±0.5°C Accurate, 16-Bit Digital
I2C Temperature Sensor
ADT7410

Data SheetFEATURES

GENERAL DESCRIPTIONHigh performance
Temperature accuracy±0.5°C from −40°C to +105°C (2.7 V to 3.6 V)±0.4°C from −40°C to +105°C (3.0 V)
16-bit temperature resolution: 0.0078°C
Fast first temperature conversion on power-up of 6 ms
Easy implementation
No temperature calibration/correction required by user
No linearity correction required
Low power
Power saving 1 sample per second (SPS) mode
700 µW typical at 3.3 V in normal mode
7 µW typical at 3.3 V in shutdown mode
Wide operating ranges
Temperature range: −55°C to +150°C
Voltage range: 2.7 V to 5.5 V
Programmable interrupts
Critical overtemperature interrupt
Overtemperature/undertemperature interrupt
I2C-compatible interface
8-lead narrow SOIC RoHS-compliant package

The ADT7410 is a high accuracy digital temperature sensor in anarrow SOIC package. It contains a band gap temperature reference
and a 13-bit ADC to monitor and digitize the temperature to a
0.0625°C resolution. The ADC resolution, by default, is set to
13 bits (0.0625°C). This can be changed to 16 bits (0.0078°C) by
setting Bit 7 in the configuration register (Register Address 0x03).
The ADT7410 is guaranteed to operate over supply voltages from
2.7 V to 5.5 V. Operating at 3.3 V, the average supply current is typically 210 μA. The ADT7410 has a shutdown mode that powers
down the device and offers a shutdown current of typically 2 μA.
The ADT7410 is rated for operation over the −55°C to +150°C
temperature range.
Pin A0 and Pin A1 are available for address selection, giving the
ADT7410 four possible I2C addresses. The CT pin is an opendrain output that becomes active when the temperature exceeds
a programmable critical temperature limit. The default criticaltemperature limit is 147°C. The INT pin is also an open-drain
output that becomes active when the temperature exceeds aprogrammable limit. The INT and CT pins can operate in either
comparator or interrupt mode.

APPLICATIONS
Medical equipment
Environmental control systems
Computer thermal monitoring
Thermal protection
Industrial process control
Power system monitors
Hand-held applications

FUNCTIONAL BLOCK DIAGRAM
VDD
8TEMPERATUREVALUEREGISTER

ADT7410INTERNAL
OSCILLATORCONFIGURATIONREGISTERTCRITREGISTER
THIGH
REGISTER

6

CT

5

INT

1

SCL

2

SDA

TCRIT
INTERNAL
REFERENCE
Σ-Δ
MODULATORTEMPERATURESENSOR

THIGH

TLOW
REGISTER

A0

3

A1

4

POINTERREGISTERFILTERLOGIC

I2C INTERFACE
7

GND

TLOW

06560-001

THYST
REGISTER

Figure 1.
Rev. C

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ADT7410

Data SheetTABLE OF CONTENTS
Features .............................................................................................. 1

Temperature Value Registers .................................................... 13

Applications ....................................................................................... 1

Status Register ............................................................................. 14

General Description ......................................................................... 1

Configuration Register .............................................................. 14

Functional Block Diagram .............................................................. 1

THIGH Setpoint Registers ............................................................. 15

Revision History ............................................................................... 2

TLOW Setpoint Registers.............................................................. 15

Specifications..................................................................................... 3

TCRIT Setpoint Registers.............................................................. 15

I2C Timing Specifications ............................................................ 4

THYST Setpoint Register............................................................... 16

Absolute Maximum Ratings............................................................ 5

ID Register................................................................................... 16

ESD Caution .................................................................................. 5

Serial Interface ................................................................................ 17

Pin Configurations and Function Descriptions ........................... 6

Serial Bus Address ...................................................................... 17

Typical Performance Characteristics ............................................. 7

Writing Data ............................................................................... 18

Theory of Operation ........................................................................ 9

Reading Data............................................................................... 19

Circuit Information ...................................................................... 9

Reset ............................................................................................. 19

Converter Details.......................................................................... 9

General Call ................................................................................ 19

Temperature Measurement ......................................................... 9

INT and CT Outputs...................................................................... 21

One-Shot Mode .......................................................................... 10

Undertemperature and Overtemperature Detection ............ 21

1 SPS Mode .................................................................................. 10

Applications Information .............................................................. 23

Shutdown ..................................................................................... 11

