PART NUMBER:± 2g / 4g / 8g / 16g Tri-axis Digital
Accelerometer Specifications

KXTJ3-1057
Rev. 5.0
17-Jun-2019

Product Description
The KXTJ3-1057 is a tri-axis ±2g, ±4g, ±8g, or ±16g silicon
micromachined accelerometer. The sense element is fabricated using
Kionix’s proprietary plasma micromachining process technology.
Acceleration sensing is based on the principle of a differential
capacitance arising from acceleration-induced motion of the sense
element, which further utilizes common mode cancellation to decrease
errors from process variation, temperature, and environmental stress.
The sense element is hermetically sealed at the wafer level by bonding
a second silicon lid wafer to the device using a glass frit. A separate
ASIC device packaged with the sense element provides signal
conditioning and digital communications. The accelerometer isdelivered in a 2 x 2 x 0.9 mm LGA plastic package operating from a 1.71V – 3.6V DC supply. Voltage
regulators are used to maintain constant internal operating voltages over the range of input supply voltages.
This results in stable operating characteristics over the range of input supply voltages and virtually
undetectable ratiometric error. The I2C digital protocol is used to communicate with the chip to configure
the part and monitor outputs.

Features
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•

•

Small footprint: 2 x 2 x 0.9 mm LGA 12-pin package (pin-to-pin compatible with KXTJ2)
Low current consumption: 0.9 µA in standby, 10 µA in Low Power, and 155 µA in High
Resolution modes
Extended user-configurable g-ranges: ±2g, ±4g, ±8g, ±16g
8-bit, 12-bit, and 14-bit resolution modes
Wide supply voltage range: 1.71V – 3.6V with internal voltage regulator
High resolution Wake-Up function with threshold configurable down to 3.9 mg
User-configurable Output Data Rates from 0.781Hz to 1600Hz
I2C digital communication interface up to 3.4MHz
Highly configurable interrupt control
Embedded Low Pass filter
Improved design to virtually eliminate post reflow offset and sensitivity shifts
Improved noise performance
Stable performance over temperature
High shock survivability
Self-test function
RoHS / REACH compliant

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Page 1 of 42

PART NUMBER:± 2g / 4g / 8g / 16g Tri-axis Digital
Accelerometer Specifications

KXTJ3-1057
Rev. 5.0
17-Jun-2019

Table of Contents
PRODUCT DESCRIPTION .............................................................................................................................................................. 1
FEATURES ................................................................................................................................................................................... 1
TABLE OF CONTENTS ................................................................................................................................................................... 2
FUNCTIONAL DIAGRAM .............................................................................................................................................................. 4
PRODUCT SPECIFICATIONS.......................................................................................................................................................... 5
MECHANICAL .................................................................................................................................................................................. 5
ELECTRICAL ..................................................................................................................................................................................... 6
Start Up Time Profile .................................................................................................................................................................. 7
Current Profile ............................................................................................................................................................................ 7
Power-On Procedure .................................................................................................................................................................. 8
ENVIRONMENTAL ........................................................................................................................................................................... 9
Handling, Mounting, Soldering................................................................................................................................................... 9
Floor Life ..................................................................................................................................................................................... 9
TERMINOLOGY .............................................................................................................................................................................. 10
g................................................................................................................................................................................................ 10
Sensitivity ................................................................................................................................................................................. 10
Zero-g offset ............................................................................................................................................................................. 10
Self-test..................................................................................................................................................................................... 10
FUNCTIONALITY ............................................................................................................................................................................ 11
Sense element .......................................................................................................................................................................... 11
ASIC interface ........................................................................................................................................................................... 11
Factory calibration ................................................................................................................................................................... 11
APPLICATION SCHEMATIC ............................................................................................................................................................. 12
PIN DESCRIPTION .......................................................................................................................................................................... 12
PACKAGE DIMENSIONS AND ORIENTATION ................................................................................................................................. 13
Dimensions ............................................................................................................................................................................... 13
Orientation ............................................................................................................................................................................... 14
DIGITAL INTERFACE ................................................................................................................................................................... 18
I2C SERIAL INTERFACE ................................................................................................................................................................... 18
I2C OPERATION .............................................................................................................................................................................. 19
WRITING TO AN 8-BIT REGISTER ................................................................................................................................................... 20
READING FROM AN 8-BIT REGISTER ............................................................................................................................................. 21
DATA TRANSFER SEQUENCES ....................................................................................................................................................... 22
HS-MODE ...................................................................................................................................................................................... 23
I2C TIMING DIAGRAM.................................................................................................................................................................... 24
EMBEDDED REGISTERS.............................................................................................................................................................. 25
REGISTER DESCRIPTIONS........................................................................................................................................................... 26
ACCELEROMETER OUTPUTS .......................................................................................................................................................... 26
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Page 2 of 42

PART NUMBER:± 2g / 4g / 8g / 16g Tri-axis Digital
Accelerometer Specifications

KXTJ3-1057
Rev. 5.0
17-Jun-2019

XOUT_L ......................................................................................................................................................................................... 28
XOUT_H ......................................................................................................................................................................................... 28
YOUT_L.......................................................................................................................................................................................... 28
YOUT_H ......................................................................................................................................................................................... 28
ZOUT_L .......................................................................................................................................................................................... 29
ZOUT_H ......................................................................................................................................................................................... 29
DCST_RESP .................................................................................................................................................................................... 29
WHO_AM_I ................................................................................................................................................................................... 29
INTERRUPT SOURCE REGISTERS .................................................................................................................................................... 30
INT_SOURCE1................................................................................................................................................................................ 30
INT_SOURCE2................................................................................................................................................................................ 30
STATUS_REG ................................................................................................................................................................................. 31
INT_REL ......................................................................................................................................................................................... 31
CTRL_REG1 .................................................................................................................................................................................... 32
CTRL_REG2 .................................................................................................................................................................................... 33
INT_CTRL_REG1 ............................................................................................................................................................................ 34
INT_CTRL_REG2 ............................................................................................................................................................................ 34
DATA_CTRL_REG ........................................................................................................................................................................... 35
WAKEUP_COUNTER ...................................................................................................................................................................... 36
NA_COUNTER................................................................................................................................................................................ 36
SELF_TEST ..................................................................................................................................................................................... 36
WAKEUP_THRESHOLD .................................................................................................................................................................. 36
EMBEDDED APPLICATIONS ....................................................................................................................................................... 37
MOTION INTERRUPT ..................................................................................................................................................................... 37
Feature Description .................................................................................................................................................................. 37
Enabling / Disabling ................................................................................................................................................................. 37
Latched / Pulsed / Unlatched Interrupt Modes ........................................................................................................................ 37
Debounce Counter .................................................................................................................................................................... 38
Non-Activity Counter ................................................................................................................................................................ 38
Threshold Resolution ................................................................................................................................................................ 38
Threshold Calculations ............................................................................................................................................................. 38
Wake-Up Detection Example.................................................................................................................................................... 39
REVISION HISTORY .................................................................................................................................................................... 41
APPENDIX ................................................................................................................................................................................. 42

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Page 3 of 42

PART NUMBER:± 2g / 4g / 8g / 16g Tri-axis Digital
Accelerometer Specifications

KXTJ3-1057
Rev. 5.0
17-Jun-2019

Functional Diagram

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Page 4 of 42

PART NUMBER:KXTJ3-1057± 2g / 4g / 8g / 16g Tri-axis Digital
Accelerometer Specifications

Rev. 5.0
17-Jun-2019

Product Specifications
Mechanical(specifications are for operation at 2.5V and T = 25C unless stated otherwise)
Parameters

Units

Min

Operating Temperature Range

°C

-40

Zero-g Offset

mg

Zero-g Offset Variation from RT over Temp.
± 8g

Sensitivity (14-bit)1,2

± 16g

mg/ºC
counts/g

± 2g
± 4g

Sensitivity (12-bit)1

± 8g

0.2
1024
512

counts/g

512
256

± 2g

64

Sensitivity Variation from RT over Temp.
Positive Self-Test Output change on Activation3

Noise4

+85

128

± 8g

Cross Axis Sensitivity

±25

1024

counts/g± 16g

Non-Linearity

Max

± 16g
± 4g

Sensitivity (8-bit)1

Typical

32
16
8

%/°C

0.01

g

0.5

% of FS

0.6%

2

RMS Noise

mg

0.7

Noise Densityµg / √Hz

150

Table 1: Mechanical Specifications
Notes:
1. Resolution and acceleration ranges are user selectable via I2C and via CTRL_REG1
register.
2. 14-bit Resolution is only available for registers 0x06 – 0x0B in the ±8g or ±16g High
Resolution mode
3. Self-test can be exercised by setting STPOL bit = 1 in INT_CTRL_REG1 register, thenwriting 0xCA to the SELF_TEST register.
4. Noise is measured in High Resolution mode (RES = 1 in CTRL_REG1 register) at 50Hz
ODR.

