof, Output Fall Time from VIHmax to
VILmaxDocument Number: DS-000409
Revision: 1.2

0.7*VDDIO< 10
DIGITAL OUTPUT (SDO, INT)RLOAD=1 MΩ;
0.9*VDDIORLOAD=1 MΩ;
OPEN=1, 0.3 mA sink
Current
OPEN=1LATCH_INT_EN=0
I2C I/O (SCL, SDA)
-0.5V
0.7*VDDIO

0.1*VDDIO
0.1
100
50
0.3*VDDIOVDDIO + 0.5
VCb bus capacitance in pf

0

0.4
3
6
100

20+0.1Cb

1nAµs

0.1*VDDIO
3 mA sink current
VOL=0.4V
VOL=0.6V

V
V
V

300

V
V
V
V
mA
mA
nA
ns

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1

IAM-20680HP

Sample Rate

Clock Frequency Initial Tolerance

Frequency Variation over
Temperature

INTERNAL CLOCK SOURCEFCHOICE_B=1,2,3
SMPLRT_DIV=0FCHOICE_B=0;
DLPFCFG=0 or 7
SMPLRT_DIV=0FCHOICE_B=0;
DLPFCFG=1,2,3,4,5,6;
SMPLRT_DIV=0
CLK_SEL=0, 6 or gyroinactive; 25°C
CLK_SEL=1,2,3,4,5 and gyro
active; 25°C
CLK_SEL=0,6 or gyroinactive
CLK_SEL=1,2,3,4,5 and gyro
active

32

kHz

2

8

kHz

2

1

kHz

2

±1

%

1

±0.2

%

1

±2

%

1

±0.2

%

1

Table 4. A.C. Electrical Characteristics
Notes:
1.
2.

Based on characterization data on a limited number of parts.
Guaranteed by design.

Other Electrical Specifications
Typical Operating Circuit of section 4.2, VDD = 1.8V, VDDIO = 1.8V, TA = 25°C, unless otherwise noted.
PARAMETERSPI Operating Frequency, All
Registers Read/Write

CONDITIONSSERIAL INTERFACEMIN

Low Speed Characterization
High Speed Characterization

SPI Modes
I2C Operating Frequency

All registers, Fast-mode
All registers, Standard-mode

TYP
100
±10%
1
Modes 0
and 3

MAX

UNITS

NOTES

kHz

1

8

MHz

1, 2

400
100

kHz
kHz

1
1

Table 5. Other Electrical Specifications
Notes:
1.
2.

Based on characterization data on a limited number of parts.
SPI clock duty cycle between 45% and 55% should be used for 8-MHz operation.

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Revision: 1.2

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IAM-20680HP
I2C TIMING CHARACTERIZATION
Typical Operating Circuit of section 4.2, VDD = 1.8V, VDDIO = 1.8V, TA = 25°C, unless otherwise noted.
PARAMETERSI2C TIMINGfSCL, SCL Clock Frequency
tHD.STA, (Repeated) START Condition Hold TimetLOW, SCL Low PeriodtHIGH, SCL High PeriodtSU.STA, Repeated START Condition Setup Time
tHD.DAT, SDA Data Hold TimetSU.DAT, SDA Data Setup Timetr, SDA and SCL Rise Timetf, SDA and SCL Fall Time
tSU.STO, STOP Condition Setup Time

CONDITIONSI2C FAST-MODEMIN

Cb bus cap. from 10 to 400 pF
Cb bus cap. from 10 to 400 pF

MAX

UNITS

NOTES

400
0.6

kHz
µs

1
1

1.3
0.6
0.6
0
100
20+0.1Cb
20+0.1Cb
0.6

µs
µs
µs
µs
ns
ns
ns
µs

1
1
1
1
1
1
1
1

µs

1

pF
µs
µs

1
1
1

tBUF, Bus Free Time Between STOP and START
Condition
Cb, Capacitive Load for each Bus LinetVD.DAT, Data Valid Time
tVD.ACK, Data Valid Acknowledge Time

TYP

300
300

1.3
< 400
0.9
0.9
Table 6. I2C Timing Characteristics

Notes:

1.

Based on characterization of 5 parts over temperature and voltage as mounted on evaluation board or in sockets.

tf
SDA

tSU.DAT

tr

70%
30%

70%
30%
continued below at

tf
SCL

tr
70%
30%

S

tHD.STA

tVD.DAT
70%
30%

tHD.DAT
1/fSCLtLOW

1st clock cycle

9th clock cycle

tHIGH

tBUF
SDA

70%
30%

A

tSU.STA

tHD.STA

SCL

70%
30%

Sr

tSU.STO

tVD.ACK
9th clock cycle

P

S

Figure 1. I2C Bus Timing Diagram

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Page 14 of 54AIAM-20680HP
SPI TIMING CHARACTERIZATION
Typical Operating Circuit of section 4.2, VDD = 1.8V, VDDIO = 1.8V, TA = 25°C, unless otherwise noted.
PARAMETERSSPI TIMING
fSPC, SPC Clock Frequency

CONDITIONS

MIN

TYP

MAX

UNITS

NOTES

8

MHz

1

tLOW, SPC Low Period

56

ns

1

tHIGH, SPC High Period

56

ns

1

tSU.CS, CS Setup Time

2

ns

1

tHD.CS, CS Hold Time

63

ns

1

tSU.SDI, SDI Setup Time

3

ns

1

ns

1

ns

1

tHD.SDI, SDI Hold Time

7

tVD.SDO, SDO Valid Time

Cload = 20 pF

tHD.SDO, SDO Hold Time

Cload = 20 pF

40

ns

1

tDIS.SDO, SDO Output Disable Time

6
20

ns

1

tFall, SCLK Fall Time

6.5

ns

2

tRise, SCLK Rise Time

6.5

ns

2

Table 7. SPI Timing Characteristics (8 MHz Operation)
Notes:
1.
2.

Based on characterization of 5 parts over temperature and voltage as mounted on evaluation board or in sockets.
Based on other parameter values.

CS

70%
30%

tFall

tSU;CS
SCLK

tHIGH

tRise

1/fCLK

tHD;CS

70%
30%

tSU;SDI
SDI

70%
30%

tHD;SDItLOW
LSB INMSB INtVD;SDOSDOMSB OUTtDIS;SDO

tHD;SDO70%30%

LSB OUT

Figure 2. SPI Bus Timing Diagram

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IAM-20680HP
ABSOLUTE MAXIMUM RATINGS
Stress above those listed as “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only
and functional operation of the device at these conditions is not implied. Exposure to the absolute maximum ratings conditions forextended periods may affect device reliability.
PARAMETER
Supply Voltage, VDD
Supply Voltage, VDDIOREGOUT
Input Voltage Level (SA0, FSYNC, SCL, SDA)
Acceleration (Any Axis, unpowered)
Operating temperature range
Storage Temperature Range
Electrostatic Discharge (ESD) Protection
Latch-up
Ultrasonic excitation (cleaning/welding/…)

RATING-0.5V to 4V-0.5V to 4V-0.5V to 2V-0.5V to VDDIO + 0.5V
10,000g for 0.2 ms-40°C to 105°C-40°C to 125°C
2 kV (HBM);
750V (CDM corner pins)
500V (CDM all other pins)
JEDEC Class II (2),125°C±100 mA
Not allowed

Table 8. Absolute Maximum Ratings

THERMAL INFORMATIONTHERMAL METRICθJAψJT

DESCRIPTION
Junction-to-ambient thermal resistanceJunction-to-top characterization parameter

VALUE
84.58 °C/W
7 °C/W

Table 9. Thermal Information

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IAM-20680HP
4 APPLICATIONS INFORMATIONPIN OUT DIAGRAM AND SIGNAL DESCRIPTIONPIN NUMBER
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15

PIN NAME
VDDIO
SCL/SPC
SDA/SDI
SA0/SDO
CS
INT
RESV
FSYNC
RESV
RESV
RESV
RESV
GND
REGOUT
RESV

16

VDD

PIN DESCRIPTION
Digital I/O supply voltage
I2C serial clock (SCL); SPI serial clock (SPC)
I2C serial data (SDA); SPI serial data input (SDI)
I2C slave address LSB (SA0); SPI serial data output (SDO)
Chip select (0 = SPI mode; 1 = I2C mode)
Interrupt digital output (totem pole or open-drain)
Reserved. Do not connect
Synchronization digital input (optional). Connect to GND if unused
Reserved. Connect to GND
Reserved. Connect to GND
Reserved. Connect to GND
Reserved. Connect to GND
Connect to GND
Regulator filter capacitor connection
Reserved. Connect to GND
Power Supply
Table 10. Signal Descriptions

Note: VDD, VDDIO, SCL/SPC and CS pins must be correctly managed at power-up to guarantee proper IAM-20680HP start-up. Please refer to sections 4.18.1 and4.18.2 for detailed power-up instructions.

REGOUT
14

VDD

RESV

16 15

VDDIO

1

13

GND

SCL/SPC

2

12

RESV

SDA/SDI3

IAM-20680HP 11

RESV

SA0/SDO

4

10

RESV

CS

5

9

RESV

+Z

6

7

8

INT

RESV

FSYNC

LGA Package (Top View)
16-pin, 3mm x 3mm x 0.75mm
Typical Footprint and thickness+Y+X

Orientation of Axes of Sensitivity and Polarity of Rotation

Figure 3. Pin out Diagram for IAM-20680HP 3.0x3.0x0.75 mm3 LGA

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IAM-20680HP
TYPICAL OPERATING CIRCUIT
1.8 – 3.3VDC
RESV

VDD
C4, 2.2 mF

C2, 0.1 mF

16

VDDIO

1.8 – 3.3 VDC
C3, 10 nF

SCL SCL/SPC
SDA
AD0

VDDIO

SDA/SDI
SA0/SDOCSREGOUT

15

14

C1, 0.47 mF

1

13

2

12

IAM-20680HP

3

11

4

10

5

9

6

7

8

GND

RESV
RESV

RESV
RESV

INT

RESV

FSYNC

Figure 4. IAM-20680HP LGA Application Schematic
Note: I2C lines are open drain and pullup resistors (e.g. 10 kΩ) are required.