Thermal Response Time ........................................................... 23

Fault Queue ................................................................................. 11

Supply Decoupling ..................................................................... 23

Temperature Data Format ......................................................... 12

Temperature Monitoring ........................................................... 23

Temperature Conversion Formulas ......................................... 12

Outline Dimensions ....................................................................... 24

Registers ........................................................................................... 13

Ordering Guide .......................................................................... 24

Address Pointer Register ........................................................... 13

REVISION HISTORY
9/2017—Rev. B to Rev. C
Removed 16-Lead LFCSP ............................................. Throughout
Changes to Table 3 ............................................................................ 5
Deleted Figure 5; Renumbered Sequentially................................. 6
Changes to Table 4 ............................................................................ 6
Changes to Table 6 .......................................................................... 13
Updated Outline Dimensions, Deleted Figure 24 ...................... 24
Changes to Ordering Guide .......................................................... 24
7/2016—Rev. A to Rev. B
Added 16-Lead LFCSP....................................................... Universal
Changes to Table 3 ............................................................................ 5
Added Figure 5; Renumbered Sequentially .................................. 6
Changes to Table 4 ............................................................................ 6
Changes to Table 9 .......................................................................... 13
Changes to Table 10 ........................................................................ 14
Changes to Interrupt Mode Section and Figure 20 .................... 21

Changes to Figure 21...................................................................... 22
Updated Outline Dimensions ....................................................... 24
Changes to Ordering Guide .......................................................... 24
12/2011—Rev. 0 to Rev. A
Changes to Features Section ............................................................1
Changes to Table 1.............................................................................3
Changes to Figure 5 ...........................................................................7
Changes to One-Shot Mode Section and 1 SPS Mode
Section.............................................................................................. 10
Changes to Shutdown Section ...................................................... 11
Changes to Table 8 and Table 9 .................................................... 13
Changes to Table 10 and Table 11 ................................................ 14
Changes to Ordering Guide .......................................................... 24
4/2009—Revision 0: Initial Version

Rev. C | Page 2 of 24

Data Sheet

ADT7410SPECIFICATIONSTA = −55°C to +150°C, VDD = 2.7 V to 5.5 V, unless otherwise noted.
Table 1.
Parameter
TEMPERATURE SENSOR AND ADC
Accuracy 1

Min

ADC Resolution

Temperature Resolution
13-Bit16-BitTemperature Conversion Time
Fast Temperature Conversion Time
1 SPS Conversion Time
Temperature Hysteresis
Repeatability 3
DC PSRR
DIGITAL OUTPUTS (OPEN DRAIN)High Output Leakage Current, IOH
Output High Current
Output Low Voltage, VOL
Output High Voltage, VOH
Output Capacitance, COUT
DIGITAL INPUTS
Input Current
Input Low Voltage, VIL
Input High Voltage, VIH
SCL, SDA Glitch Rejection
Pin Capacitance
POWER REQUIREMENTS
Supply Voltage
Supply Current
At 3.3 V
At 5.5 V
1 SPS Current
At 3.3 V
At 5.5 V
Shutdown Current
At 3.3 V
At 5.5 V
Power Dissipation Normal Mode
Power Dissipation 1 SPS

Typ

Max

Unit

Test Conditions/Comments−0.05±0.4 2
±0.44
±0.5
±0.5
±0.7
±0.8
±1.0

13

°C
°C
°C
°C
°C
°C
°C
Bits

16

Bits

TA = −40°C to +105°C, VDD = 3.0 V
TA = −40°C to +105°C, VDD = 2.7 V to 3.3 V
TA = −55°C to +125°C, VDD = 3.0 V
TA = −40°C to +105°C, VDD = 2.7 V to 3.6 V
TA = −55°C to +150°C, VDD = 2.7 V to 3.6 V
TA = −40°C to +105°C, VDD = 4.5 V to 5.5 V
TA = −55°C to +150°C, VDD = 2.7 V to 5.5 V
Twos complement temperature value of the sign bit
plus 12 ADC bits (power-up default resolution)
Twos complement temperature value of the sign bit
plus 15 ADC bits (Bit 7 = 1 in the configuration register)

0.06250.0078240
660±0.002±0.015
0.1

°C
°C
ms
ms
ms
°C
°C
°C/V

13-bit resolution (sign + 12-bit)
16-bit resolution (sign + 15-bit)
Continuous conversion and one-shot conversion modes
First conversion on power-up only
Conversion time for 1 SPS mode
Temperature cycle = 25°C to 125°C and back to 25°C
TA = 25°C
TA = 25°C