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Page 5 of 42

PART NUMBER:KXTJ3-1057± 2g / 4g / 8g / 16g Tri-axis Digital
Accelerometer Specifications

Rev. 5.0
17-Jun-2019

Electrical(specifications are for operation at 2.5V and T = 25C unless stated otherwise)
Parameters

Units

Min

TypicalMax

Supply Voltage (VDD) Operating

V

1.71

2.5

3.6

I/O Pads Supply Voltage (IO_VDD)

V

1.7

High Resolution Mode (RES=1)
Current Consumption

Low Power Mode1 (RES=0)

3.6
155

µA

10

Disabled

0.9

Output Low Voltage (VOL) (IO_VDD < 2V)2

V

-

-

0.2 * IO_VDD

Output Low Voltage (VOL) (IO_VDD ≥ 2V)2

V

-

-

0.4

Output High Voltage (VOH)V

0.8 * IO_VDD--

Input Low Voltage (VIL)

V

-

-

0.2 * IO_VDD

Input High Voltage(VIH)V

0.8 * IO_VDD--Start Up Time3ms~1/ODR

Power Up Time4

ms

12

2

MHz

I C Communication Rate30
3.4

I2C Slave Address (7-bit)5

0x0E / 0x0F

WHO_AM_I register value

0x35

Output Data Rate (ODR)6
Output Signal
Bandwidth (-3dB)7

HzHigh Resolution Mode (RES=1)
Low Power Mode (RES=0)

0.781

Hz

50

1600

ODR/2
800

Table 2: Electrical Specifications
Notes:
1. Current varies with Output Data Rate (ODR). See Current Profile section for details.
2. For I2C communication, this assumes a minimum 1.5kΩ pull-up resistor on SCL and
SDA pins.
3. Start up time is from PC1 bit set to 1 in CTRL_REG1 register to valid outputs. Timevaries with Output Data Rate (ODR) and power mode (RES bit setting in CTRL_REG1
register). See Figure 1 for details.
4. Power up time is from VDD and IO_VDD valid to device boot completion.
5. User selectable with ADDR pin. See Digital Interface section for details.
6. User selectable through I2C. The shown values are typical.
7. User selectable and dependent on ODR setting in DATA_CTRL_REG register and
RES bit setting in CTRL_REG1 register.

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Page 6 of 42

PART NUMBER:± 2g / 4g / 8g / 16g Tri-axis Digital
Accelerometer Specifications

KXTJ3-1057
Rev. 5.0
17-Jun-2019

Start Up Time Profile

Figure 1: Typical Start Up Time

Current Profile

Figure 2: Current Profile
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PART NUMBER:KXTJ3-1057± 2g / 4g / 8g / 16g Tri-axis Digital
Accelerometer Specifications

Rev. 5.0
17-Jun-2019

Power-On Procedure
Proper functioning of power-on reset (POR) is dependent on the specific VDD, VDDLOW, TVDD (risetime), and TVDD_OFF profile of individual applications. It is recommended to minimize VDDLOW, and TVDD,
and maximize TVDD_OFF. It is also advised that the VDD ramp up time TVDD be monotonic. Note that theoutputs will not be stable until VDD has reached its final value.
To assure proper POR, the application should be evaluated over the customer specified range of
VDD, VDDLOW, TVDD, TVDD_OFF and temperature as POR performance can vary depending on theseparameters.
Please refer to Technical Note TN017-Power-On-Procedure for more information.

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Page 8 of 42

PART NUMBER:± 2g / 4g / 8g / 16g Tri-axis Digital
Accelerometer Specifications

KXTJ3-1057
Rev. 5.0
17-Jun-2019

Environmental
Parameters

Units

Min

TypicalMax

Supply Voltage (VDD) Absolute Limits

V

-0.5

-

3.63

Operating Temperature Range

ºC

-40

-

85

Storage Temperature Range

ºC

-55

-

150

Mech. Shock (powered and unpowered)

g

-

-

5000 for 0.5ms
10000 for 0.2ms

ESD

V

-

-

2000

HBM

Table 3: Environmental Specifications
Caution: ESD Sensitive and Mechanical Shock Sensitive Component, improper handlingcan cause permanent damage to the device.

HF

This product is in conformance with RoHS directive, REACH
regulation, and is Halogen-Free. For the current certificate ofcompliance, visit www.kionix.com website.

Handling, Mounting, Soldering
For package handling, mounting, and soldering guidelines, see TN007 Package Handling, Mounting,and Soldering Guidelines technical note.

Floor Life
Factory floor life exposure of the KXTJ3 reels removed from the moisture barrier bag should notexceed a maximum of 168 hours at 30C/60%RH. If this floor life is exceeded, the parts should bedried per the IPC/JEDEC J-STD-033D standard (or latest revision).

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PART NUMBER:KXTJ3-1057± 2g / 4g / 8g / 16g Tri-axis Digital
Accelerometer Specifications

Rev. 5.0
17-Jun-2019

TerminologygA unit of acceleration equal to the acceleration of gravity at the earth's surface.

m
1g = 9.8 2s
One thousandth of a g (0.0098 m/ s2) is referred to as 1 milli-g (1 mg).

Sensitivity
The sensitivity of an accelerometer is the change in output per unit of input acceleration at nominal
VDD and temperature. The term is essentially the gain of the sensor expressed in counts per g(counts/g) or LSB’s per g (LSB/g). Occasionally, sensitivity is expressed as a resolution, i.e. milli-g
per LSB (mg/LSB) or milli-g per count (mg/count). Sensitivity for a given axis is determined bymeasurements of the formula:Sensitivity =(Output @+ 1g − Output @− 1g )2g

The sensitivity tolerance describes the range of sensitivities that can be expected from a large
population of sensors at room temperature and over life. When the temperature deviates from room
temperature (25ºC), the sensitivity will vary by the amount shown in Table 1.

Zero-g offset
Zero-g offset or 0-g offset describes the actual output of the accelerometer when no acceleration isapplied. Ideally, the output would always be in the middle of the dynamic range of the sensor (content
of the XOUT, YOUT, ZOUT registers = 0x00, expressed as a 2’s complement number). However,
because of mismatches in the sensor, calibration errors, and mechanical stress, the output can
deviate from 0x00. This deviation from the ideal value is called 0-g offset. The zero-g offset tolerance
describes the range of 0-g offsets of a population of sensors over the operating temperature range.

Self-test
Self-test allows a functional test of the sensor without applying a physical acceleration to it. When
activated, an electrostatic force is applied to the sensor, simulating an input acceleration. The sensor
outputs respond accordingly. If the output signals change within the amplitude specified in Table 1,then the sensor is working properly, and the parameters of the interface chip are within the defined
specifications.
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Page 10 of 42

PART NUMBER:± 2g / 4g / 8g / 16g Tri-axis Digital
Accelerometer Specifications

KXTJ3-1057
Rev. 5.0
17-Jun-2019

Functionality
Sense element
The sense element is fabricated using Kionix’s proprietary plasma micromachining process
technology. This process technology allows Kionix to create mechanical silicon structures which areessentially mass-spring systems that move in the direction of the applied acceleration. Acceleration
sensing is based on the principle of a differential capacitance arising from the acceleration-induced
motion. Capacitive plates on the moving mass move relative to fixed capacitive plates anchored tothe substrate. The sense element is hermetically sealed at the wafer level by bonding a second silicon
lid wafer to the device using a glass frit.

ASIC interface
A separate ASIC device packaged with the sense element provides all of the signal conditioning andcommunication with the sensor. The complete measurement chain is composed by a low-noise
capacitance to voltage amplifier which converts the differential capacitance of the MEMS sensor into
an analog voltage that is sent through an analog-to-digital converter. The acceleration data may beaccessed through the I2C digital communications provided by the ASIC. In addition, the ASIC contains
all of the logic to allow the user to choose data rates, g-ranges, filter settings, and interrupt logic.

Factory calibration
Kionix trims the offset and sensitivity of each accelerometer by adjusting gain (sensitivity) and 0-g
offset trim codes stored in non-volatile memory (OTP). Additionally, all functional register default
values are also programmed into the nonvolatile memory. Every time the device is turned on or asoftware reset command is issued, the trimming parameters and default register values aredownloaded into the volatile registers to be used during active operation. This allows the device tofunction without further calibration.

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Page 11 of 42

PART NUMBER:± 2g / 4g / 8g / 16g Tri-axis Digital
Accelerometer Specifications

KXTJ3-1057
Rev. 5.0
17-Jun-2019

Application Schematic

Pin Description
Pin

Name

Description

1

ADDR

I2C Address pin. This pin must be connected to IO_VDD or GND to determine the I2C Device Address.

2

SDA

3

IO_VDD4RES

I2C Serial Data
The power supply input for the digital communication bus. Optionally decouple this pin to ground with a 0.1uF ceramic
capacitor. (Internally tied to Pin 11)
Reserved. Connect to GND. Optionally, can be connected to IO_VDD or VDD. Do not leave floating.

5

INT

Physical Interrupt pin (Push-Pull). Leave floating if not used.

6

GND

Ground. (Internally tied to Pins 8, 9)

7

VDD

The power supply input. Decouple this pin to ground with a 0.1uF ceramic capacitor. (Internally tied to Pin 10)

8

GND

Ground. (Internally tied to Pins 6, 9)

9

GND

Ground. (Internally tied to Pins 6, 8)

10

VDD

11

IO_VDD12

SCL

The power supply input. Decouple this pin to ground with a 0.1uF ceramic capacitor. (Internally tied to Pin 7)
The power supply input for the digital communication bus. Optionally decouple this pin to ground with a 0.1uF ceramic
capacitor. (Internally tied to Pin 3)
I2C Serial Clock

Table 4: Pin Description

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Page 12 of 42

PART NUMBER:± 2g / 4g / 8g / 16g Tri-axis Digital
Accelerometer Specifications

KXTJ3-1057
Rev. 5.0
17-Jun-2019

Package Dimensions and Orientation
Dimensions
2 x 2 x 0.9 mm LGA

All dimensions and tolerances conform to ASME Y14.5M-1994

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PART NUMBER:KXTJ3-1057± 2g / 4g / 8g / 16g Tri-axis Digital
Accelerometer Specifications

Rev. 5.0
17-Jun-2019

Orientation

When device is accelerated in +X, +Y or +Z direction, the corresponding output will increase.