BILL OF MATERIALS FOR EXTERNAL COMPONENTSCOMPONENTREGOUT Capacitor
VDD Bypass Capacitors
VDDIO Bypass Capacitor

LABEL

SPECIFICATIONQUANTITY

C1

X7R, 0.47 µF ±10%

1

C2

X7R, 0.1 µF ±10%

1

C4

X7R, 2.2 µF ±10%

1

C3

X7R, 10 nF ±10%

1Table 11. Bill of Materials

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IAM-20680HP
BLOCK DIAGRAM
IAM-20680HP
INT
Self
test

X Accel

ADC

Self
test

Y Accel

ADC

Interrupt
StatusRegisterCS
Slave I2C and
SPI SerialInterface

FIFO

SA0 / SDO
SCL / SPCSDA / SDI

Z Accel

ADC

Self
test

X GyroSelf
test

Y Gyro

ADC

Self
test

Z GyroADC

Temp Sensor

ADC

ADC

Signal Conditioning

Self
test

User & Config
Registers
FSYNC
SensorRegisters

Bias & LDOs

Charge
Pump
VDD

GND

REGOUT

Figure 5. IAM-20680HP Block Diagram

OVERVIEWThe IAM-20680HP is comprised of the following key blocks and functions:
•
•
•
•
•
•
•
•
•
•
•
•

Three-axis MEMS rate gyroscope sensor with 16-bit ADCs and signal conditioning
Three-axis MEMS accelerometer sensor with 16-bit ADCs and signal conditioning
Primary I2C and SPI serial communications interfaces
Self-Test
Clocking
Sensor Data Registers
FIFO
Interrupts
Digital-Output Temperature Sensor
Bias and LDOs
Charge Pump
Standard Power Modes

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IAM-20680HP
THREE-AXIS MEMS GYROSCOPE WITH 16-BIT ADCS AND SIGNAL CONDITIONINGThe IAM-20680HP consists of three independent vibratory MEMS rate gyroscopes, which detect rotation about the X-, Y-, and ZAxes. When the gyros are rotated about any of the sense axes, the Coriolis Effect causes a vibration that is detected by a capacitive
pickoff. The resulting signal is amplified, demodulated, and filtered to produce a voltage that is proportional to the angular rate. This
voltage is digitized using individual on-chip 16-bit Analog-to-Digital Converters (ADCs) to sample each axis. The full-scale range of the
gyro sensors may be digitally programmed to ±250, ±500, ±1000, or ±2000 degrees per second (dps). The ADC sample rate isprogrammable from 8,000 samples per second, down to 3.9 samples per second, and user-selectable low-pass filters enable a wide
range of cut-off frequencies.

THREE-AXIS MEMS ACCELEROMETER WITH 16-BIT ADCS AND SIGNAL CONDITIONINGThe IAM-20680HP’s 3-Axis accelerometer uses separate proof masses for each axis. Acceleration along a particular axis induces
displacement on the corresponding proof mass, and capacitive sensors detect the displacement differentially. The IAM-20680HP’s
architecture reduces the accelerometers’ susceptibility to fabrication variations as well as to thermal drift. When the device is placedon a flat surface, it will measure 0g on the X- and Y-axes and +1g on the Z-axis. The accelerometers’ scale factor is calibrated at thefactory and is nominally independent of supply voltage. Each sensor has a dedicated sigma-delta ADC for providing digital outputs.
The full-scale range of the digital output can be adjusted to ±2g, ±4g, ±8g, or ±16g.

I2C AND SPI SERIAL COMMUNICATIONS INTERFACESThe IAM-20680HP communicates to a system processor using either a SPI or an I2C serial interface. The IAM-20680HP always acts asa slave when communicating to the system processor. The LSB of the I2C slave address is set by pin 4 (SA0).
IAM-20680HP Solution Using I2C Interface
In Figure 6, the system processor is an I2C master to the IAM-20680HP.

Figure 6. IAM-20680HP Solution Using I2C Interface

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IAM-20680HP
IAM-20680HP Solution Using SPI Interface
In Figure 7, the system processor is an SPI master to the IAM-20680HP. Pins 2, 3, 4, and 5 are used to support the SPC, SDI, SDO, andCS signals for SPI communications.

Figure 7. IAM-20680HP Solution Using SPI Interface

SELF-TEST
Self-test allows for the testing of the mechanical and electrical portions of the sensors. The self-test for each measurement axis canbe activated by means of the gyroscope and accelerometer self-test registers (registers 27 and 28).
When the self-test is activated, the electronics cause the sensors to be actuated and produce an output signal. The output signal isused to observe the self-test response.
The self-test response is defined as follows:
SELF-TEST RESPONSE = SENSOR OUTPUT WITH SELF-TEST ENABLED – SENSOR OUTPUT WITH SELF-TEST DISABLED
When the value of the self-test response is within the specified min/max limits of the product specification, the part has passed selftest. When the self-test response exceeds the min/max values, the part is deemed to have failed self-test.

CLOCKING
The IAM-20680HP has a flexible clocking scheme, allowing a variety of internal clock sources to be used for the internal synchronous
circuitry. This synchronous circuitry includes the signal conditioning and ADCs, and various control circuits and registers. An on-chip
PLL provides flexibility in the allowable inputs for generating this clock.
Allowable internal sources for generating the internal clock are:a) An internal relaxation oscillatorb) Auto-select between internal relaxation oscillator and gyroscope MEMS oscillator to use the best available source
The only setting supporting specified performance in all modes is option b). It is recommended that option b) be used.

SENSOR DATA REGISTERS
The sensor data registers contain the latest gyroscope, accelerometer, and temperature measurement data. They are read-only
registers and are accessed via the serial interface. Data from these registers may be read anytime.

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IAM-20680HP
FIFO
The IAM-20680HP contains a 4096-byte FIFO register that is accessible via the Serial Interface. The FIFO configuration register
determines which data are written into the FIFO. Possible choices include gyro data, accelerometer data, temperature readings, andFSYNC input. A FIFO counter keeps track of how many bytes of valid data are contained in the FIFO. The FIFO register supports burst
reads. The interrupt function may be used to determine when new data are available.

INTERRUPTS
Interrupt functionality is configured via the Interrupt Configuration register. Items that are configurable include the INT pin
configuration, the interrupt latching and clearing method, and triggers for the interrupt. Items that can trigger an interrupt are newdata are available to be read (from the FIFO and Data registers) or FIFO overflow. The interrupt status can be read from the Interrupt
Status register.

DIGITAL-OUTPUT TEMPERATURE SENSOR
An on-chip temperature sensor and ADC are used to measure the IAM-20680HP die temperature. The readings from the ADC can beread from the FIFO or the Sensor Data registers.

BIAS AND LDOS
The bias and LDO section generates the internal supply and the reference voltages and currents required by the IAM-20680HP. Its
two inputs are an unregulated VDD and a VDDIO logic reference supply voltage. The LDO output is bypassed by a capacitor at
REGOUT. For further details on the capacitor, please refer to the Bill of Materials for External Components.

CHARGE PUMP
An on-chip charge pump generates the high voltage required for the MEMS oscillator.

STANDARD POWER MODES
Table 12 lists the user-accessible power modes for IAM-20680HP.
MODE
1
2
3
4
5
6

NAME
Sleep Mode
Standby Mode
Accelerometer Wake-on-Motion (WoM) Mode
Accelerometer Low-Noise Mode
Gyroscope Low-Noise Mode
6-Axis Low-Noise Mode

GYRO
Off
Drive On
Off
Off
On
On

ACCEL
Off
Off
Duty-Cycled
On
Off
On

Table 12. Standard Power Modes for IAM-20680HP
Notes:
1.

Power consumption for individual modes can be found in section 3.3.1.

SENSOR INITIALIZATION AND BASIC CONFIGURATIONThe basic configuration of the IAM-20680HP includes the following steps:• Power-up sequence• Sensor initialization and clock source selection• Digital interface access test
• Output data rate (i.e. sampling frequency) selection• Full scale range selection• Filter frequency selection• Power mode selection
Power-up sequence
When applying VDD, the power voltage ramp is detected and a power-on-reset sequence is triggered inside the component. During
this phase the device starts operating and internal logic levels are defined. For proper component initialization the power-up shouldbe performed with both CS and SCL/SPC low, ensuring that CS and SCL pins are not in an undetermined state during the VDD ramp. If
starting in I2C mode (CS at logic high), power-up should be performed with SCL/SPC low. Power-up with SCL/SPC high is not a
supported case and must be avoided.
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IAM-20680HP
It is worth noting that if the I/O pins (e.g. CS, SCL/SPC) are between V IL and VIH when the power-on-reset sequence is triggered, theirvalue is undetermined and the internal logic levels may not be properly defined. It should also be noted that VIL and VIH are related
to VDDIO and their value changes at power-up according to the applied VDDIO voltage ramp.
Power-up sequences that do not respect the conditions above may not lead to proper digital interface initialization. In this case apreliminary soft reset operation (PWR_MGMT_1 register set 0x81) must be performed to reset the digital interface, as soon as both
VDD and VDDIO are stable at their final voltage. Since the digital interface may not be properly initialized, the device may not provide
the acknowledge signal if the I2C protocol is used.
Sensor Initialization and Clock Source Selection
When power-up sequence is completed (as per section 4.18.1), a soft reset is required to initialize the sensor and let the IAM20680HP select the best clock source. The soft reset must be performed by setting the register PWR_MGMT_1 (address 0x6B) to
0x81 (see section 9.27), prior to registers initialization.
Soft reset must be performed as first operation after the power-up sequence to ensure the proper component registers setting.
Correct WHO_AM_I value is ensured only after the soft reset has been completed.
Digital interface access test
When soft reset is completed, make sure the component registers access can be done as expected. WHO_AM_I (address 0x75)
register can be used for this purpose to verify the identity of the device.
Output Data Rate Selection
To set the output data rate (ODR) to the desired frequency, select the sample rate divider by setting the register SMPLRT_DIV (address
0x19) to the desired value (see section 9.9). For instance, to set the output data rate to 100 Hz, write 0x09 into SMPLRT_DIV.
Full-Scale Range Selection
To set the full-scale range (FSR) of the accelerometer, set the register ACCEL_CONFIG (address 0x1C) to the desired value (seesection 9.12). For instance, to set the FSR of the accelerometer to 2g, write 0x00 into ACCEL_CONFIG.
To set the FSR of the gyroscope, set the register GYRO_CONFIG (address 0x1B) to the desired value (see section 9.11). For instance,
to set the FSR of the gyroscope to 250 dps, write 0x00 into GYRO_CONFIG.
Filter Selection
To set the corner frequency of the digital low-pass filter (DLPF) of the accelerometer, set the register ACCEL_CONFIG2 (address
0x1D) to the desired value (see section 9.13). For instance, to set the corner frequency of the DLPF of the accelerometer to 10.2 Hz,
write 0x05 into ACCEL_CONFIG2.
To set the corner frequency of the DLPF of the gyroscope, set the register CONFIG (address 0x1A) to the desired value (see section
9.10). For instance, to set the corner frequency of the DLPF of the gyroscope to 10 Hz, write 0x05 into CONFIG.
Power mode selection
To set desired power modes for IAM-20680HP (see section 4.17).