5
1
0.4

µA
mA
V
V
pF

CT and INT pins pulled up to 5.5 V
VOH = 5.5 V
IOL = 2 mA at 5.5 V, IOL = 1 mA at 3.3 V±1
0.4

VIN = 0 V to VDD

10

µA
V
V
ns
pF

5.5

V

250
300

µA
µA

Peak current while converting, I2C interface inactive
Peak current while converting, I2C interface inactiveµAµA

VDD = 3.3 V, 1 SPS mode, TA = 25°C
VDD = 5.5 V, 1 SPS mode, TA = 25°C

µA
µA
µW
µW

Supply current in shutdown mode
Supply current in shutdown mode
VDD = 3.3 V, normal mode at 25°C
Power dissipated for VDD = 3.3 V, TA = 25°C

0.1

0.7 × VDD
3

0.7 × VDD
50
5
2.7
210
250
46
65
2.0
5.2
700
150

15
25

Input filtering suppresses noise spikes of less than 50 ns

Accuracy includes lifetime drift.
The equivalent 3 σ limits are ±0.33°C. This 3 σ specification is provided to enable comparison with other vendors who use these limits.
3
Based on a floating average of 10 readings.
1
2

Rev. C | Page 3 of 24

ADT7410

Data Sheet

I2C TIMING SPECIFICATIONSTA = −55°C to +150°C, VDD = 2.7 V to 5.5 V, unless otherwise noted. All input signals are specified with rise time (tR) = fall time (tF) = 5 ns
(10% to 90% of VDD) and timed from a voltage level of 1.6 V.
Table 2.
Parameter
SERIAL INTERFACE 1, 2
SCL Frequency
SCL High Pulse Width, tHIGH
SCL Low Pulse Width, tLOW
SCL, SDA Rise Time, tR
SCL, SDA Fall Time, tF
Hold Time (Start Condition), tHD;STA
Setup Time (Start Condition), tSU;STA
Data Setup Time, tSU;DAT

Min
0
0.6
1.3

2

Max

Unit

400

kHz
µs
µs
µs
µs
µs
µs
µs
µs
µs
µs
µs

0.3
0.3
0.6
0.6
0.25
0.35
0.6
0
1.3

Setup Time (Stop Condition), tSU;STO
Data Hold Time, tHD;DAT (Master)Bus-Free Time (Between Stop and Start Condition), tBUF
1

Typ

Test Conditions/Comments
See Figure 2

After this period, the first clock is generated
Relevant for repeated start condition
VDD ≥ 3.0 V
VDD < 3.0 V

Sample tested during initial release to ensure compliance.
All input signals are specified with input rise/fall times = 3 ns, measured between the 10% and 90% points. Timing reference points at 50% for inputs and outputs.
Output load = 10 pF.

Timing Diagram
tLOW

tR

tF

tHD:STASCLtHD:STAtHD:DATtHIGHtSU:STAtSU:DATtSU:STO

tBUF
P

S

S

Figure 2. Serial Interface Timing Diagram

Rev. C | Page 4 of 24

P

06560-002

SDA

Data Sheet

ADT7410ABSOLUTE MAXIMUM RATINGS

1.2

WMAX = (TJMAX − TA2)/θJA
121°C/W
56°C/W
220°C
260°C (0°C)

1.0

0.8

0.6

0.4

0.2
MAX PD = 3.4mW AT 150°C
0

20 sec to 40 sec
3°C/sec maximum−6°C/sec maximum
8 minutes maximum

Values relate to package being used on a standard 2-layer PCB. This gives aworst-case θJA and θJC. See Figure 3 for a plot of maximum power dissipation
vs. ambient temperature (TA).
2
TA = ambient temperature.
3
Junction-to-case resistance is applicable to components featuring apreferential flow direction, for example, components mounted on a heatsink. Junction-to-ambient is more useful for air-cooled, PCB-mounted
components.
1

Stresses at or above those listed under Absolute Maximum
Ratings may cause permanent damage to the product. This is a
stress rating only; functional operation of the product at theseor any other conditions above those indicated in the operational
section of this specification is not implied. Operation beyond
the maximum operating conditions for extended periods may
affect product reliability.