Static X/Y/Z Output Response versus Orientation to Earth’s surface (1g):
GSEL1=0, GSEL0=0, EN16G=0 (±2g)
1Position2

3

4

Diagram

5
Top

6
Bottom

BottomTop

Resolution(bits)

12

8

12

8

12

8

12

8

12

8

12

8

X (counts)

+1024

+64

0

0

-1024

-64

0

0

0

0

0

0

Y (counts)

0

0

-1024

-64

0

0

+1024

+64

0

0

0

0

Z (counts)

0

0

0

0

0

0

0

0

+1024

+64

-1024

-64

X-Polarity

+

0

-

0

0

0

Y-Polarity

0

-

0

+

0

0

Z-Polarity

0

0

0

0

+

-

(1g)
Earth’s Surface

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PART NUMBER:KXTJ3-1057± 2g / 4g / 8g / 16g Tri-axis Digital
Accelerometer Specifications

Rev. 5.0
17-Jun-2019

Static X/Y/Z Output Response versus Orientation to Earth’s surface (1g):
GSEL1=0, GSEL0=1, EN16G=0 (±4g)
Position

1

2

3

4

Diagram

5
Top

6
Bottom

BottomTop

Resolution(bits)

12

8

12

8

12

8

12

8

12

8

12

8

X (counts)

+512

+32

0

0

-512

-32

0

0

0

0

0

0

Y (counts)

0

0

-512

-32

0

0

+512

+32

0

0

0

0

Z (counts)

0

0

0

0

0

0

0

0

+512

+32

-512

-32

X-Polarity

+

0

-

0

0

0

Y-Polarity

0

-

0

+

0

0

Z-Polarity

0

0

0

0

+

-

(1g)
Earth’s Surface

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PART NUMBER:KXTJ3-1057± 2g / 4g / 8g / 16g Tri-axis Digital
Accelerometer Specifications

Rev. 5.0
17-Jun-2019

Static X/Y/Z Output Response versus Orientation to Earth’s surface (1g):
GSEL1=1, GSEL0=0, EN16G=0 (±8g)
GSEL1=1, GSEL0=1, EN16G=0 (±8g)11

Position2

3

4

Diagram

5

6

Top

Bottom

BottomTop

Resolution (bits)

14

12

8

14

12

8

14

12

8

14

12

8

14

12

8

14

12

8

X (counts)

+1024

+256

+16

0

0

0

-1024

-256

-16

0

0

0

0

0

0

0

0

0

Y (counts)

0

0

0

-1024

-256

-16

0

0

0

+1024

+256

+16

0

0

0

0

0

0

Z (counts)

0

0

0

0

0

0

0

0

0

0

0

0

+1024

+256

+16

-1024

-256

-16

X-Polarity

+

0

-

0

0

0

Y-Polarity

0

-

0

+

0

0

Z-Polarity

0

0

0

0

+

-

(1g)
Earth’s Surface
Notes:
1. This is applicable for 14-bit mode only in High Resolution mode

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PART NUMBER:KXTJ3-1057± 2g / 4g / 8g / 16g Tri-axis Digital
Accelerometer Specifications

Rev. 5.0
17-Jun-2019

Static X/Y/Z Output Response versus Orientation to Earth’s surface (1g):
GSEL1=0, GSEL0=0, EN16G=1 (±16g)
GSEL1=0, GSEL0=1, EN16G=1 (±16g)
GSEL1=1, GSEL0=0, EN16G=1 (±16g)
GSEL1=1, GSEL0=1, EN16G=1 (±16g)11

Position2

3

4

Diagram

5
Top

6
Bottom

BottomTop

Resolution (bits)

14

12

8

14

12

8

14

12

8

14

12

8

14

12

8

14

12

8

X (counts)

+512

+128

+8

0

0

0

-512

-128

-8

0

0

0

0

0

0

0

0

0

Y (counts)

0

0

0

-512

-128

-8

0

0

0

+512

+128

+8

0

0

0

0

0

0

Z (counts)

0

0

0

0

0

0

0

0

0

0

0

0

+512

+128

+8

-512

-128

-8

X-Polarity

+

0

-

0

0

0

Y-Polarity

0

-

0

+

0

0

Z-Polarity

0

0

0

0

+

-

(1g)
Earth’s Surface
Notes:
1. This is applicable for 14-bit mode only in High Resolution mode

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Page 17 of 42

PART NUMBER:± 2g / 4g / 8g / 16g Tri-axis Digital
Accelerometer Specifications

KXTJ3-1057
Rev. 5.0
17-Jun-2019

Digital Interface
The Kionix KXTJ3 digital accelerometer has the ability to communicate on the I2C digital serial interface
bus. This allows for easy system integration by eliminating analog-to-digital converter requirements andby providing direct communication with system micro-controllers.
The serial interface terms and descriptions as indicated in Table 5 will be observed throughout thisdocument.
Term
Transmitter
Receiver
MasterSlave

Description
The device that transmits data to the bus.
The device that receives data from the bus.
The device that initiates a transfer, generates clock signals, and terminates a transfer.
The device addressed by the Master.
Table 5: Serial Interface Terminologies

I2C Serial Interface
As previously mentioned, the KXTJ3 has the ability to communicate on an I2C bus. I2C is primarily used
for synchronous serial communication between a Master device and one or more Slave devices. The
Master, typically a micro controller, provides the serial clock signal and addresses Slave devices on thebus. The KXTJ3 always operates as a Slave device during standard Master-Slave I2C operation.
I2C is a two-wire serial interface that contains a Serial Clock (SCL) line and a Serial Data (SDA) line. SCL
is a serial clock that is provided by the Master, but can be held LOW by any Slave device, putting theMaster into a wait condition. SDA is a bi-directional line used to transmit and receive data to and fromthe interface. Data is transmitted MSB (Most Significant Bit) first in 8-bit per byte format, and the numberof bytes transmitted per transfer is unlimited. The I2C bus is considered free when both lines are HIGH.
The I2C interface is compliant with high-speed mode, fast mode and standard mode I2C standards.

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PART NUMBER:KXTJ3-1057± 2g / 4g / 8g / 16g Tri-axis Digital
Accelerometer Specifications

Rev. 5.0
17-Jun-2019

I2C Operation
Transactions on the I2C bus begin after the Master transmits a start condition (S), which is defined as a HIGHto-LOW transition on the data line while the SCL line is held HIGH. The bus is considered busy after thiscondition. The next byte of data transmitted after the start condition contains the Slave Address (SAD) in theseven MSBs (Most Significant Bits), and the LSB (Least Significant Bit) tells whether the Master will bereceiving data ‘1’ from the Slave or transmitting data ‘0’ to the Slave. When a Slave Address is sent, eachdevice on the bus compares the seven MSBs with its internally stored address. If they match, the device
considers itself addressed by the Master. The Slave Address associated with the KXTJ3 is 00011YX, where
the user programmable bit X, is determined by the assignment of ADDR pin to GND or IO_VDD. Also, thefactory programmable bit Y is set at the factory. For KXTJ3-1057, the factory programmable bit Y is fixed to
1 (contact your Kionix sales representative for list of available devices). Table 6 lists possible I2C addresses
for KXTJ3-1057. It is possible to have up to four accelerometers on a shared I 2C bus as shown in Figure 3(i.e. two KXTJ3-1057 accelerometers and two additional accelerometers with the factory programmable bit Y
set to 0).

Description

Address
Pad

7-bit
Address

Address

<7>

<6>

<5>

<4>

I2C WrI2C RdI2C WrI2C RdGND
GND
IO_VDD
IO_VDD

0x0E
0x0E
0x0F
0x0F

0x1C
0x1D
0x1E
0x1F

0
0
0
0

0
0
0
0

0
0
0
0

1
1
1
1

Y

X

<3>

<2>

<1>

<0>

1
1
1
1

1
1
1
1

0
0
1
1

0
1
0
1

Table 6: I2C Slave Addresses for KXTJ3-1057
It is mandatory that receiving devices acknowledge (ACK) each transaction. Therefore, the transmittermust release the SDA line during this ACK pulse. The receiver then pulls the data line LOW so that itremains stable LOW during the HIGH period of the ACK clock pulse. A receiver that has been addressed,
whether it is Master or Slave, is obliged to generate an ACK after each byte of data has been received.
To conclude a transaction, the Master must transmit a stop condition (P) by transitioning the SDA linefrom LOW to HIGH while SCL is HIGH. The I2C bus is now free. Note that if the KXTJ3 is accessed
through I2C protocol before the startup is finished a NACK signal is sent.