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IAM-20680HP
5 PROGRAMMABLE INTERRUPTS
The IAM-20680HP has a programmable interrupt system which can generate an interrupt signal on the INT pin. Status flags indicate
the source of an interrupt. Interrupt sources may be enabled and disabled individually.
INTERRUPT NAME
Motion Detection
FIFO Overflow
Data Ready

MODULE
Motion
FIFO
Sensor Registers

Table 13. Table of Interrupt Sources

WAKE-ON-MOTION INTERRUPTThe IAM-20680HP provides motion detection capability. A qualifying motion sample is one where the high passed sample from any
axis has an absolute value exceeding a user-programmable threshold. The following steps explain how to configure the Wake-onMotion Interrupt.
Step 1: Ensure that Accelerometer is running••In PWR_MGMT_1 register (0x6B) set CYCLE = 0, SLEEP = 0, and GYRO_STANDBY = 0
In PWR_MGMT_2 register (0x6C) set STBY_XA = STBY_YA = STBY_ZA = 0, and STBY_XG = STBY_YG = STBY_ZG = 1

Step 2: Accelerometer Configuration•

In ACCEL_CONFIG2 register (0x1D) set ACCEL_FCHOICE_B = 0 and A_DLPF_CFG[2:0] = 7 (b111)

Step 3: Enable Motion Interrupt•

In INT_ENABLE register (0x38) set WOM_INT_EN[2:0] = b111 to enable motion interrupt

Step 4: Set Motion Threshold•

Set the motion threshold in ACCEL_WOM_THR register (0x1F)

Step 5: Enable Accelerometer Hardware Intelligence•••

In ACCEL_INTEL_CTRL register (0x69) set ACCEL_INTEL_EN = 1 to enable the Wake-on-Motion detection logic
In ACCEL_INTEL_CTRL register (0x69):
o set ACCEL_INTEL_MODE = 0 to make the detection comparing the current sample to the first sample taken whenentering in low-power modeo set ACCEL_INTEL_MODE = 1 to make the detection insensitive to the acceleration DC-component
In ACCEL_INTEL_CTRL register (0x69) ensure that bit 0 is set to 0.

Step 6: Set Frequency of Wake-Up•

In LP_MODE_CFG register (0x1E) set ACCEL_WOM_ODR_CTRL[3:0] according to Table 19

Step 7: Enable Cycle Mode (Accelerometer Low-Power Mode)•In PWR_MGMT_1 register (0x6B) set ACCEL_CYCLE = 1

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IAM-20680HP
6 DIGITAL INTERFACEI2C AND SPI SERIAL INTERFACES
The internal registers and memory of the IAM-20680HP can be accessed using either I2C at 400 kHz or SPI at 8 MHz. SPI operates infour-wire mode.
PIN NUMBER
1

PIN NAME
VDDIOPIN DESCRIPTION
Digital I/O supply voltage.

4
2
3

SA0 / SDO
SCL / SPCSDA / SDII2C Slave Address LSB (SA0); SPI serial data output (SDO)
I2C serial clock (SCL); SPI serial clock (SPC)
I2C serial data (SDA); SPI serial data input (SDI)
Table 14. Serial Interface

Note: To prevent switching into I2C mode when using SPI, the I2C interface should be disabled by setting the I2C_IF_DIS configuration bit. Setting this bit should be
performed immediately after waiting for the time specified by the “Start-Up Time for Register Read/Write” in section 3.3.2.

For further information regarding the I2C_IF_DIS bit, please refer to sections 8 and 9 of this document.

I2C INTERFACEI2C is a two-wire interface comprised of the signals serial data (SDA) and serial clock (SCL). In general, the lines are open-drain and bidirectional. In a generalized I2C interface implementation, attached devices can be a master or a slave. The master device puts theslave address on the bus, and the slave device with the matching address acknowledges the master.
The IAM-20680HP always operates as a slave device when communicating to the system processor, which acts as the master. SDA
and SCL lines typically need pull-up resistors to VDD. The maximum bus speed is 400 kHz.
The slave address of the IAM-20680HP is b110100X which is 7 bits long. The LSB bit of the 7-bit address is determined by the logic
level on pin SA0. This allows two IAM-20680HPs to be connected to the same I2C bus. When used in this configuration, the addressof one of the devices should be b1101000 (pin SA0 is logic low) and the address of the other should be b1101001 (pin SA0 is logichigh).

IC COMMUNICATIONS PROTOCOLSTART (S) and STOP (P) Conditions
Communication on the I2C bus starts when the master puts the START condition (S) on the bus, which is defined as a HIGH-to-LOWtransition of the SDA line while SCL line is HIGH (see figure below). The bus is considered busy until the master puts a STOP condition(P) on the bus, which is defined as a LOW to HIGH transition on the SDA line while SCL is HIGH (see Figure 8).
Additionally, the bus remains busy if a repeated START (Sr) is generated instead of a STOP condition.

SDA

SCL
S

P

START condition

STOP condition

Figure 8. START and STOP Conditions

Data Format / Acknowledge
I2C data bytes are defined to be 8-bits long. There is no restriction to the number of bytes transmitted per data transfer. Each byte
transferred must be followed by an acknowledge (ACK) signal. The clock for the acknowledge signal is generated by the master,while the receiver generates the actual acknowledge signal by pulling down SDA and holding it low during the HIGH portion of theacknowledge clock pulse.
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IAM-20680HP
If a slave is busy and cannot transmit or receive another byte of data until some other task has been performed, it can hold SCL
LOW, thus forcing the master into a wait state. Normal data transfer resumes when the slave is ready, and releases the clock line(refer to Figure 9).

DATA OUTPUT BY
TRANSMITTER (SDA)
not acknowledge
DATA OUTPUT BYRECEIVER (SDA)
acknowledge
SCL FROM
MASTER

1

2

8

9

clock pulse for
acknowledgement

START
condition

Figure 9. Acknowledge on the I2C Bus

Communications
After beginning communications with the START condition (S), the master sends a 7-bit slave address followed by an 8th bit, theread/write bit. The read/write bit indicates whether the master is receiving data from or is writing to the slave device. Then, themaster releases the SDA line and waits for the acknowledge signal (ACK) from the slave device. Each byte transferred must be
followed by an acknowledge bit. To acknowledge, the slave device pulls the SDA line LOW and keeps it LOW for the high period of
the SCL line. Data transmission is always terminated by the master with a STOP condition (P), thus freeing the communications line.
However, the master can generate a repeated START condition (Sr), and address another slave without first generating a STOP
condition (P). A LOW to HIGH transition on the SDA line while SCL is HIGH defines the stop condition. All SDA changes should takeplace when SCL is low, with the exception of start and stop conditions.

SDA

SCL

1–7

8

9

1–7

8

9

1–7

8

9

S

P

START ADDRESS
condition

R/W

ACK

DATA

ACK

DATA

ACK

STOP
condition

Figure 10. Complete I2C Data Transfer

To write the internal IAM-20680HP registers, the master transmits the start condition (S), followed by the I 2C address and the write
bit (0). At the 9th clock cycle (when the clock is high), the IAM-20680HP acknowledges the transfer. Then the master puts the register
address (RA) on the bus. After the IAM-20680HP acknowledges the reception of the register address, the master puts the registerdata onto the bus. This is followed by the ACK signal, and data transfer may be concluded by the stop condition (P). To write multiple
bytes after the last ACK signal, the master can continue outputting data rather than transmitting a stop signal. In this case, the IAM20680HP automatically increments the register address and loads the data to the appropriate register. The following figures show
single and two-byte write sequences.
Single-Byte Write Sequence
Master

S

AD+W

Slave

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RA
ACK

DATA
ACK

P
ACK

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IAM-20680HP
Burst Write Sequence
Master

S

AD+W

RA

Slave

ACK

DATA

DATA

ACK

ACK

P
ACK

To read the internal IAM-20680HP registers, the master sends a start condition, followed by the I 2C address and a write bit, and thenthe register address that is going to be read. Upon receiving the ACK signal from the IAM-20680HP, the master transmits a startsignal followed by the slave address and read bit. As a result, the IAM-20680HP sends an ACK signal and the data. The
communication ends with a not acknowledge (NACK) signal and a stop bit from master. The NACK condition is defined such that the
SDA line remains high at the 9th clock cycle. The following figures show single and two-byte read sequences.
Single-Byte Read Sequence
Master

S

AD+W

Slave

RA
ACK

S

AD+R

ACK

NACK
ACK

DATA

ACK

DATA

P

Burst Read Sequence
Master

S

AD+W

Slave

RA
ACK

S
ACK

AD+R

ACK

NACK

P

DATA

I2C TERMS
SIGNAL
S
AD
W
R
ACK
NACK
RA
DATA
P

DESCRIPTION
Start Condition: SDA goes from high to low while SCL is highSlave I2C address
Write bit (0)Read bit (1)Acknowledge: SDA line is low while the SCL line is high at the 9th clock cycle
Not-Acknowledge: SDA line stays high at the 9th clock cycle
IAM-20680HP internal register address
Transmit or received data
Stop condition: SDA going from low to high while SCL is highTable 15. I2C Terms

Document Number: DS-000409
Revision: 1.2

Page 27 of 54

IAM-20680HP
SPI INTERFACESPI is a 4-wire synchronous serial interface that uses two control lines and two data lines. The IAM-20680HP always operates as a
Slave device during standard Master-Slave SPI operation.
With respect to the Master, the Serial Clock output (SPC), the Serial Data Output (SDO) and the Serial Data Input (SDI) are shared
among the Slave devices. Each SPI slave device requires its own Chip Select (CS) line from the master.
CS goes low (active) at the start of transmission and goes back high (inactive) at the end. Only one CS line is active at a time, ensuringthat only one slave is selected at any given time. The CS lines of the non-selected slave devices are held high, causing their SDO lines
to remain in a high-impedance (high-z) state so that they do not interfere with any active devices.
SPI Operational Features
1.
2.
3.
4.
5.