TEMPERATURE (°C)

Figure 3. SOIC_N Maximum Power Dissipation vs. Temperature

ESD CAUTION

Rev. C | Page 5 of 24

06560-003

Rating−0.3 V to +7 V
−0.3 V to VDD + 0.3 V−0.3 V to VDD + 0.3 V−0.3 V to VDD + 0.3 V−0.3 V to VDD + 0.3 V−0.3 V to VDD + 0.3 V
2.0 kV−55°C to +150°C−65°C to +160°C
150°C

–55
–50
–40
–30
–20
–10
0
10
20
30
40
50
60
70
80
90
100
110
120
130
140
150

Parameter
VDD to GND
SDA Voltage to GNDSCL Output Voltage to GND
A0 Input Voltage to GND
A1 Input Voltage to GND
CT and INT Output Voltage to GND
ESD Rating (Human Body Model)
Operating Temperature Range
Storage Temperature Range
Maximum Junction Temperature, TJMAX
8-Lead SOIC-N (R-8)
Power Dissipation1
Thermal Impedance3
θJA, Junction-to-Ambient (Still Air)
θJC, Junction-to-Case
IR Reflow Soldering
Peak Temperature (RoHS-Compliant
Package)Time at Peak TemperatureRamp-Up Rate
Ramp-Down Rate
Time from 25°C to Peak Temperature

MAXIMUM POWER DISSIPATION (W)

Table 3.

ADT7410

Data Sheet

SCL 1
SDA 2

ADT7410

8

VDD

7

GND

A0 3

6 CT
TOP VIEW
A1 4 (Not to Scale) 5 INT

06560-005

PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS

Figure 4. Pin Configuration

Table 4. Pin Function Descriptions
Pin No.
1

Mnemonic
SCL

2

SDA

3
4
5

A0
A1
INT

6

CT

7
8

GND
VDD

Description
I2C Serial Clock Input. The serial clock is used to clock in and clock out data to and from any register ofthe ADT7410. Open-drain configuration. A pull-up resistor is required, typically 10 kΩ.
I2C Serial Data Input/Output. Serial data to and from the part is provided on this pin. Open-drain
configuration. A pull-up resistor is required, typically 10 kΩ.
I2C Serial Bus Address Selection Pin. Logic input. Connect to GND or VDD to set an I2C address.
I2C Serial Bus Address Selection Pin. Logic input. Connect to GND or VDD to set an I2C address.
Overtemperature and Undertemperature Indicator. Logic output. Power-up default setting is as anactive low comparator interrupt. Open-drain configuration. A pull-up resistor is required, typically 10 kΩ.
Critical Overtemperature Indicator. Logic output. Power-up default polarity is active low. Open-drain
configuration. A pull-up resistor is required, typically 10 kΩ.
Analog and Digital Ground.
Positive Supply Voltage (2.7 V to 5.5 V). Decouple the supply with a 0.1 μF ceramic capacitor to
ground.

Rev. C | Page 6 of 24

Data Sheet

ADT7410TYPICAL PERFORMANCE CHARACTERISTICS
1.0

0.30
5.5V CONTINUOUS
CONVERSION

0.25

0.6
MAX ACCURACY LIMITS
0.4

3.0V CONTINUOUS
CONVERSION

0.20

0.2

IDD (mA)

0
–0.2

0.15

0.10

–0.4

5.5V 1SPSMAX ACCURACY LIMITS
–0.6

0.05
3.0V 1SPS

–0.8

–40

–20

0

20

40

60

80

100

120

140

160

TEMPERATURE (°C)

0–10006560-006

–1.0
–60

–50

0

50

100

150

200

TEMPERATURE (°C)

Figure 5. Temperature Accuracy at 3 V

06560-007

TEMPERATURE ERROR (°C)

0.8

Figure 7. Operating Supply Current vs. Temperature

1.0

30

0.8

25
SHUTDOWN IDD (µA)

0.4
0.2
0
–0.2
–0.4

20

15

10

5.5V
5.0V

5

MAX ACCURACY LIMITS

4.5V

–0.8
–1.0
–60

3.3V
3.0V
2.7V

3.6V
–40

–20

0

20

40

60

80

100

120

TEMPERATURE (°C)

140

160

0
–100

–50

0

50

100

150

TEMPERATURE (°C)

Figure 6. Temperature Accuracy at 5 V

Figure 8. Shutdown Current vs. Temperature

Rev. C | Page 7 of 24

20006560-025–0.606560-024

TEMPERATURE ERROR (°C)

MAX ACCURACY LIMITS

0.6

ADT7410

Data Sheet
160

0.30

140

IDD CONTINUOUS CONVERSION

0.25

TEMPERATURE (°C)