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Page 19 of 42

PART NUMBER:KXTJ3-1057± 2g / 4g / 8g / 16g Tri-axis Digital
Accelerometer Specifications

Rev. 5.0
17-Jun-2019

I2C Device

Part Number

ADDR Pin

Slave Address

Bit Y (Bit 1 in 7-bit address)

1

KXTJ3-1057

GND

0x0E

Factory Set to 1

2

KXTJ3-1057

IO_VDD

0x0F

Factory Set to 1

3

*KXMMM

GND

0x0C

Factory Set to 0

4

*KXMMM

IO_VDD

0x0D

Factory Set to 0

* KXMMM – contact Kionix sales representative for list of compatible devices

Figure 3: Multiple KXTJ3 Accelerometers on a Shared I2C Bus

Writing to an 8-bit Register
Upon power up, the Master must write to the KXTJ3’s control registers to set its operational mode.
Therefore, when writing to a control register on the I 2C bus, as shown Sequence 1 below, the following
protocol must be observed: After a start condition, SAD+W transmission, and the KXTJ3 ACK has beenreturned, an 8-bit Register Address (RA) command is transmitted by the Master. This command is telling
the KXTJ3 to which 8-bit register the Master will be writing the data. Since this is I2C mode, the MSB of
the RA command should always be zero (0). The KXTJ3 acknowledges the RA and the Master transmits
the data to be stored in the 8-bit register. The KXTJ3 acknowledges that it has received the data and theMaster transmits a stop condition (P) to end the data transfer. The data sent to the KXTJ3 is now stored
in the appropriate register. The KXTJ3 automatically increments the received RA commands and,
therefore, multiple bytes of data can be written to sequential registers after each Slave ACK as shown inSequence 2 on the following page.
**Note** If a STOP condition is sent on the least significant bit of write data or the following masteracknowledge cycle, the last write operation is not guaranteed and it may alter the content of the affected
registers.
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Page 20 of 42

PART NUMBER:± 2g / 4g / 8g / 16g Tri-axis Digital
Accelerometer Specifications

KXTJ3-1057
Rev. 5.0
17-Jun-2019

Reading from an 8-bit Register
When reading data from a KXTJ3 8-bit register on the I2C bus, as shown in Sequence 3 on the next page,
the following protocol must be observed: The Master first transmits a start condition (S) and theappropriate Slave Address (SAD) with the LSB set at ‘0’ to write. The KXTJ3 acknowledges and theMaster transmits the 8-bit RA of the register it wants to read. The KXTJ3 again acknowledges, and theMaster transmits a repeated start condition (Sr). After the repeated start condition, the Master addresses
the KXTJ3 with a ‘1’ in the LSB (SAD+R) to read from the previously selected register. The Slave thenacknowledges and transmits the data from the requested register. The Master does not acknowledge(NACK) it received the transmitted data but transmits a stop condition to end the data transfer. Note that
the KXTJ3 automatically increments through its sequential registers, allowing data to be read from multiple
registers following a single SAD+R command as shown below in Sequence 4. The 8-bit register data istransmitted using a left-most format, first bit shifted/clocked out being the MSB bit. If a receiver cannot
transmit or receive another complete byte of data until it has performed some other function, it can hold
SCL LOW to force the transmitter into a wait state. Data transfer only continues when the receiver is readyfor another byte and releases SCL.
**Note** Accelerometer’s output data should be read in a single transaction using the auto-increment
feature to prevent output data from being updated prior to intended completion of the read transaction.

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Page 21 of 42

PART NUMBER:KXTJ3-1057± 2g / 4g / 8g / 16g Tri-axis Digital
Accelerometer Specifications

Rev. 5.0
17-Jun-2019

Data Transfer Sequences
The following information clearly illustrates the variety of data transfers that can occur on the I 2C bus andhow the Master and Slave interact during these transfers. Table 7 defines the I2C terms used during thedata transfers.
Term
S
Sr
SAD
W
R
ACK
NACK
RA
Data
P

Definition
Start Condition
Repeated Start Condition
Slave Address
Write Bit
Read Bit
Acknowledge
Not Acknowledge
Register Address
Transmitted/Received Data
Stop Condition
Table 7: I2C Terms

Sequence 1: The Master is writing one byte to the Slave.
MasterSlave

S

SAD + W

RA
ACK

DATA
ACK

P
ACK

Sequence 2: The Master is writing multiple bytes to the Slave.
MasterSlave

S

SAD + W

RA
ACK

DATA
ACK

DATA
ACK

P
ACK

Sequence 3: The Master is receiving one byte of data from the Slave.
MasterSlave

S

SAD + W

RA
ACK

Sr

SAD + R

ACK

NACK
ACK

P

DATA

Sequence 4: The Master is receiving multiple bytes of data from the Slave.
MasterSlave

S

SAD + W

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RA
ACK

Sr
ACK

SAD + R

ACK
ACK

DATA

NACK
DATA

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Page 22 of 42

PPART NUMBER:KXTJ3-1057± 2g / 4g / 8g / 16g Tri-axis Digital
Accelerometer Specifications

Rev. 5.0
17-Jun-2019

HS-modeTo enter the 3.4MHz high speed mode of communication, the device must receive the following sequenceof conditions from the master: a Start condition followed by a Master code (00001XXX) and a Master
Non-acknowledge. Once recognized, the device switches to HS-mode communication. Read/write datatransfers then proceed as described in the sequences above. Devices return to the FS-mode after a
STOP occurrence on the bus.
Sequence 5: HS-mode data transfer of the Master writing multiple bytes to the Slave.
Speed
MasterSlaveS

FS-modeM-code NACKSr

SAD + W
ACK

HS-modeRA
ACK

FS-mode
DATA

P
ACK

n bytes + ack.
Sequence 6: HS-mode data transfer of the Master receiving multiple bytes of data from the Slave.
Speed
MasterSlave
Speed
MasterSlaveS

FS-modeM-code NACK

Sr

HS-modeSAD + W
RA
ACK

ACK

HS-modeSr

FS-modeSAD + R

NACK
ACK

DATA

ACK

P

DATA

(n-1) bytes +ack.

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Page 23 of 42

PART NUMBER:KXTJ3-1057± 2g / 4g / 8g / 16g Tri-axis Digital
Accelerometer Specifications

Rev. 5.0
17-Jun-2019

I2C Timing Diagram

Number
t0
t1
t2
t3
t4
t5
t6
t7
t8
t9
t10
t11
Note

Description
SDA LOW to SCL LOW transition (Start event)SDA LOW to first SCL rising edge
SCL pulse width: HIGH
SCL pulse width: LOW
SCL HIGH before SDA falling edge (Start Repeated)
SCL pulse width: HIGH during a S/Sr/P event
SCL HIGH before SDA rising edge (Stop)
SDA pulse width: HIGH
SDA valid to SCL rising edge
SCL rising edge to SDA invalid
SCL falling edge to SDA valid (when slave istransmitting)
SCL
falling edge to SDA invalid (when slave istransmitting)
Recommended
I2C CLK
Table 8: I2C Timing (Fast Mode)

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MIN
50
100
100
100
50
100
50
25
50
50
0
2.5

MAX
100
-

Units
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
µs

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Page 24 of 42

PART NUMBER:KXTJ3-1057± 2g / 4g / 8g / 16g Tri-axis Digital
Accelerometer Specifications

Rev. 5.0
17-Jun-2019

Embedded Registers
The KXTJ3 has 22 embedded 8-bit registers that are accessible by the user. This section contains theaddresses for all embedded registers and describes bit functions of each register.
Register Name

Type (R/W)

Register Address (Hex)Kionix Reserved-

0x00 – 0x05

XOUT_LR

0x06

XOUT_HR

0x07

YOUT_L

R

0x08

YOUT_HR

0x09

ZOUT_LR

0x0A

ZOUT_HR

0x0B

DCST_RESP

R

0x0C

Kionix Reserved-

0x0D – 0x0E

WHO_AM_I

R

0x0F

Kionix Reserved-

0x10 – 0 x15

INT_SOURCE1

R

0x16

INT_SOURCE2

R

0x17

STATUS_REG

R

0x18

Kionix Reserved

-

0x19

INT_RELR

0x1A

CTRL_REG1*

R/W

0x1B

Kionix Reserved

-

0x1C

CTRL_REG2*

R/W

0x1D

INT_CTRL_REG1*

R/W

0x1E

INT_CTRL_REG2*

R/W

0x1F

Kionix Reserved

-

0x20

DATA_CTRL_REG*

R/W

0x21

Kionix Reserved-

0x22 – 0x28

WAKEUP_COUNTER*

R/W

0x29

NA_COUNTER*

R/W

0x2A

Kionix Reserved-

0x2B – 0x39

SELF_TEST*

W

0x3A

Kionix Reserved-

0x3B – 0x69

WAKEUP_THRESHOLD_H*

R/W

0x6A

WAKEUP_THRESHOLD_L*

R/W

0x6B

Table 9: Register Map* Note: When changing the contents of these registers, the PC1 bit in CTRL_REG1 must first be set to “0”36 Thornwood Dr. – Ithaca, NY 14850
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Page 25 of 42

PART NUMBER:KXTJ3-1057± 2g / 4g / 8g / 16g Tri-axis Digital
Accelerometer Specifications

Rev. 5.0
17-Jun-2019

Register Descriptions
Accelerometer Outputs
These registers contain up to 14-bits of valid acceleration data for each. The data is updated
every user-defined ODR period, is protected from overwrite during each read, and can beconverted from digital counts to acceleration (g) per Table 10 below. The register acceleration
output binary data is represented in 2’s complement format. For example, if N = 14 bits, then theCounts range is from -8192 to 8191, if N = 12 bits, then the Counts range is from -2048 to 2047,
and if N = 8 bits, then the Counts range is from -128 to 127.
14-bitRegister Data
Equivalent(2’s complement) Counts in decimal