Data are delivered MSB first and LSB last
Data are latched on the rising edge of SPC
Data should be transitioned on the falling edge of SPC
The maximum frequency of SPC is 8 MHz
SPI read and write operations are completed in 16 or more clock cycles (two or more bytes). The first byte contains the
SPI Address, and the following byte(s) contain(s) the SPI data. The first bit of the first byte contains the Read/Write bit
and indicates the Read (1) or Write (0) operation. The following 7 bits contain the Register Address. In cases of multiplebyte Read/Writes, data are two or more bytes:
SPI Address format
MSB
R/W

A6

A5

A4

A3

A2

A1

LSB
A0

D6

D5

D4

D3

D2

D1

LSB
D0

SPI Data format
MSB
D7

6.

Supports Single or Burst Read/Writes.
SPC
SDI
SDO

SPI MasterCS1

SPI Slave 1

CS

CS2

SPC
SDI
SDO
CS

SPI Slave 2

Figure 11. Typical SPI Master/Slave Configuration

Document Number: DS-000409
Revision: 1.2

Page 28 of 54

IAM-20680HP
7 SERIAL INTERFACE CONSIDERATIONS
IAM-20680HP SUPPORTED INTERFACESThe IAM-20680HP supports I2C communications on its serial interface.
The IAM-20680HP’s I/O logic levels are set to be VDDIO.
Figure 12 depicts a sample circuit of IAM-20680HP. It shows the relevant logic levels and voltage connections.
VDDIO(0V - VDDIO)
VDD
VDDIO

VDD

INT

SDA
(0V - VDDIO)

VDDIO

SCL

SYSTEM BUS

VDD_IO

SystemProcessor IO(0V - VDDIO)(0V - VDDIO)(0V - VDDIO)

SYNC

IAM-20680HP
VDDIO(0V, VDDIO)

SA0

Figure 12. I/O Levels and Connections

Document Number: DS-000409
Revision: 1.2

Page 29 of 54

IAM-20680HP
8 REGISTER MAP
The following table lists the register map for the IAM-20680HP.
Addr
(Hex)

Addr
(Dec.)

Register Name

SerialI/F

Accessible(writable)
in Sleep
Mode

00

00

SELF_TEST_X_GYRO

R/WN

XG_ST_DATA[7:0]01

01

SELF_TEST_Y_GYRO

R/WN

YG_ST_DATA[7:0]02

02

SELF_TEST_Z_GYRO

R/WN

ZG_ST_DATA[7:0]0D

13SELF_TEST_X_ACCEL

R/W

N

XA_ST_DATA[7:0]0E

14

SELF_TEST_Y_ACCEL

R/W

N

YA_ST_DATA[7:0]0F

15

SELF_TEST_Z_ACCEL

R/W

N

ZA_ST_DATA[7:0]13

19

XG_OFFS_USRH

R/W

N

X_OFFS_USR [15:8]

14

20

XG_OFFS_USRL

R/WN

X_OFFS_USR [7:0]1521

YG_OFFS_USRH

R/W

N

Y_OFFS_USR [15:8]

16

22

YG_OFFS_USRL

R/WN

Y_OFFS_USR [7:0]1723

ZG_OFFS_USRH

R/W

N

Z_OFFS_USR [15:8]

18

24

ZG_OFFS_USRL

R/WN

Z_OFFS_USR [7:0]1925

SMPLRT_DIV

R/W

N

1A

26

1B
1C

N

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

SMPLRT_DIV[7:0]
-

FIFO_
MODE

N

XG_ST

YG_ST

ZG_ST

FS_SEL [1:0]

N

XA_ST

YA_ST

ZA_ST

ACCEL_FS_SEL[1:0]

CONFIG

R/W

EXT_SYNC_SET[2:0]27

GYRO_CONFIG

R/W

28

ACCEL_CONFIG

R/W

1D

29

ACCEL_CONFIG 2

R/W

N

1E

30

LP_MODE_CFG

R/W

N

1F

31

ACCEL_WOM_THR

R/W

23

35

FIFO_EN

R/W

N

TEMP
_FIFO_EN

XG_FIFO_EN

YG_FIFO_EN

ZG_FIFO_EN

ACCEL_FIFO_
EN

36

54

FSYNC_INT

R/CN

FSYNC_INT---FIFO_SIZE[1:0]-

FCHOICE_B[1:0]-

ACCEL_FCHOI
CE_B

DEC2_CFG[1:0]

GYRO_CYCLE

DLPF_CFG[2:0]

A_DLPF_CFG[2:0]

G_AVGCFG[2:0]

ACCEL_WOM_ODR_CTRL[3:0]

N

WOM_THR[7:0]

INT_OPEN

LATCH_INT_EN

-

-

-

-

-

-

INT_RD_CLEARFSYNC_INT_L
EVEL

FSYNC
_INT_MODE_
EN

-

-

37

55

INT_PIN_CFG

R/W

Y

38

56

INT_ENABLE

R/W

Y

WOM_INT_EN[2:0]

FIFO_OFLOW_EN-GDRIVE_INT_EN-

DATA_RDY_I
NT_EN

3A

58

INT_STATUS

R/C

N

WOM_INT[2:0]

FIFO_OFLOW_INT-GDRIVE_INT-

DATA_RDY_INT

3B

59

ACCEL_XOUT_H

R

N

3C

60

ACCEL_XOUT_L

R

N

ACCEL_XOUT_L[7:0]3D

61

ACCEL_YOUT_H

R

N

ACCEL_YOUT_H[15:8]

3E

62

ACCEL_YOUT_L

R

N

ACCEL_YOUT_L[7:0]3F

63

ACCEL_ZOUT_H

R

N

ACCEL_ZOUT_H[15:8]

40

64

ACCEL_ZOUT_L

R

N

ACCEL_ZOUT_L[7:0]4165TEMP_OUT_H

R

N

TEMP_OUT[15:8]

42

66

TEMP_OUT_L

R

N

TEMP_OUT[7:0]4367GYRO_XOUT_H

R

N

GYRO_XOUT[15:8]

44

68

GYRO_XOUT_L

R

N

GYRO_XOUT[7:0]4569

GYRO_YOUT_H

R

N

GYRO_YOUT[15:8]

4670

GYRO_YOUT_L

R

N

GYRO_YOUT[7:0]4771

GYRO_ZOUT_H

R

N

GYRO_ZOUT[15:8]

48

72

GYRO_ZOUT_L

R

N

GYRO_ZOUT[7:0]

68

104

SIGNAL_PATH_RESET

R/W

N

-

-

-

ACCEL
_RST

TEMP
_RST

69

105

ACCEL_INTEL_CTRL

R/WN

ACCEL_INTE
L_EN

ACCEL_INTEL
_MODE

6A

106

USER_CTRL

R/W

N

-

FIFO_EN

FIFO
_RST

-

SIG_COND_RST

Document Number: DS-000409
Revision: 1.2

INT_LEVEL-ACCEL_XOUT_H[15:8]

-

-

-

-

I2C_IF_DIS-

Page 30 of 54

IAM-20680HP
Addr
(Hex)

Addr
(Dec.)

Register Name

SerialI/F

Accessible(writable)
in Sleep
Mode

Bit7

Bit6

Bit5

Bit4

Bit3

6B

107

PWR_MGMT_1

R/W

Y

DEVICE_RES
ET

SLEEP

ACCEL_CYCLEGYRO_STANDBY

TEMP_DIS

6C

108

PWR_MGMT_2

R/W

Y

FIFO_LP_EN-

STBY_XASTBY_YASTBY_ZA

72

114

FIFO_COUNTH

R

N

73

115

FIFO_COUNTLRNFIFO_COUNT[7:0]

74

116

FIFO_R_W

R/W

N

FIFO_DATA[7:0]

75

117

WHO_AM_I

R

N

WHOAMI[7:0]

77

119

XA_OFFSET_H

R/W

N

XA_OFFS [14:7]

78

120

XA_OFFSET_L

R/W

N

7A

122

YA_OFFSET_H

R/W

N

7B

123

YA_OFFSET_L

R/W

N

7D

125

ZA_OFFSET_H

R/W

N

7E

126

ZA_OFFSET_L

R/W

N

-

Bit2

Bit1

Bit0

CLKSEL[2:0]
STBY_XG

STBY_YG

STBY_ZG

FIFO_COUNT[12:8]

XA_OFFS [6:0]-

YA_OFFS [14:7]
YA_OFFS [6:0]-

ZA_OFFS [14:7]
ZA_OFFS [6:0]-

Table 16. Register Map
Note: Register Names ending in _H and _L contain the high and low bytes, respectively, of an internal register value.

In the detailed register tables that follow, register names are in capital letters, while register values are in capital letters anditalicized. For example, the ACCEL_XOUT_H register (Register 59) contains the 8 most significant bits, ACCEL_XOUT[15:8], of the 16bit X-Axis accelerometer measurement, ACCEL_XOUT.
The reset value is 0x00 for all registers other than the registers below:••••

Self-test registers 0, 1, 2, 13, 14, 15 contain pre-programmed values
Register 107, PWR_MGMT_1
Register 117, WHO_AM_I: (default value is reported in section 9.31)
Registers 119, 120, 122, 123, 125, 126 contain pre-programmed offset cancellation values

Document Number: DS-000409
Revision: 1.2

Page 31 of 54

IAM-20680HP
9 REGISTER DESCRIPTIONSThis section describes the function and contents of each register within the IAM-20680HP.

REGISTERS 0 TO 2 – GYROSCOPE SELF-TEST REGISTERS
Register Name: SELF_TEST_X_GYRO, SELF_TEST_Y_GYRO, SELF_TEST_Z_GYRO
Type: READ/WRITE
Register Address: 00, 01, 02 (Decimal); 00, 01, 02 (Hex)REGISTER

BIT

NAME

SELF_TEST_X_GYRO[7:0]

XG_ST_DATA[7:0]

SELF_TEST_Y_GYRO[7:0]

YG_ST_DATA[7:0]

SELF_TEST_Z_GYRO[7:0]

ZG_ST_DATA[7:0]

FUNCTION
The value in this register indicates the self-test output generated during
manufacturing tests. This value is to be used to check against
subsequent self-test outputs performed by the end user.
The value in this register indicates the self-test output generated during
manufacturing tests. This value is to be used to check against
subsequent self-test outputs performed by the end user.
The value in this register indicates the self-test output generated during
manufacturing tests. This value is to be used to check against
subsequent self-test outputs performed by the end user.