Range = ±2g

Range = ±4g

Range = ±8g

Range = ±16g

01 1111 1111 1111

8191

Not available

Not available+7.999g+15.998g

01 1111 1111 1110

8190

Not available

Not available+7.998g+15.996g

…

…

…

…

…

…

00 0000 0000 0001

1

Not available

Not available+0.00098g+0.00195g

00 0000 0000 0000

0

Not available

Not available

0.000g0.000g

11 1111 1111 1111

-1

Not available

Not available-0.00098g-0.00195g

…

…

…

…

…

…

10 0000 0000 0001

-8191

Not available

Not available-7.999g-15.998g

10 0000 0000 0000

-8192

Not available

Not available-8.000g-16.000g

Range = ±2g

Range = ±4g

Range = ±8g

Range = ±16g12-bitRegister Data
Equivalent(2’s complement) Counts in decimal
0111 1111 1111

2047

+1.999g+3.998g+7.996g+15.992g

0111 1111 1110

2046

+1.998g+3.996g+7.992g+15.984g

…

…

…

…

…

…

0000 0000 0001

1+0.001g+0.002g+0.0039g+0.0078g

0000 0000 0000

00.000g0.000g0.0000g

0.0000g

1111 1111 1111

-1

-0.001g-0.002g-0.0039g-0.0078g

…

…

…

…

…

…

1000 0000 0001

-2047

-1.999g-3.998g-7.996g-15.992g

1000 0000 0000

-2048

-2.000g-4.000g-8.000g-16.000g

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Page 26 of 42

PART NUMBER:KXTJ3-1057± 2g / 4g / 8g / 16g Tri-axis Digital
Accelerometer Specifications

Rev. 5.0
17-Jun-2019

8-bit
Register Data
Equivalent(2’s complement) Counts in decimal

Range = ±2g

Range = ±4g

Range = ±8g

Range = ±16g

0111 1111

127+1.984g+3.969g+7.938g+15.875g

0111 1110

126+1.969g+3.938g+7.875g+15.75g

…

…

…

…

…

…

0000 0001

1+0.016g+0.031g+0.0625g+0.125g0000 0000

00.000g0.000g0.000g0.000g1111 1111-1-0.016g-0.031g-0.0625g-0.125g

…

…

…

…

…

…

1000 0001-127-1.984g-3.969g-7.938g-15.875g

1000 0000-128-2.000g-4.000g-8.000g-16.000g

Table 10: Acceleration (g) Calculation

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Page 27 of 42

PART NUMBER:± 2g / 4g / 8g / 16g Tri-axis Digital
Accelerometer Specifications

KXTJ3-1057
Rev. 5.0
17-Jun-2019

XOUT_L
X-axis accelerometer output least significant byteR
XOUTD5XOUTD3X
Bit7

R
XOUTD4XOUTD2X
Bit6

R
XOUTD3XOUTD1
X
Bit5

R
XOUTD2XOUTD0X
Bit4

R
XOUTD1
X
X
Bit3

R
XOUTD0
X
X
Bit2

R
R
X
X
X
X
X
X
Bit1
Bit0
Address: 0x06

Resolution
14-bit12-bit8-bit

XOUT_HX-axis accelerometer output most significant byte
R
R
R
R
R
XOUTD13 XOUTD12 XOUTD11 XOUTD10 XOUTD9XOUTD11 XOUTD10 XOUTD9 XOUTD8 XOUTD7
XOUTD7 XOUTD6 XOUTD5 XOUTD4 XOUTD3
Bit7
Bit6
Bit5
Bit4
Bit3

R
XOUTD8XOUTD6XOUTD2
Bit2

Resolution
RR
14-bitXOUTD7 XOUTD6
12-bitXOUTD5 XOUTD4
8-bit
XOUTD1 XOUTD0
Bit1
Bit0
Address: 0x07

YOUT_L
Y-axis accelerometer output least significant byteR
YOUTD5
YOUTD3
X
Bit7

R
YOUTD4
YOUTD2
X
Bit6

R
YOUTD3
YOUTD1
X
Bit5

R
YOUTD2
YOUTD0
X
Bit4

R
YOUTD1
X
X
Bit3

R
YOUTD0
X
X
Bit2

R
R
Y
Y
X
X
X
X
Bit1
Bit0
Address: 0x08

Resolution
14-bit12-bit8-bit

YOUT_HY-axis accelerometer output most significant byte
R
R
R
R
R
YOUTD13 YOUTD12 YOUTD11 YOUTD10 YOUTD9YOUTD11 YOUTD10 YOUTD9 YOUTD8 YOUTD7
YOUTD7 YOUTD6 YOUTD5 YOUTD4 YOUTD3
Bit7
Bit6
Bit5
Bit4
Bit3

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R
YOUTD8
YOUTD6
YOUTD2
Bit2

R
R
Resolution
YOUTD7 YOUTD6
14-bitYOUTD5 YOUTD412-bitYOUTD1 YOUTD0
8-bit
Bit1
Bit0
Address: 0x09

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Page 28 of 42

PART NUMBER:± 2g / 4g / 8g / 16g Tri-axis Digital
Accelerometer Specifications

KXTJ3-1057
Rev. 5.0
17-Jun-2019

ZOUT_L
Z-axis accelerometer output least significant byteR
ZOUTD5ZOUTD3X
Bit7

R
ZOUTD4ZOUTD2X
Bit6

R
ZOUTD3ZOUTD1X
Bit5

R
ZOUTD2ZOUTD0X
Bit4

R
ZOUTD1
X
X
Bit3

R
ZOUTD0
X
X
Bit2

R
R
Y
Y
X
X
X
X
Bit1
Bit0
Address: 0x0A

Resolution
14-bit12-bit8-bit

ZOUT_HZ-axis accelerometer output most significant byte
R
R
R
R
R
ZOUTD13 ZOUTD12 ZOUTD11 ZOUTD10 ZOUTD9ZOUTD11 ZOUTD10 ZOUTD9 ZOUTD8 ZOUTD7ZOUTD7 ZOUTD6 ZOUTD5 ZOUTD4 ZOUTD3
Bit7
Bit6
Bit5
Bit4
Bit3

R
ZOUTD8ZOUTD6ZOUTD2
Bit2

R
R
Resolution
ZOUTD7 ZOUTD6
14-bitZOUTD5 ZOUTD412-bitZOUTD1 ZOUTD0
8-bit
Bit1
Bit0
Address: 0x0B

DCST_RESPThis register can be used to verify proper integrated circuit functionality. It always has a byte valueof 0x55 unless the DCST bit in CTRL_REG2 is set. At that point this value is set to 0xAA. The byte value
is returned to 0x55 after reading this register.
R
DCSTR7Bit7

R
DCSTR6
Bit6

R
DCSTR5
Bit5

R
DCSTR4Bit4R
DCSTR3
Bit3

R
DCSTR2
Bit2

R
R
DCSTR1 DCSTR0
Bit1
Bit0
Address: 0x0C

Reset Value
01010101

WHO_AM_I
This register can be used for supplier recognition, as it can be factory written to a known byte
value. The default value is 0x35.
R
WIA7
Bit7

R
WIA6
Bit6

R
WIA5
Bit5

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R
WIA4
Bit4

R
WIA3
Bit3

R
WIA2
Bit2

R
R
WIA1
WIA0
Bit1
Bit0
Address: 0x0F

Reset Value
00110101© 2019 Kionix – All Rights Reserved889-12758-1906171454-0.38
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PART NUMBER:± 2g / 4g / 8g / 16g Tri-axis Digital
Accelerometer Specifications

KXTJ3-1057
Rev. 5.0
17-Jun-2019

Interrupt Source Registers
These two registers report interrupt state changes. This data is updated when a new interrupt
event occurs and each application’s result is latched until the interrupt release register is read. The
programmable interrupt engine can be configured to report data in an unlatched manner via the interrupt
control registers.

INT_SOURCE1
This register reports which function caused an interrupt. Reading from the interrupt release
register (INT_REL) will clear the entire contents of this register.
R
0
Bit7

R
0
Bit6

R
0
Bit5

R
DRDY
Bit4

R
0
Bit3

R
0
Bit2

R
R
WUFS
0
Bit1
Bit0
Address: 0x16

DRDY – indicates that new acceleration data (0x06 to 0x0B) is available. This bit iscleared when acceleration data is read or the interrupt release register (INT_REL)
is read.
0 = New acceleration data not available
1 = New acceleration data available
WUFS – Wake-up has occurred. This bit is cleared when the interrupt source latch register(INT_REL) is read (see Table 15 for details).
0 = No motion
1 = Motion has activated the interrupt

INT_SOURCE2
This register reports the axis and direction of detected motion per Table 11. This register is cleared
when the interrupt source latch register (INT_REL) is read (see Table 15 for details).
R
0
Bit7

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R
0
Bit6

R
XNWU
Bit5

R
XPWU
Bit4

R
YNWU
Bit3

R
YPWU
Bit2

R
R
ZNWU
ZPWU
Bit1
Bit0
Address: 0x17

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PART NUMBER:± 2g / 4g / 8g / 16g Tri-axis Digital
Accelerometer Specifications

KXTJ3-1057
Rev. 5.0
17-Jun-2019

Bit
XNWU
XPWU
YNWU
YPWU
ZNWU
ZPWU

Description
X Negative (X-) Reported
X Positive (X+) Reported
Y Negative (Y-) Reported
Y Positive (Y+) Reported
Z Negative (Z-) Reported
Z Positive (Z+) Reported
Table 11: Motion Reporting

STATUS_REG
This register reports the status of the interrupt.
R
0
Bit7

R
0
Bit6

R
0
Bit5

R
INT
Bit4

R
0
Bit3

R
0
Bit2

R
R
0
0
Bit1
Bit0
Address: 0x18

INT – reports the combined (OR) interrupt information of DRDY and WUFS in the interrupt
source register (INT_SOURCE1). This bit is cleared when acceleration data isread or the interrupt release register (INT_REL) is read (see Table 15 for details).
0 = no interrupt event
1 = interrupt event has occurred

INT_REL
Latched interrupt source information (INT_SOURCE1 and INT_SOURCE2) is cleared and physicalinterrupt latched pin (INT) is changed to its inactive state when this register is read (see Table 15 for details).
R
X
Bit7

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R
X
Bit6

R
X
Bit5

R
X
Bit4

R
X
Bit3

R
X
Bit2

R
R
X
X
Bit1
Bit0
Address: 0x1A

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PART NUMBER:± 2g / 4g / 8g / 16g Tri-axis Digital
Accelerometer Specifications

KXTJ3-1057
Rev. 5.0
17-Jun-2019

CTRL_REG1
Read/write control register that controls the main feature set.
R/W
PC1
Bit7

R/W
RES
Bit6

R/W
DRDYE
Bit5

R/W
GSEL1
Bit4

R/W
GSEL0
Bit3

R/W
EN16G
Bit2

R/W
R/W
WUFE
0
Bit1
Bit0
Address: 0x1B

Reset Value
00000000

PC1 – controls the operating mode of the KXTJ3.
0 = stand-by mode
1 = operating mode
RES – determines the performance mode of the KXTJ3. Note that to change the value of thisbit, the PC1 bit must first be set to “0”.
0 = Low Power, 8-bit valid. Only available for ODR ≤ 200 Hz. Bandwidth (Hz) = 800.
1 = High Resolution, 12-bit or 14-bit valid. Bandwidth (Hz) = ODR/2
DRDYE – enables the reporting of the availability of new acceleration data as an interrupt.
Note that to change the value of this bit, the PC1 bit must first be set to “0”.
0 = availability of new acceleration data is not reflected as an interrupt
1 = availability of new acceleration data is reflected as an interrupt
GSEL1, GSEL0, EN16G – selects the acceleration range of the accelerometer outputs per
Table 12. Note that to change the value of this bit, the PC1 bit must first be set to “0”.
GSEL1 GSEL0 EN16G
Range
0
0
0
±2g
0
1
0
±4g
1
0
0
±8g
1
1
0
±8g1
0
0
1
±16g
0
1
1
±16g
1
0
1
±16g
1
1
1
±16g1
Table 12: Selected Acceleration Range
WUFE – enables the Wake-Up (motion detect) function. Note that to change the value of thisbit, the PC1 bit must first be set to “0”.
0 = Wake-Up function disabled
1 = Wake-Up function enabled
1 This is a 14-bit mode available only in High Resolution mode and only for Registers 0x06h-0x0Bh
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PART NUMBER:KXTJ3-1057± 2g / 4g / 8g / 16g Tri-axis Digital
Accelerometer Specifications

Rev. 5.0
17-Jun-2019

CTRL_REG2
Read/write control register that provides more feature set control. Note that to properly change thevalue of this register, the PC1 bit in CTRL_REG1 must first be set to “0”.
R/W
SRST
Bit7

R/W
R/W
Reserved Reserved
Bit6
Bit5

R/W
DCST
Bit4

R/W
Reserved
Bit3

R/W
OWUFA
Bit2

R/W
R/W
OWUFB OWUFC
Bit1
Bit0
Address: 0x1D

Reset Value
00000000

SRST – initiates software reset, which performs the RAM reboot routine. This bit will remain 1
until the RAM reboot routine is finished. Please refer to Technical Note TN017 PowerOn Procedure for more information on software reset.
SRST = 0 – no action
SRST = 1 – start RAM reboot routine
Note: Setting SRST = 1 will NOT result in an ACK, since the part immediately enters
the RAM reboot routine. NACK may be used to confirm this command.
Reserved – Care must be taken to not overwrite Reset Value of reserved bit(s)DCST – initiates the digital communication self-test function.
DCST = 0 – no action
DCST = 1 – sets DCST_RESP register to 0xAA and when DCST_RESP is read,sets this bit to 0 and sets DCST_RESP to 0x55
OWUFA, OWUFB, OWUFC – sets the Output Data Rate for the Wake-Up function (motion
detection) per Table 13.
OWUFA OWUFB OWUFC Output Data Rate
0000.781Hz0011.563Hz01
03.125Hz01
1
6.25Hz10012.5Hz
1
0
1
25Hz
1
1
0
50Hz
1
1
1
100Hz
Table 13: Output Data Rate for Wake-Up Function
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PART NUMBER:KXTJ3-1057± 2g / 4g / 8g / 16g Tri-axis Digital
Accelerometer Specifications

Rev. 5.0
17-Jun-2019

INT_CTRL_REG1
This register controls the settings for the physical interrupt pin (INT). Note that to properly change
the value of this register, the PC1 bit in CTRL_REG1 must first be set to “0”.
R/W
0
Bit7

R/W
0
Bit6

R/W
IEN
Bit5

R/W
IEA
Bit4

R/W
IEL
Bit3

R/W
0
Bit2

R/W
R/W
STPOL
0
Bit1
Bit0
Address: 0x1E

Reset Value
00010000

IEN – enables/disables the physical interrupt pin (INT)IEN = 0 – physical interrupt pin (INT) is disabled
IEN = 1 – physical interrupt pin (INT) is enabled
IEA – sets the polarity of the physical interrupt pin (INT)IEA = 0 – polarity of the physical interrupt pin (INT) is active LOW
IEA = 1 – polarity of the physical interrupt pin (INT) is active HIGH
IEL – sets the response of the physical interrupt pin (INT) (see Table 15 for details)
IEL = 0 – the physical interrupt pin (INT) latches until it is cleared by reading INT_REL
IEL = 1 – the physical interrupt pin (INT) will transmit one pulse with a period of 0.03 0.05ms
STPOL – Self-test polarity.
STPOL = 0 – negative polarity (unsupported)
STPOL = 1 – positive polarity (supported)

INT_CTRL_REG2
This register controls which axis and direction of detected motion can cause an interrupt. Note that toproperly change the value of this register, the PC1 bit in CTRL_REG1 must first be set to “0”.
R/W
ULMODE
Bit7

R/W
0
Bit6

R/W
XNWUE
Bit5

R/W
XPWUE
Bit4

R/W
YNWUE
Bit3

R/W
YPWUE
Bit2

R/W
R/W
ZNWUE ZPWUE
Bit1
Bit0
Address: 0x1F

Reset Value
00111111ULMODE – Unlatched mode motion interrupt (see Table 15 for details)
ULMOD = 0 – Unlatched mode is disabledULMOD = 1 – Unlatched mode is enabled

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PART NUMBER:KXTJ3-1057± 2g / 4g / 8g / 16g Tri-axis Digital
Accelerometer Specifications

Rev. 5.0
17-Jun-2019

XNWU - x negative (x-): 0 = disabled, 1 = enabled
XPWU - x positive (x+): 0 = disabled, 1 = enabledYNWU - y negative (y-): 0 = disabled, 1 = enabledYPWU - y positive (y+): 0 = disabled, 1 = enabledZNWU - z negative (z-): 0 = disabled, 1 = enabledZPWU - z positive (z+): 0 = disabled, 1 = enabled

DATA_CTRL_REG
Read/write control register that configures the acceleration outputs. Note that to properly change thevalue of this register, the PC1 bit in CTRL_REG1 must first be set to “0”.
R/W
0
Bit7

R/W
0
Bit6

R/W
0
Bit5

R/W
0
Bit4

R/W
OSAA
Bit3

R/W
OSAB
Bit2

R/W
R/W
OSAC
OSAD
Bit1
Bit0
Address: 0x21

Reset Value
00000010

OSAA, OSAB, OSAC, OSAD – sets the output data rate (ODR) for the low-pass filteredacceleration outputs per Table 14.
OSAA OSAB OSAC OSAD Output Data Rate
LPF Roll-Off
10000.781Hz
0.3905Hz
1001
1.563Hz0.781Hz101
03.125Hz
1.563Hz10
1
1
6.25Hz3.125Hz000012.5Hz6.25Hz000125Hz
12.5Hz
0
0
1
0
50Hz
25Hz
0
0
1
1
100Hz
50Hz
0
1
0
0
200Hz
100Hz
0
1
0
1
400Hz
200Hz
0
1
1
0
800Hz
400Hz
0
1
1
1
1600Hz
800Hz
Table 14: Acceleration Output Data Rate (ODR) and LPF Roll-Off
Note: Output Data Rates ≥ 400Hz will force device into High Resolution mode

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PART NUMBER:KXTJ3-1057± 2g / 4g / 8g / 16g Tri-axis Digital
Accelerometer Specifications

Rev. 5.0
17-Jun-2019

WAKEUP_COUNTER
This register sets the time motion must be present before a wake-up interrupt is set. Every count iscalculated as 1/OWUF delay period. Note that to properly change the value of this register, the PC1 bit in
CTRL_REG1 must first be set to “0”. Valid entries are from 1 to 255, excluding the zero value.
R/W
WUFC7
Bit7