The equation to convert self-test codes in OTP to factory self-test measurement is:

ST _ OTP = ( 2620 / 2 FS ) * 1.01( ST _ code−1) (lsb)
where ST_OTP is the value that is stored in OTP of the device, FS is the Full Scale value, and ST_code is based on the Self-Test value(ST_ FAC) determined in InvenSense’s factory final test and calculated based on the following equation:

ST _ code = round (log( ST _ FAC /( 2620 / 2 FS ))) +1
log(1.01)

REGISTERS 13 TO 15 – ACCELEROMETER SELF-TEST REGISTERS
Register Name: SELF_TEST_X_ACCEL, SELF_TEST_Y_ACCEL, SELF_TEST_Z_ACCEL
Type: READ/WRITE
Register Address: 13, 14, 15 (Decimal); 0D, 0E, 0F (Hex)REGISTER

BITS

NAME

SELF_TEST_X_ACCEL[7:0]

XA_ST_DATA[7:0]

SELF_TEST_Y_ACCEL[7:0]

YA_ST_DATA[7:0]

SELF_TEST_Z_ACCEL[7:0]

ZA_ST_DATA[7:0]

FUNCTION
The value in this register indicates the self-test output generated
during manufacturing tests. This value is to be used to check against
subsequent self-test outputs performed by the end user.
The value in this register indicates the self-test output generated
during manufacturing tests. This value is to be used to check against
subsequent self-test outputs performed by the end user.
The value in this register indicates the self-test output generated
during manufacturing tests. This value is to be used to check against
subsequent self-test outputs performed by the end user.

The equation to convert self-test codes in OTP to factory self-test measurement is:

ST _ OTP = ( 2620 / 2 FS ) * 1.01( ST _ code−1) (lsb)
where ST_OTP is the value that is stored in OTP of the device, FS is the Full Scale value, and ST_code is based on the Self-Test value(ST_ FAC) determined in InvenSense’s factory final test and calculated based on the following equation:

ST _ code = round (Document Number: DS-000409
Revision: 1.2log( ST _ FAC /( 2620 / 2 FS ))) +1
log(1.01)

Page 32 of 54

IAM-20680HP
REGISTER 19 – GYRO OFFSET ADJUSTMENT REGISTER
Register Name: XG_OFFS_USRH
Register Type: READ/WRITE
Register Address: 19 (Decimal); 13 (Hex)
BIT
[7:0]

NAME
X_OFFS_USR[15:8]

FUNCTION
Bits 15 to 8 of the 16-bit offset of X gyroscope (2’s complement). This register isused to remove DC bias from the sensor output. The value in this register isadded to the gyroscope sensor value before going into the sensor register.

REGISTER 20 – GYRO OFFSET ADJUSTMENT REGISTER
Register Name: XG_OFFS_USRLRegister Type: READ/WRITE
Register Address: 20 (Decimal); 14 (Hex)
BIT

NAME

[7:0]

X_OFFS_USR[7:0]

FUNCTION
Bits 7 to 0 of the 16-bit offset of X gyroscope (2’s complement). This register isused to remove DC bias from the sensor output. The value in this register isadded to the gyroscope sensor value before going into the sensor register.

REGISTER 21 – GYRO OFFSET ADJUSTMENT REGISTER
Register Name: YG_OFFS_USRH
Register Type: READ/WRITE
Register Address: 21 (Decimal); 15 (Hex)
BIT
[7:0]

NAME
Y_OFFS_USR[15:8]

FUNCTION
Bits 15 to 8 of the 16-bit offset of Y gyroscope (2’s complement). This register isused to remove DC bias from the sensor output. The value in this register isadded to the gyroscope sensor value before going into the sensor register.

REGISTER 22 – GYRO OFFSET ADJUSTMENT REGISTER
Register Name: YG_OFFS_USRLRegister Type: READ/WRITE
Register Address: 22 (Decimal); 16 (Hex)
BIT

NAME

[7:0]

Y_OFFS_USR[7:0]

Document Number: DS-000409
Revision: 1.2

FUNCTION
Bits 7 to 0 of the 16-bit offset of Y gyroscope (2’s complement). This register isused to remove DC bias from the sensor output. The value in this register isadded to the gyroscope sensor value before going into the sensor register.

Page 33 of 54

IAM-20680HP
REGISTER 23 – GYRO OFFSET ADJUSTMENT REGISTER
Register Name: ZG_OFFS_USRH
Register Type: READ/WRITE
Register Address: 23 (Decimal); 17 (Hex)
BIT
[7:0]

NAME

FUNCTION
Bits 15 to 8 of the 16-bit offset of Z gyroscope (2’s complement). This register isused to remove DC bias from the sensor output. The value in this register isadded to the gyroscope sensor value before going into the sensor register.

Z_OFFS_USR[15:8]

REGISTER 24 – GYRO OFFSET ADJUSTMENT REGISTER
Register Name: ZG_OFFS_USRLRegister Type: READ/WRITE
Register Address: 24 (Decimal); 18 (Hex)
BIT

NAME

[7:0]

Z_OFFS_USR[7:0]

FUNCTION
Bits 7 to 0 of the 16-bit offset of Z gyroscope (2’s complement). This register isused to remove DC bias from the sensor output. The value in this register isadded to the gyroscope sensor value before going into the sensor register.

REGISTER 25 – SAMPLE RATE DIVIDER
Register Name: SMPLRT_DIV
Register Type: READ/WRITE
Register Address: 25 (Decimal); 19 (Hex)
BIT
[7:0]

NAME
SMPLRT_DIV[7:0]

FUNCTION
Divides the internal sample rate (see register CONFIG) to generate the sample rate that
controls sensor data output rate, FIFO sample rate.
Note: This register is only effective when FCHOICE_B register bits are 2’b00, and (0 < DLPF_CFG < 7).

This is the update rate of the sensor register:
SAMPLE_RATE = INTERNAL_SAMPLE_RATE / (1 + SMPLRT_DIV)
Where INTERNAL_SAMPLE_RATE = 1 kHz

REGISTER 26 – CONFIGURATION
Register Name: CONFIG
Register Type: READ/WRITE
Register Address: 26 (Decimal); 1A (Hex)
BIT
[7]
[6]

NAME
FIFO_MODE[5:3]

EXT_SYNC_SET[2:0]

FUNCTION
Always set to 0
When set to ‘1’, when the FIFO is full, additional writes will not be written to FIFO.
When set to ‘0’, when the FIFO is full, additional writes will be written to the FIFO, replacing
the oldest data.
Enables the FSYNC pin data to be sampled.
EXT_SYNC_SET
0
1
2
3
4
5
6
7

[2:0]

DLPF_CFG[2:0]Document Number: DS-000409
Revision: 1.2

FSYNC bit location
function disabled
TEMP_OUT_L[0]GYRO_XOUT_L[0]GYRO_YOUT_L[0]GYRO_ZOUT_L[0]ACCEL_XOUT_L[0]ACCEL_YOUT_L[0]ACCEL_ZOUT_L[0]FSYNC will be latched to capture short strobes. This will be done such that if FSYNC toggles,
the latched value toggles, but won’t toggle again until the new latched value is captured by
the sample rate strobe.
For the DLPF to be used, FCHOICE_B[1:0] is 2’b00.
See Table 17.

Page 34 of 54

IAM-20680HP
The DLPF is configured by DLPF_CFG, when FCHOICE_B [1:0] = 2b’00. The gyroscope and temperature sensor are filtered according
to the value of DLPF_CFG and FCHOICE_B as shown in Table 17.
FCHOICE_B

Temperature
SensorGyroscope
DLPF_CFG

<1>

<0>

X
1
0
0
0
0
0
0
0
0

1
0
0
0
0
0
0
0
0
0

X
X
0
1
2
3
4
5
6
7

3-dB BW(Hz)

Noise BW
(Hz)

Rate
(kHz)

8173
3281
250
176
92
41
20
10
5
3281

8595.132

3451.0
306.6
177.0
108.6
59.0
30.5
15.6
8.0
3451.0

32
8
1
1
1
1
1
1
8

3-dB BW (Hz)
4000
4000
4000
188
98
42
20
10
5
4000

Table 17. Configuration

REGISTER 27 – GYROSCOPE CONFIGURATION
Register Name: GYRO_CONFIG
Register Type: READ/WRITE
Register Address: 27 (Decimal); 1B (Hex)
BIT
[7]
[6]
[5]

XG_ST
YG_ST
ZG_ST

NAME

[4:3]

FS_SEL[1:0]

[2]
[1:0]

FCHOICE_B[1:0]

FUNCTIONX Gyro self-test
Y Gyro self-test
Z Gyro self-test
Gyro Full Scale Select:
00 = ±250 dps
01= ±500 dps
10 = ±1000 dps
11 = ±2000 dps
Reserved
Used to bypass DLPF as shown in Table 17 above.

REGISTER 28 – ACCELEROMETER CONFIGURATION
Register Name: ACCEL_CONFIG
Register Type: READ/WRITE
Register Address: 28 (Decimal); 1C (Hex)
BIT
[7]
[6]
[5]

XA_ST
YA_ST
ZA_ST

NAME

[4:3]

ACCEL_FS_SEL[1:0]

[2:0]

-

Document Number: DS-000409
Revision: 1.2

FUNCTION
X Accel self-test
Y Accel self-test
Z Accel self-test
Accel Full Scale Select:±2g (00), ±4g (01), ±8g (10), ±16g (11)Reserved

Page 35 of 54

IAM-20680HP
REGISTER 29 – ACCELEROMETER CONFIGURATION 2
Register Name: ACCEL_CONFIG2
Register Type: READ/WRITE
Register Address: 29 (Decimal); 1D (Hex)
BIT

NAME

[7:6]

FIFO_SIZE[1:0][5:4]

DEC2_CFG[1:0]

[3]
[2:0]

ACCEL_FCHOICE_B
A_DLPF_CFG

FUNCTION
Specifies FIFO size according to the following:
0 = 512 Byte
1 = 1 kByte
2 = 2 kByte
3 = 4 kByte
Averaging filter settings for Low Power Accelerometer mode:
0 = Average 4 samples
1 = Average 8 samples
2 = Average 16 samples
3 = Average 32 samples
Used to bypass DLPF as shown in the table below.
Accelerometer low pass filter setting as shown in the table below.
Accelerometer
ACCEL_FCHOICE_B

A_DLPF_CFG

3-dB BW(Hz)

Noise BW
(Hz)

Rate
(kHz)

1
0
0
0
0
0
0
0
0

X
0
1
2
3
4
5
6
7

1046.0
218.1
218.1
99.0
44.8
21.2
10.2
5.1
420.0

1100.0
235.0
235.0
121.3
61.5
31.0
15.5
7.8
441.6

4
1
1
1
1
1
1
1
1

Table 18. Accelerometer Data Rates and Bandwidths (Low Noise Mode)

The data output rate of the DLPF filter block can be further reduced by a factor of 1/(1+SMPLRT_DIV), where SMPLRT_DIV is an 8-bit
integer. Following is a small subset of ODRs that are configurable for the accelerometer in the low-noise mode in this manner (Hz):3.91, 7.81, 15.63, 31.25, 62.50, 125, 250, 500, 1K.
The Table 19 lists the accelerometer filter bandwidths, noise, and current consumption available in the low-power mode ofoperation (WoM). In the low-power mode of operation, the accelerometer is duty-cycled.
To operate in accelerometer low-power mode, ACCEL_CYCLE should be set to ‘1’ in PWR_MGMT_1 (address 0x6B).

Document Number: DS-000409
Revision: 1.2

Page 36 of 54

IAM-20680HP
ACCEL_FCHOICE_B
A_DLPF_CFG
DEC2_CFG
AveragesTon (ms)
Noise BW (Hz)Noise (mg-rms) TYP1ACCEL_WOM_ODR_CTRL ODR (Hz)
4
3.9
5
7.8
6
15.6
7
31.3
8
62.5
9
125.0
10
250.0
11
500.0

1
x
x
1x
1.084
1100.0
6.6
8.4
9.8
12.8
18.7
30.4
57.4
100.9
194.9

0
0
0
7
7
7
0
1
2
4x
8x
16x
1.84
2.84
4.84
441.6
235.4
121.3
4.2
3.1
2.2
Current Consumption (µA) TYP1
9.4
10.8
13.6
11.9
14.7
20.3
17.0
22.5
33.7
27.1
38.2
60.4
47.2
69.4
113.9
87.5
132.0
220.9
168.1
257.0
N/A
329.3
N/A

0
7
3
32x
8.84
61.5
1.6
19.2
31.4
55.9
104.9
202.8
N/A

Table 19. Accelerometer Filter Bandwidths, Noise, and Current Consumption (Low-Power Mode)
Notes:

1.

Not tested in production, not guaranteed

REGISTER 30 – LOW POWER MODE CONFIGURATION
Register Name: LP_MODE_CFG
Register Type: READ/WRITE
Register Address: 30 (Decimal); 1E (Hex)
BIT

NAME

[7]

GYRO_CYCLE[6:4]

G_AVGCFG[2:0][3:0]ACCEL_WOM_ODR_CTRL[3:0]

FUNCTION
When set to ‘1’ low-power gyroscope mode is enabled.
Default setting is ‘0’
Averaging filter configuration for low-power gyroscopemode. Default setting is ‘000’
Accelerometer WoM Mode ODR configuration.
ACCEL_WOM_ODR_CTRL is effective only when GYRO is off
and ACCEL_CYCLE is set to ‘1’:
0 to 3 = RESERVED
4 = 3.9 Hz
5 = 7.8 Hz
6 = 15.6 Hz
7 = 31.3 Hz
8 = 62.5 Hz
9 = 125 Hz
10 = 250 Hz
11 = 500 Hz
12 to 15 = RESERVED.

To reduce gyroscope or 6-axis power consumption, GYRO_CYCLE should be set to ‘1'. When GYRO_CYCLE is set to '1' gyroscope isduty-cycled and performance are reduced compared to Low-Noise mode. When GYRO_CYCLE is set to '1' gyroscope filter
configuration is determined by G_AVGCFG[2:0] that sets the averaging filter configuration, gyroscope filter is not dependent on
DLPF_CFG[2:0]. Table 20 shows some example configurations when GYRO_CYCLE is set to '1'.

Document Number: DS-000409
Revision: 1.2

Page 37 of 54

IAM-20680HP
FCHOICE_B
G_AVGCFG
AveragesTon (ms)
Noise BW (Hz)Noise (dps-rms) TYP1SMPLRT_DIVODR (Hz)
255
3.9
99
10.0
64
15.4
32
30.3
19
50.0
9
100.0
7
125.0
4
200.0
3
250.0
2
333.3
1
500.0

0
0
1x
1.73
650.8
0.20

0
1
2x
2.23
407.1
0.16

1.3
1.3
1.4
1.4
1.5
1.6
1.7
1.9
2.1
2.3
2.9

1.3
1.3
1.4
1.4
1.5
1.7
1.8
2.1
2.3
2.6

0
2
4x
3.23
224.2
0.12

0
0
0
0
0
3
4
5
6
7
8x
16x
32x
64x
128x
5.23
9.23
17.23
33.23
65.23
117.4
60.2
30.6
15.6
8.0
0.09
0.06
0.04
0.03
0.02
Current Consumption (mA) TYP1
1.3
1.3
1.4
1.4
1.5
1.8
1.4
1.4
1.5
1.6
1.9
2.5
1.4
1.5
1.6
1.8
2.2
N/A
1.5
1.6
1.8
2.2
N/A
1.6
1.8
2.1
2.8
1.9
2.2
3.0
N/A
2.0
2.5
N/A
2.5
N/A
2.7
N/A
N/A

Table 20. Example Configurations for Gyroscope Low-Power Mode
Notes:

1.

Not tested in production, not guaranteed

REGISTER 31 – WAKE-ON MOTION THRESHOLD (ACCELEROMETER)
Register Name: ACCEL_WOM_THR
Register Type: READ/WRITE
Register Address: 31 (Decimal); 1F (Hex)
BIT

NAME

[7:0]

WOM_THR[7:0]

Document Number: DS-000409
Revision: 1.2

FUNCTION
This register holds the threshold value for the Wake on Motion Interrupt for accelerometer.
Wake on motion threshold resolution is 4 mg/LSB regardless the selected full scale.

Page 38 of 54

IAM-20680HP
REGISTER 35 – FIFO ENABLE
Register Name: FIFO_EN
Register Type: READ/WRITE
Register Address: 35 (Decimal); 23 (Hex)
BIT

NAME

[7]

TEMP_FIFO_EN[6]

XG_FIFO_EN[5]

YG_FIFO_EN

FUNCTION
1 – Write TEMP_OUT_H and TEMP_OUT_L to the FIFO at the sample rate; If enabled,buffering of data occurs even if data path is in standby.
0 – Function is disabled.
1 – Write GYRO_XOUT_H and GYRO_XOUT_L to the FIFO at the sample rate; If enabled,buffering of data occurs even if data path is in standby.
0 – Function is disabled.
1 – Write GYRO_YOUT_H and GYRO_YOUT_L to the FIFO at the sample rate; If enabled,buffering of data occurs even if data path is in standby.
0 – Function is disabled.
Note: Enabling any one of the bits corresponding to the Gyros or Temp data paths, data are buffered into
the FIFO even though that data path is not enabled.

[4]

ZG_FIFO_EN[3]

ACCEL_FIFO_EN

[2:0]

-

1 – Write GYRO_ZOUT_H and GYRO_ZOUT_L to the FIFO at the sample rate; If enabled,buffering of data occurs even if data path is in standby.
0 – Function is disabled
1 – Write ACCEL_XOUT_H, ACCEL_XOUT_L, ACCEL_YOUT_H, ACCEL_YOUT_L, ACCEL_ZOUT_H,
and ACCEL_ZOUT_L to the FIFO at the sample rate;
0 – Function is disabled.
Reserved.

REGISTER 54 – FSYNC INTERRUPT STATUS
Register Name: FSYNC_INTRegister Type: READ to CLEAR
Register Address: 54 (Decimal); 36 (Hex)
BIT
[7]

NAME
FSYNC_INTFUNCTION
This bit automatically sets to 1 when a FSYNC interrupt has been generated. The bit
clears to 0 after the register has been read.

REGISTER 55 – INT PIN / BYPASS ENABLE CONFIGURATION
Register Name: INT_PIN_CFG
Register Type: READ/WRITE
Register Address: 55 (Decimal); 37 (Hex)
BIT

NAME

[7]

INT_LEVEL[6]

INT_OPEN[5]LATCH_INT_EN[4]

INT_RD_CLEAR[3]FSYNC_INT_LEVEL[2]

FSYNC_INT_MODE_EN

[1]
[0]

-

Document Number: DS-000409
Revision: 1.2

FUNCTION
1 – The logic level for INT pin is active low.
0 – The logic level for INT pin is active high.
1 – INT pin is configured as open drain.
0 – INT pin is configured as push-pull.
1 – INT pin level held until interrupt status is cleared.
0 – INT pin indicates interrupt pulse’s width is 50 µs.
1 – Interrupt status is cleared if any read operation is performed.
0 – Interrupt status is cleared only by reading INT_STATUS register
1 – The logic level for the FSYNC pin as an interrupt is active low.
0 – The logic level for the FSYNC pin as an interrupt is active high.
When this bit is equal to 1, the FSYNC pin will trigger an interrupt when it transitions to
the level specified by FSYNC_INT_LEVEL. When this bit is equal to 0, the FSYNC pin isdisabled from causing an interrupt.
Reserved.
Always set to 0.

Page 39 of 54

IAM-20680HP
REGISTER 56 – INTERRUPT ENABLE
Register Name: INT_ENABLE
Register Type: READ/WRITE
Register Address: 56 (Decimal); 38 (Hex)
BIT

NAME

[7:5]

WOM_INT_EN[2:0][4]

FIFO_OFLOW_EN

[3]
[2]
[1]
[0]

GDRIVE_INT_EN
DATA_RDY_INT_EN

FUNCTION
111 – Enable WoM interrupt on accelerometer.
000 – Disable WoM interrupt on accelerometer.
1 – Enables a FIFO buffer overflow to generate an interrupt.
0 – Function is disabled.
Reserved.
Gyroscope Drive System Ready interrupt enable.
Reserved.
Data ready interrupt enable.

REGISTER 58 – INTERRUPT STATUS
Register Name: INT_STATUS
Register Type: READ to CLEAR
Register Address: 58 (Decimal); 3A (Hex)
BIT

NAME

[7:5]

WOM_INT[2:0][4]

FIFO_OFLOW_INT

[3]
[2]
[1]

GDRIVE_INT-[0]

DATA_RDY_INT

FUNCTION
Accelerometer WoM interrupt status. Cleared on Read.
111 – WoM interrupt on accelerometer
This bit automatically sets to 1 when a FIFO buffer overflow has been generated. The bit
clears to 0 after the register has been read.
Reserved.
Gyroscope Drive System Ready interrupt
Reserved.
This bit automatically sets to 1 when a Data Ready interrupt is generated. The bit clears
to 0 after the register has been read.