R/W
WUFC6
Bit6

R/W
WUFC5
Bit5

R/W
WUFC4
Bit4

R/W
WUFC3
Bit3

R/W
WUFC2
Bit2

R/W
R/W
WUFC1
WUFC0
Bit1
Bit0
Address: 0x29

Reset Value
00000000

NA_COUNTER
This register sets the non-activity time required before another wake-up interrupt can be set. Everycount is calculated as 1/OWUF delay period. Note that to properly change the value of this register, the PC1
bit in CTRL_REG1 must first be set to “0”. Valid entries are from 1 to 255, excluding the zero value.
R/W
NAFC7
Bit7

R/W
NAFC6
Bit6

R/W
NAFC5
Bit5

R/W
NAFC4
Bit4

R/W
NAFC3
Bit3

R/W
NAFC2
Bit2

R/W
R/W
NAFC1
NAFC0
Bit1
Bit0
Address: 0x2A

Reset Value
00000000

SELF_TEST
When 0xCA is written to this register, the MEMS self-test function is enabled. Electrostatic-actuationof the accelerometer, results in a DC shift of the X, Y and Z axes outputs. Writing 0x00 to this register will
return the accelerometer to normal operation. Note that to properly change the value of this register, the PC1
bit in CTRL_REG1 must first be set to “0”.
W
0
Bit7

W
0
Bit6

W
0
Bit5

W
0
Bit4

W
0
Bit3

W
0
Bit2

W
W
0
0
Bit1
Bit0
Address: 0x3A

Reset Value
00000000

WAKEUP_THRESHOLD
This register sets the threshold for wake-up (motion detect) interrupt is set. Data bytes are
WAKEUP_THRESHOLD_H, WAKEUP_THRESHOLD_L. The KXTJ3 will be shipped from the factory withthis value set to correspond to a change in acceleration of 0.5g. Note that to properly change the value of
this register, the PC1 bit in CTRL_REG1 must first be set to “0”.
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W Address
Register
Reset Value
WUTH11 WUTH10 WUTH9 WUTH8 WUTH7 WUTH6 WUTH5 WUTH4 0x6A WAKEUP_THRESHOLD_H 00001000
WUTH3 WUTH2 WUTH1 WUTH000000x6B WAKEUP_THRESHOLD_L 00000000
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
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PART NUMBER:KXTJ3-1057± 2g / 4g / 8g / 16g Tri-axis Digital
Accelerometer Specifications

Rev. 5.0
17-Jun-2019

Embedded Applications
Motion Interrupt
Feature Description
KXTJ3 features a threshold interrupts triggered by the internal digital wake-up engine. This engine
allows the KXTJ3 to trigger interrupt when accelerometer activity exceeds a threshold window (Wake-Up
event). Note that this function only generates an interrupt and doesn’t trigger any changes to the partconfiguration (e.g. power mode, ODR, etc.).

Enabling / Disabling
The Wake-up detection can be enabled/disabled using WUFE bit in CTRL_REG1 register and the
direction of motion detection can be set for any axis in INT_CTRL_REG2 register. The sampling rate for the
Wake-Up function is independent of the output data rate of the KXTJ3 and is set by OWUF bits in
CTRL_REG2.

Latched / Pulsed / Unlatched Interrupt Modes
The wake-up event can be programmed to be reported on physical interrupt pin INT. There are three
supported modes that are configured using IEL bit in CTRL_REG2 register and ULMODE bit in
INT_CTRL_REG2 register. The modes are Latched, Pulsed, and Unlatched. Depending on the interrupt
mode, the behavior of the external interrupt pin INT, the wake-up function status bit WUFS in INT_SOURCE1
register, the interrupt report bit INT in STATUS_REG, and corresponding motion direction detection bit(XNWU / XPWU / YNWU / YPWU / ZNWU / ZPWU) in the INT_SOURCE2 registers will be different.
ULMODE

IEL

Interrupt
Mode

0

0

Latched0

1

Pulsed10Unlatched

1

1

PulsedExternal INT Pin

INT bit and WUFS bit

INT pin latches
until INT_REL isread
INT pin is pulsed@ 0.03-0.05 ms

INT and WUFS bit are 1 until
INT_REL is read

INT pin is pulsed
and automatically
cleared after
1/OWUF
INT pin is pulsed@ 0.03-0.05 ms

INT bit and WUFS bit are 1
until auto-cleared after
1/OWUFXNWU / XPWU / YNWU /YPWU / ZNWU / ZPWUThe corresponding motion
directions bit is set to 1 until
INT_REL is read
The corresponding motion
directions bit is set to 1 until
INT_REL is read
The corresponding motion
directions bit is set to 1 until
INT_REL is read

INT bit and WUFS bit are 1
until auto-cleared after
1/OWUFThe corresponding motion
directions bit is set to 1 until
INT_REL is read

INT and WUFS bit are 1 until
INT_REL is read

Table 15: Latched / Pulsed / Unlatched Interrupt Modes Configuration
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PART NUMBER:± 2g / 4g / 8g / 16g Tri-axis Digital
Accelerometer Specifications

KXTJ3-1057
Rev. 5.0
17-Jun-2019

Debounce Counter
The Wake-Up digital engine has an internal debounce counter to qualify motion status detection. The
debounce counter function can be set using WUFC<7:0> bits in WAKEUP_COUNTER register. Note thateach Wake-Up Function Counter (WUFC) count qualifies 1 (one) user-defined Wake-Up Function ODR
period as set by OWUF<2:0> bits in CTRL_REG2 register. Equation 1 shows how to calculate the
WAKEUP_COUNTER register value for a desired wake-up delay time.
WAKEUP_COUNTER (counts) = Wake-Up Delay Time (sec) x Wake-Up Function ODR (Hz)Equation 1: Wake-Up Delay Time Calculations

Non-Activity Counter
The Non-Activity register sets the non-activity time required before another wake-up interrupt will bereported. The non-activity counter function can be set using NAFC7<7:0> bits in NA_COUNTER register.
Note that each Non-Activity Function Counter (NAFC) count qualifies 1 (one) user-defined Wake-Up Function
ODR period as set by OWUF<2:0> bits in CTRL_REG2 register. Equation 2 shows how to calculate the
WAKEUP_COUNTER register value for a desired wake-up delay time.
NA_COUNTER (counts) = Non-Activity Time (sec) x Wake-Up Function ODR (Hz)Equation 2: Non-Activity Counter Calculations

Threshold Resolution
The motion interrupt threshold values are set by WUTH<11:0> bits in the WAKEUP_THRESHOLD
registers and are compared to the top 12 bits of the accelerometer 8g output value (regardless of GSEL<1:0>
setting in CTRL_REG1 register). This results in threshold resolution of 256 counts/g or 3.9mg/countThreshold Calculations
To calculate the desired wake-up threshold use Equation 3. Please note that the wake-up engine function is
independent of the user selected g-range.
WAKEUP_THRESHOLD (counts) = Desired Threshold (g) x 256 (counts/g)
Equation 3: Wake-Up Threshold Calculations

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PART NUMBER:± 2g / 4g / 8g / 16g Tri-axis Digital
Accelerometer Specifications

KXTJ3-1057
Rev. 5.0
17-Jun-2019

Wake-Up Detection Example
The latched motion interrupt response algorithm works as following: while the part is in inactive state, thealgorithm evaluates differential measurement between each new acceleration data point with the preceding
one and evaluates it against the WAKEUP_THRESHOLD threshold. When the differential measurement isgreater than WAKEUP_THRESHOLD threshold, the wakeup counter starts the count. Differential
measurements are now calculated based on the difference between the current acceleration and theacceleration when the counter started. The part will report that motion has occurred at the end of the countassuming each differential measurement has remained above the threshold. If at any moment during thecount the differential measurement falls below the threshold, the counter will stop the count and the part willremain in inactive state.
To illustrate how the algorithm works, consider the Figure 4 below that shows the latched response of the
motion detection algorithm with WAKEUP_COUNTER set to 10 counts. Note how the difference between
the acceleration sample marked in red and the one marked in green resulted in a differential measurement
represented with orange bar being above the WAKEUP_THRESHOLD. At this point, the counter begins tocount number of counts stored in WAKEUP_COUNTER register and the wakeup algorithm will evaluate thedifference between each new acceleration measurement and the measurement marked in green that willremain a reference measurement for the duration of the counter count. At the end of the count, assuming
all differential measurements were larger than WAKEUP_THRESHOLD, as is the case in the example
showed in Figure 4, a motion event will be reported. Figure 4 below shows the latched response of the
Wake-Up Function with WUF counter = 10 counts.