REGISTERS 59 TO 64 – ACCELEROMETER MEASUREMENTS
Register Name: ACCEL_XOUT_H
Register Type: READ only
Register Address: 59 (Decimal); 3B (Hex)
BIT
[7:0]

NAME
ACCEL_XOUT_H[15:8]

FUNCTION
High byte of accelerometer x-axis data.

Register Name: ACCEL_XOUT_L
Register Type: READ only
Register Address: 60 (Decimal); 3C (Hex)
BIT
[7:0]

NAME
ACCEL_XOUT_L[7:0]

FUNCTION
Low byte of accelerometer x-axis data.

Register Name: ACCEL_YOUT_H
Register Type: READ only
Register Address: 61 (Decimal); 3D (Hex)
BIT
[7:0]

NAME
ACCEL_YOUT_H[15:8]

Document Number: DS-000409
Revision: 1.2

FUNCTION
High byte of accelerometer y-axis data.

Page 40 of 54

IAM-20680HP
Register Name: ACCEL_YOUT_L
Register Type: READ only
Register Address: 62 (Decimal); 3E (Hex)
BIT
[7:0]

NAME
ACCEL_YOUT_L[7:0]

FUNCTION
Low byte of accelerometer y-axis data.

Register Name: ACCEL_ZOUT_H
Register Type: READ only
Register Address: 63 (Decimal); 3F (Hex)
BIT
[7:0]

NAME
ACCEL_ZOUT_H[15:8]

FUNCTION
High byte of accelerometer z-axis data.

Register Name: ACCEL_ZOUT_L
Register Type: READ only
Register Address: 64 (Decimal); 40 (Hex)
BIT
[7:0]

NAME
ACCEL_ZOUT_L[7:0]

FUNCTION
Low byte of accelerometer z-axis data.

REGISTERS 65 AND 66 – TEMPERATURE MEASUREMENT
Register Name: TEMP_OUT_H
Register Type: READ only
Register Address: 65 (Decimal); 41 (Hex)
BIT
[7:0]

NAME
TEMP_OUT[15:8]

FUNCTION
High byte of the temperature sensor output.

Register Name: TEMP_OUT_L
Register Type: READ only
Register Address: 66 (Decimal); 42 (Hex)
BIT

NAME

[7:0]

TEMP_OUT[7:0]

FUNCTION
Low byte of the temperature sensor output
TEMP_degC= ((TEMP_OUT –RoomTemp_Offset)/Temp_Sensitivity) + 25degC

REGISTERS 67 TO 72 – GYROSCOPE MEASUREMENTS
Register Name: GYRO_XOUT_H
Register Type: READ only
Register Address: 67 (Decimal); 43 (Hex)
BIT
[7:0]

NAME
GYRO_XOUT[15:8]

FUNCTION
High byte of the X-Axis gyroscope output.

Register Name: GYRO_XOUT_L
Register Type: READ only
Register Address: 68 (Decimal); 44 (Hex)
BIT

NAME

[7:0]

GYRO_XOUT[7:0]

Document Number: DS-000409
Revision: 1.2

FUNCTION
Low byte of the X-Axis gyroscope output.
GYRO_XOUT =NominalConditions

Gyro_Sensitivity * X_angular_rate
FS_SEL = 0
Gyro_Sensitivity = 131 LSB/(dps)Page 41 of 54

IAM-20680HP
Register Name: GYRO_YOUT_H
Register Type: READ only
Register Address: 69 (Decimal); 45 (Hex)
BIT
[7:0]

NAME
GYRO_YOUT[15:8]

FUNCTION
High byte of the Y-Axis gyroscope output.

Register Name: GYRO_YOUT_L
Register Type: READ only
Register Address: 70 (Decimal); 46 (Hex)
BIT

NAME

[7:0]

GYRO_YOUT[7:0]

FUNCTION
Low byte of the Y-Axis gyroscope output.
GYRO_YOUT =NominalConditions

Gyro_Sensitivity * Y_angular_rate
FS_SEL = 0
Gyro_Sensitivity = 131 LSB/(dps)Register Name: GYRO_ZOUT_H
Register Type: READ only
Register Address: 71 (Decimal); 47 (Hex)
BIT

NAME

[7:0]

GYRO_ZOUT[15:8]

FUNCTION
High byte of the Z-Axis gyroscope output.

Register Name: GYRO_ZOUT_L
Register Type: READ only
Register Address: 72 (Decimal); 48 (Hex)
BIT

NAME

[7:0]

GYRO_ZOUT[7:0]

FUNCTION
Low byte of the Z-Axis gyroscope output.
GYRO_ZOUT =Gyro_Sensitivity * Z_angular_rate

NominalConditions

FS_SEL = 0
Gyro_Sensitivity = 131 LSB/(dps)

REGISTER 104 – SIGNAL PATH RESETRegister Name: SIGNAL_PATH_RESETRegister Type: READ/WRITE
Register Address: 104 (Decimal); 68 (Hex)
BIT
[7:2]

NAME

-

[1]

ACCEL_RST[0]

TEMP_RSTFUNCTION
Reserved.
Reset accel digital signal path.
Note: Sensor registers are not cleared. Use SIG_COND_RST to clear sensor registers.

Reset temp digital signal path.
Note: Sensor registers are not cleared. Use SIG_COND_RST to clear sensor registers.

REGISTER 105 – ACCELEROMETER INTELLIGENCE CONTROL
Register Name: ACCEL_INTEL_CTRL
Register Type: READ/WRITE
Register Address: 105 (Decimal); 69 (Hex)
BIT
[7]

NAME
ACCEL_INTEL_EN[6]

ACCEL_INTEL_MODE

[5:1]

-

[0]

-

Document Number: DS-000409
Revision: 1.2

FUNCTION
This bit enables the Wake-on-Motion detection logic.
0 – Compares the current sample to the first sample taken when entering in
low-power mode.
1 – Compare the current sample with the previous sample.
Reserved.
Reserved.
Must be set to 0 when WOM is activated. Please refer to section 5.1

Page 42 of 54

IAM-20680HP
REGISTER 106 – USER CONTROL
Register Name: USER_CTRL
Register Type: READ/WRITE
Register Address: 106 (Decimal); 6A (Hex)
BIT
[7]

-

NAME

[6]

FIFO_EN

[5]
[4]
[3]

I2C_IF_DIS[2]

FIFO_RST

[1]

-

[0]

SIG_COND_RST-

FUNCTION
Reserved.
1 – Enable FIFO operation mode.
0 – Disable FIFO access from serial interface. To disable FIFO writes by DMA, use FIFO_EN
register.
Reserved.
1 – Disable I2C Slave module and put the serial interface in SPI mode only.
Reserved.
1 – Reset FIFO module. Reset is asynchronous. This bit auto clears after one clock cycle of theinternal 20 MHz clock.
Reserved.
1 – Reset all gyro digital signal path, accel digital signal path, and temp digital signal path.
This bit also clears all the sensor registers.

REGISTER 107 – POWER MANAGEMENT 1
Register Name: PWR_MGMT_1
Register Type: READ/WRITE
Register Address: 107 (Decimal); 6B (Hex)
BIT

NAME

[7]

DEVICE_RESET

[6]

SLEEP

[5]

ACCEL_CYCLE[4]

GYRO_STANDBY[3]

TEMP_DIS[2:0]

CLKSEL[2:0]

FUNCTION
1 – Reset the internal registers and restores the default settings. The bit automatically clears
to 0 once the reset is done.
When set to 1, the chip is set to sleep mode.
When set to 1, and SLEEP and STANDBY are not set to 1, the chip will cycle between sleep
and taking a single accelerometer sample at a rate determined by SMPLRT_DIV
Note: When all accelerometer axes are disabled via PWR_MGMT_2 register bits and cycle is enabled, thechip will wake up at the rate determined by the respective registers above, but will not take any
samples.

When set, the gyro drive and pll circuitry are enabled, but the sense paths are disabled. Thisis a low power mode that allows quick enabling of the gyros.
When set to 1, this bit disables the temperature sensor.
Code
0
1
2
3
4
5
6
7

Clock Source
Internal 20 MHz oscillator.
Auto selects the best available clock source – PLL if ready, else use the Internal oscillator
Auto selects the best available clock source – PLL if ready, else use the Internal oscillator
Auto selects the best available clock source – PLL if ready, else use the Internal oscillator
Auto selects the best available clock source – PLL if ready, else use the Internal oscillator
Auto selects the best available clock source – PLL if ready, else use the Internal oscillator
Internal 20 MHz oscillator.
Stops the clock and keeps timing generator in reset.

Note: The default value of CLKSEL[2:0] is 000. It is required that CLKSEL[2:0] be set to 001 to achieve full gyroscope performance.

Document Number: DS-000409
Revision: 1.2

Page 43 of 54

IAM-20680HP
REGISTER 108 – POWER MANAGEMENT 2
Register Name: PWR_MGMT_2
Register Type: READ/WRITE
Register Address: 108 (Decimal); 6C (Hex)
BIT
[7]
[6]

NAME
FIFO_LP_EN[5]

STBY_XA[4]

STBY_YA[3]

STBY_ZA[2]

STBY_XG[1]

STBY_YG[0]

STBY_ZG-FUNCTION
1 – Enable FIFO in low-power/WoM accelerometer mode. Default setting is 0.
Reserved.
1 – X accelerometer is disabled.
0 – X accelerometer is on.
1 – Y accelerometer is disabled.
0 – Y accelerometer is on.
1 – Z accelerometer is disabled.
0 – Z accelerometer is on.
1 – X gyro is disabled.
0 – X gyro is on.
1 – Y gyro is disabled.
0 – Y gyro is on.
1 – Z gyro is disabled.
0 – Z gyro is on.

REGISTERS 114 AND 115 – FIFO COUNT REGISTERS
Register Name: FIFO_COUNTH
Register Type: READ Only
Register Address: 114 (Decimal); 72 (Hex)
BIT
[7:5]

-

NAME

[4:0]

FIFO_COUNT[12:8]

FUNCTION
Reserved.
High Bits; count indicates the number of written bytes in the FIFO.
Reading this byte latches the data for both FIFO_COUNTH, and FIFO_COUNTL.

Register Name: FIFO_COUNTL
Register Type: READ Only
Register Address: 115 (Decimal); 73 (Hex)
BIT

NAME

[7:0]

FIFO_COUNT[7:0]

Document Number: DS-000409
Revision: 1.2

FUNCTION
Low Bits; count indicates the number of written bytes in the FIFO.
Note: Must read FIFO_COUNTH to latch new data for both FIFO_COUNTH and FIFO_COUNTL.

Page 44 of 54

IAM-20680HP
REGISTER 116 – FIFO READ WRITE
Register Name: FIFO_R_W
Register Type: READ/WRITE
Register Address: 116 (Decimal); 74 (Hex)
BIT
[7:0]

NAME
FIFO_DATA[7:0]

FUNCTION
Read/Write command provides Read or Write operation for the FIFO.

Description:
This register is used to read and write data from the FIFO buffer.
Data are written to the FIFO in order of register number (from lowest to highest). If all the FIFO enable flags (see below) are enabled,
the contents of registers 59 through 72 will be written in order at the Sample Rate.
The contents of the sensor data registers (Registers 59 to 72) are written into the FIFO buffer when their corresponding FIFO enableflags are set to 1 in FIFO_EN (Register 35).
If the FIFO buffer has overflowed, the status bit FIFO_OFLOW_INT is automatically set to 1. This bit is located in INT_STATUS(Register 58). When the FIFO buffer has overflowed, the oldest data will be lost and new data will be written to the FIFO unlessregister 26 CONFIG, bit[6] FIFO_MODE = 1.
If the FIFO buffer is empty, reading register FIFO_DATA will return a unique value of 0xFF until new data are available. Normal data
are precluded from ever indicating 0xFF, so 0xFF gives a trustworthy indication of FIFO empty.

REGISTER 117 – WHO AM I
Register Name: WHO_AM_I
Register Type: READ only
Register Address: 117 (Decimal); 75 (Hex)
BIT
[7:0]

NAME
WHOAMIFUNCTION
Register to indicate to user which device is being accessed.

This register is used to verify the identity of the device. The contents of WHOAMI is an 8-bit device ID. The default value of theregister is 0xF8. This is different from the I2C address of the device as seen on the slave I2C controller by the applications processor.
The I2C address of the IAM-20680HP is 0x68 or 0x69 depending upon the value driven on AD0 pin.

REGISTERS 119, 120, 122, 123, 125, 126 ACCELEROMETER OFFSET REGISTERS
Register Name: XA_OFFSET_H
Register Type: READ/WRITE
Register Address: 119 (Decimal); 77 (Hex)
BIT
[7:0]

NAME
XA_OFFS[14:7]

FUNCTION
Bits 14 to 7 of the 15-bit of the X accelerometer offset cancellation (2’s complement).
±16g Offset cancellation in all Full-Scale modes, 15 bit 0.98-mg steps

Register Name: XA_OFFSET_L
Register Type: READ/WRITE
Register Address: 120 (Decimal); 78 (Hex)
BIT

NAME

[7:1]

XA_OFFS[6:0][0]-Document Number: DS-000409
Revision: 1.2

FUNCTION
Bits 6 to 0 of the 15-bit of the X accelerometer offset cancellation. (2’s complement).
±16g Offset cancellation in all Full-Scale modes, 15 bit 0.98-mg steps.
Reserved. This bit is set during factory calibration and the value must be kept unchanged.

Page 45 of 54

IAM-20680HP
Register Name: YA_OFFSET_H
Register Type: READ/WRITE
Register Address: 122 (Decimal); 7A (Hex)
BIT
[7:0]

NAME
YA_OFFS[14:7]

FUNCTION
Bits 14 to 7 of the 15-bit of the Y accelerometer offset cancellation (2’s complement).
±16g Offset cancellation in all Full-Scale modes, 15 bit 0.98-mg steps.

Register Name: YA_OFFSET_L
Register Type: READ/WRITE
Register Address: 123 (Decimal); 7B (Hex)
BIT

NAME

[7:1]

YA_OFFS[6:0][0]-

FUNCTION
Bits 6 to 0 of the 15-bit of the Y accelerometer offset cancellation (2’s complement).
±16g Offset cancellation in all Full-Scale modes, 15 bit 0.98-mg steps..
Reserved. This bit is set during factory calibration and the value must be kept unchanged.

Register Name: ZA_OFFSET_H
Register Type: READ/WRITE
Register Address: 125 (Decimal); 7D (Hex)
BIT
[7:0]

NAME
ZA_OFFS[14:7]

FUNCTION
Bits 14 to 7 of the 15-bit of the Z accelerometer offset cancellation (2’s complement).
±16g Offset cancellation in all Full-Scale modes, 15 bit 0.98-mg steps.

Register Name: ZA_OFFSET_L
Register Type: READ/WRITE
Register Address: 126 (Decimal); 7E (Hex)
BIT

NAME

[7:1]

ZA_OFFS[6:0][0]-Document Number: DS-000409
Revision: 1.2

FUNCTION
Bits 6 to 0 of the 15-bit of the Z accelerometer offset cancellation (2’s complement).
±16g Offset cancellation in all Full-Scale modes, 15 bit 0.98-mg steps.
Reserved. This bit is set during factory calibration and the value must be kept unchanged.

Page 46 of 54

IAM-20680HP
10 ASSEMBLY
This section provides general guidelines for assembling TDK-InvenSense Micro Electro-Mechanical Systems (MEMS) gyros packaged
in LGA package.

ORIENTATION OF AXES
Figure 13 below shows the orientation of the axes of sensitivity and the polarity of rotation. Note the pin 1 identifier (•) in the figure.
+Z

+Y

+Z
+Y

+X

+X

Figure 13. Orientation of Axes of Sensitivity and Polarity of Rotation

Document Number: DS-000409
Revision: 1.2

Page 47 of 54

IAM-20680HP
PACKAGE DIMENSIONS
16 Lead LGA (3x3x0.75) mm3 NiAu pad finish

Figure 14. Package Dimensions

Document Number: DS-000409
Revision: 1.2

Page 48 of 54

IAM-20680HP
DIMENSIONS IN MILLIMETERS
Total Thickness
Substrate Thickness
Mold Thickness
Body Size
Lead Width
Lead Length
Lead Pitch
Lead Count
Edge Lead Center to Center
Body Center to Contact Lead
Ball Width
Ball Diameter
Ball Opening
Ball Pitch
Ball Count
Pre-Solder
Package Edge Tolerance
Mold Flatness
Coplanarity
Ball Offset (Package)
Ball Offset (Ball)
Lead Edge to Package Edge

SYMBOLS
A
A1
A2
D
E
W
L
e
n
D1
E1
SD
SE
b

MIN
0.7

2.9
2.9
0.2
0.3

---

e1
n1
--aaa
bbb
ddd
eee
fff
M

0.05

NOM
0.75
0.105
0.63
3
3
0.25
0.35
0.5
16
2
1
----------------0.1
0.2
0.08----0.1

MAX
0.8
REF
REF
3.1
3.1
0.3
0.4
BSC
BSC
BSC
BSC
BSC
---

---

0.15

Table 21. Package Dimensions

Document Number: DS-000409
Revision: 1.2

Page 49 of 54

IAM-20680HP
11 PART NUMBER PACKAGE MARKINGThe part number package marking for IAM-20680HP devices is summarized below:
PART NUMBER
IAM-20680HP

PART NUMBER PACKAGE MARKING
IA268HP
Table 22. Part Number Package Marking

TOP VIEWPart Number
Lot Traceability CodeIA268HP
XXXXXX
YYWW

Y Y = Year CodeW W = Work Week
Figure 15. Part Number Package Marking

Samples with Part Number Package Marking “IA268HP E” are engineering samples and may have deviations in respect to thespecifications and functions reported in the datasheet. Engineering samples are not production-intent parts.

Document Number: DS-000409
Revision: 1.2

Page 50 of 54

IAM-20680HP
12 REFERENCE
Please refer to “InvenSense MEMS Motion Handling and Assembly Guide (AN-IVS-0002A-00)” for the following information:••

Manufacturing Recommendationso Assembly Guidelines and Recommendationso PCB Design Guidelines and Recommendationso MEMS Handling Instructionso ESD Considerations
o Reflow Specificationo Storage Specificationso Package Marking Specificationo Tape & Reel Specificationo Reel & Pizza Box Labelo Packaging
o Representative Shipping Carton Label
Complianceo Environmental Complianceo DRC Complianceo Compliance Declaration Disclaimer

Document Number: DS-000409
Revision: 1.2

Page 51 of 54

IAM-20680HP
13 ERRATAPart Number

ErrataItem#

Datasheet revision
with Errata

Type of Errata

Technical
changeIAM-20680HP

1DS-000409 Rev. 1.0

Description of
behavior

No

Description
WOM ODR configuration bits

ERRATA ITEM #1: WOM ODR CONFIGURATION BITS
Background
Correction in
Datasheet Rev. 1.1
Affected Sections
ImpactWorkaround

Document Number: DS-000409
Revision: 1.2

DS-000409 revision 1.0 instructed to use SMPLRT_DIV register to change Accelerometer ODR in Lowpower mode / WoM mode.
ACCEL_WOM_ODR_CTRL[3:0] bits have been documented to change the Accelerometer ODR in Lowpower mode / WoM mode.
Section 5.1, Table 19, Section 9.14
SMPLRT_DIV does not perform any Accelerometer ODR change when GYRO is off and ACCEL_CYCLE is set
to ‘1’ (WoM mode).
ACCEL_WOM_ODR_CTRL[3:0] bit field must be used to change the Accelerometer ODR in WoM mode
(Gyroscope off and ACCEL_CYCLE is set to ‘1’).

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IAM-20680HP
14 REVISION HISTORYREVISION DATE
10/05/2020

REVISION
1.0

11/24/2020

1.1

12/10/2020

1.2

Document Number: DS-000409
Revision: 1.2

DESCRIPTION
Initial revision
Added Errata Section 13
Updated wording for Applications description
Updated Table 12: added Accelerometer Wake-on-Motion Mode and adjusted modes numbers
Updated section 4.18: improved power-up sequence and sensor initialization description
Added sections 4.18.3 and 4.18.7
Updated Section 5.1: updated wording, documented ACCEL_WOM_ODR_CTRL[3:0] to change
Accelerometer ODR in accelerometer WoM mode (Errata Item #1)
Updated Table 16: documented ACCEL_WOM_ODR_CTRL[3:0] (Errata Item #1)
Updated Table 19: documented ACCEL_WOM_ODR_CTRL to change WoM ODR (Errata Item #1),
added note 1
Updated Section 9.14: documented ACCEL_WOM_ODR_CTRL[3:0] (Errata Item #1), updated
wording
Updated Table 20: Added note 1
Updated Figure 14: Package Dimensions
Other minor changes
Updated footer on page 1
Clarified Note 2 in Table 1 and Table 2
Other minor changes

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IAM-20680HP

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Document Number: DS-000409
Revision: 1.2

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