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PART NUMBER:± 2g / 4g / 8g / 16g Tri-axis Digital
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KXTJ3-1057
Rev. 5.0
17-Jun-2019

Figure 4: Latched Motion Interrupt Response

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PART NUMBER:KXTJ3-1057± 2g / 4g / 8g / 16g Tri-axis Digital
Accelerometer Specifications

Rev. 5.0
17-Jun-2019

Revision History
Revision
1.0
2.0

3.0

4.0

5.0

Description
Initial Release
Clarified 14bit/12bit/8bit operation throughout the document.
Updated Notice section.
Clarified Wake Up register naming.
Fixed Pin number of physical interrupt pin in INT_CTRL_REG1 and
INT_REL registers to (5) from (7).
Added Appendix section.
Added drive type for INT pin in Pin Description Table.
Updated IO_VDD max value in Electrical Specifications.
Updated note under the Electrical Spec that Start Up timing also varies withpower mode.
Removed Signal Bandwidth (-3dB) from Mechanical Specification.
Update Start Up Timing Figure.
Updated Environmental section.
Updated I2C Operation section to add support for alternative I2C address.
Updated Package Outline Drawing.
Updated Handling, Mounting, Soldering and Floor Life sections.
Updated I2CFixed Reg 0x6B name in Register Map(WAKEUP_THRESHOLD_L).
Updated description of WUFS, INT, RES, SRST, IEL, ULMODE bits.
Updated description of INT_SOURCE2, INT_REL,
WAKEUP_THRESHOLD, SELF_TEST registers.
Updated Embedded Wake-Up Function engine description.
Fixed 14-bit 2's complement values in Accelerometer Outputs section.
Fixed number of 8-bit registers accessible by the user in Embedded
Registers section.
Added WHO_AM_I value to the Electrical Specifications table.
Revised formats for Start Up profile and Current Profile plots.

Date
08-Nov-2016
10-Nov-2016

27-Sep-2017

05-Oct-2018

17-Jun-2019"Kionix" is a registered trademark of Kionix, Inc. Products described herein are protected by patents issued or pending. No license is granted by implication or otherwise
under any patent or other rights of Kionix. The information contained herein is believed to be accurate and reliable but is not guaranteed. Kionix does not assume
responsibility for its use or distribution. Kionix also reserves the right to change product specifications or discontinue this product at any time without prior notice. Thispublication supersedes and replaces all information previously supplied.

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PART NUMBER:± 2g / 4g / 8g / 16g Tri-axis Digital
Accelerometer Specifications

KXTJ3-1057
Rev. 5.0
17-Jun-2019

Appendix
The following Notice is included to guide the use of Kionix products in its application and manufacturing
processes. Kionix, Inc., is a ROHM Group company. For purposes of this Notice, the name “ROHM” would
also imply Kionix, Inc.

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Notice
Precaution on using ROHM Products
1.

Our Products are designed and manufactured for application in ordinary electronic equipment (such as AV equipment,
OA equipment, telecommunication equipment, home electronic appliances, amusement equipment, etc.). If you
intend to use our Products in devices requiring extremely high reliability (such as medical equipment (Note 1), transport
equipment, traffic equipment, aircraft/spacecraft, nuclear power controllers, fuel controllers, car equipment including car
accessories, safety devices, etc.) and whose malfunction or failure may cause loss of human life, bodily injury or
serious damage to property (“Specific Applications”), please consult with the ROHM sales representative in advance.
Unless otherwise agreed in writing by ROHM in advance, ROHM shall not be in any way responsible or liable for any
damages, expenses or losses incurred by you or third parties arising from the use of any ROHM’s Products for Specific
Applications.
(Note1) Medical Equipment Classification of the Specific Applications
JAPAN
USA
EU
CHINA
CLASSⅢ
CLASSⅡb
CLASSⅢ
CLASSⅢ
CLASSⅣ
CLASSⅢ

2.

ROHM designs and manufactures its Products subject to strict quality control system. However, semiconductor
products can fail or malfunction at a certain rate. Please be sure to implement, at your own responsibilities, adequate
safety measures including but not limited to fail-safe design against the physical injury, damage to any property, whicha failure or malfunction of our Products may cause. The following are examples of safety measures:[a] Installation of protection circuits or other protective devices to improve system safety[b] Installation of redundant circuits to reduce the impact of single or multiple circuit failure

3.

Our Products are designed and manufactured for use under standard conditions and not under any special or
extraordinary environments or conditions, as exemplified below. Accordingly, ROHM shall not be in any way
responsible or liable for any damages, expenses or losses arising from the use of any ROHM’s Products under any
special or extraordinary environments or conditions. If you intend to use our Products under any special or
extraordinary environments or conditions (as exemplified below), your independent verification and confirmation of
product performance, reliability, etc, prior to use, must be necessary:[a] Use of our Products in any types of liquid, including water, oils, chemicals, and organic solvents[b] Use of our Products outdoors or in places where the Products are exposed to direct sunlight or dust[c] Use of our Products in places where the Products are exposed to sea wind or corrosive gases, including Cl2,
H2S, NH3, SO2, and NO2[d] Use of our Products in places where the Products are exposed to static electricity or electromagnetic waves[e] Use of our Products in proximity to heat-producing components, plastic cords, or other flammable items[f] Sealing or coating our Products with resin or other coating materials[g] Use of our Products without cleaning residue of flux (Exclude cases where no-clean type fluxes is used.
However, recommend sufficiently about the residue.) ; or Washing our Products by using water or water-soluble
cleaning agents for cleaning residue after soldering[h] Use of the Products in places subject to dew condensation

4.

The Products are not subject to radiation-proof design.

5.

Please verify and confirm characteristics of the final or mounted products in using the Products.

6.

In particular, if a transient load (a large amount of load applied in a short period of time, such as pulse. is applied,confirmation of performance characteristics after on-board mounting is strongly recommended. Avoid applying power
exceeding normal rated power; exceeding the power rating under steady-state loading condition may negatively affectproduct performance and reliability.

7.

De-rate Power Dissipation depending on ambient temperature. When used in sealed area, confirm that it is the use in
the range that does not exceed the maximum junction temperature.

8.

Confirm that operation temperature is within the specified range described in the product specification.

9.

ROHM shall not be in any way responsible or liable for failure induced under deviant condition from what is defined inthis document.

Precaution for Mounting / Circuit board design
1.

When a highly active halogenous (chlorine, bromine, etc.) flux is used, the residue of flux may negatively affect productperformance and reliability.

2.

In principle, the reflow soldering method must be used on a surface-mount products, the flow soldering method must
be used on a through hole mount products. If the flow soldering method is preferred on a surface-mount products,
please consult with the ROHM representative in advance.

For details, please refer to ROHM Mounting specification

Notice-PGA-E© 2015 ROHM Co., Ltd. All rights reserved.

Rev.004

Precautions Regarding Application Examples and External Circuits
1.

If change is made to the constant of an external circuit, please allow a sufficient margin considering variations of thecharacteristics of the Products and external components, including transient characteristics, as well as static
characteristics.

2.

You agree that application notes, reference designs, and associated data and information contained in this document
are presented only as guidance for Products use. Therefore, in case you use such information, you are solely
responsible for it and you must exercise your own independent verification and judgment in the use of such information
contained in this document. ROHM shall not be in any way responsible or liable for any damages, expenses or losses
incurred by you or third parties arising from the use of such information.

Precaution for Electrostatic
This Product is electrostatic sensitive product, which may be damaged due to electrostatic discharge. Please take proper
caution in your manufacturing process and storage so that voltage exceeding the Products maximum rating will not beapplied to Products. Please take special care under dry condition (e.g. Grounding of human body / equipment / solder iron,
isolation from charged objects, setting of Ionizer, friction prevention and temperature / humidity control).

Precaution for Storage / Transportation
1.

Product performance and soldered connections may deteriorate if the Products are stored in the places where:[a] the Products are exposed to sea winds or corrosive gases, including Cl 2, H2S, NH3, SO2, and NO2[b] the temperature or humidity exceeds those recommended by ROHM
[c] the Products are exposed to direct sunshine or condensation[d] the Products are exposed to high Electrostatic

2.

Even under ROHM recommended storage condition, solderability of products out of recommended storage time period
may be degraded. It is strongly recommended to confirm solderability before using Products of which storage time isexceeding the recommended storage time period.

3.

Store / transport cartons in the correct direction, which is indicated on a carton with a symbol. Otherwise bent leads
may occur due to excessive stress applied when dropping of a carton.

4.

Use Products within the specified time after opening a humidity barrier bag. Baking is required before using Products ofwhich storage time is exceeding the recommended storage time period.

Precaution for Product Label
A two-dimensional barcode printed on ROHM Products label is for ROHM’s internal use only.

Precaution for Disposition
When disposing Products please dispose them properly using an authorized industry waste company.

Precaution for Foreign Exchange and Foreign Trade act
Since concerned goods might be fallen under listed items of export control prescribed by Foreign exchange and Foreign
trade act, please consult with ROHM in case of export.

Precaution Regarding Intellectual Property Rights
1.

All information and data including but not limited to application example contained in this document is for reference
only. ROHM does not warrant that foregoing information or data will not infringe any intellectual property rights or any
other rights of any third party regarding such information or data.

2.

ROHM shall not have any obligations where the claims, actions or demands arising from the combination of the
Products with other articles such as components, circuits, systems or external equipment (including software).

3.

No license, expressly or implied, is granted hereby under any intellectual property rights or other rights of ROHM or any
third parties with respect to the Products or the information contained in this document. Provided, however, that ROHM
will not assert its intellectual property rights or other rights against you or your customers to the extent necessary to
manufacture or sell products containing the Products, subject to the terms and conditions herein.

Other Precaution
1.

This document may not be reprinted or reproduced, in whole or in part, without prior written consent of ROHM.

2.

The Products may not be disassembled, converted, modified, reproduced or otherwise changed without prior writtenconsent of ROHM.

3.

In no event shall you use in any way whatsoever the Products and the related technical information contained in the
Products or this document for any military purposes, including but not limited to, the development of mass-destruction
weapons.

4.

The proper names of companies or products described in this document are trademarks or registered trademarks of
ROHM, its affiliated companies or third parties.

Notice-PGA-E© 2015 ROHM Co., Ltd. All rights reserved.

Rev.004