120

IDD (mA)

0.20

0.15

0.10

100
80
60
40

IDD 1SPS
0.05

3.0

3.5

4.0

4.5

5.0

5.5

6.0

SUPPLY VOLTAGE (V)006560-008

0
2.5

0

8
7

5
4
3
2
1

3.5

4.0

4.5

5.0

5.5

SUPPLY VOLTAGE (V)6.0

06560-009

SHUTDOWN IDD (µA)

6

3.0

10

15

20

25

30

TIME (Seconds)

Figure 9. Average Operating Supply Current vs. Supply Voltage at 25°C

0
2.5

5

Figure 10. Shutdown Current vs. Supply Voltage at 25°C

Rev. C | Page 8 of 24

Figure 11. Response to Thermal Shock354006560-011

20

Data Sheet

ADT7410

THEORY OF OPERATIONCIRCUIT INFORMATIONTEMPERATURE MEASUREMENT

The ADT7410 is a 13-bit digital temperature sensor thatis extendable to 16 bits for greater resolution. An on-board
temperature sensor generates a voltage proportional to absolutetemperature, which is compared to an internal voltage reference
and input to a precision digital modulator.

In normal mode, the ADT7410 runs an automatic conversion
sequence. During this automatic conversion sequence, a conversion
takes 240 ms to complete and the ADT7410 is continuously
converting. This means that as soon as one temperature conversion
is completed, another temperature conversion begins. Eachtemperature conversion result is stored in the temperature value
registers and is available through the I2C interface. In continuous
conversion mode, the read operation provides the most recent
converted result.

The on-board temperature sensor has excellent accuracy
and linearity over the entire rated temperature range without
needing correction or calibration by the user.
The sensor output is digitized by a Σ-Δ modulator, also known as
the charge balance type analog-to-digital converter. This type of
converter uses time domain oversampling and a high accuracy
comparator to deliver 16 bits of resolution in an extremelycompact circuit.

On power-up, the first conversion is a fast conversion, taking
typically 6 ms. If the temperature exceeds 147°C, the CT pin
asserts low. If the temperature exceeds 64°C, the INT pin asserts
low. Fast conversion temperature accuracy is typically within ±5°C.
The conversion clock for the part is generated internally. No
external clock is required except when reading from andwriting to the serial port.

Configuration register functions consist of







Switching between 13-bit and 16-bit resolution
Switching between normal operation and full power-down
Switching between comparator and interrupt event modeson the INT and CT pins
Setting the active polarity of the CT and INT pins
Setting the number of faults that activate CT and INT
Enabling the standard one-shot mode and 1 SPS mode

The measured temperature value is compared with a criticaltemperature limit (stored in the 16-bit TCRIT setpoint read/write
register), a high temperature limit (stored in the 16-bit THIGH setpoint read/write register), and a low temperature limit (stored in
the 16-bit TLOW setpoint read/write register). If the measured value
exceeds these limits, the INT pin is activated; and if it exceeds the
TCRIT limit, the CT pin is activated. The INT and CT pins areprogrammable for polarity via the configuration register, and the
INT and CT pins are also programmable for interrupt mode via
the configuration register.

CONVERTER DETAILSThe Σ-Δ modulator consists of an input sampler, a summing
network, an integrator, a comparator, and a 1-bit DAC. Thisarchitecture creates a negative feedback loop and minimizes theintegrator output by changing the duty cycle of the comparator
output in response to input voltage changes. The comparator
samples the output of the integrator at a much higher rate than
the input sampling frequency. This oversampling spreads thequantization noise over a much wider band than that of the
input signal, improving overall noise performance andincreasing accuracy.
The modulated output of the comparator is encoded using
a circuit technique that results in I2C temperature data.
Σ-∆ MODULATORINTEGRATORCOMPARATORVOLTAGE REF
AND VPTAT

1-BIT
DAC

LPF DIGITALFILTER

13-BIT

TEMPERATUREVALUEREGISTER

06560-012

1-BIT
CLOCK
GENERATOR

Figure 12. Σ-Δ Modulator
Rev. C | Page 9 of 24

ADT7410

Data Sheet

ONE-SHOT MODE

CT and INT Operation in One-Shot Mode

When one-shot mode is enabled, the ADT7410 immediately
completes a conversion and then goes into shutdown mode. The
one-shot mode is useful when one of the circuit design priorities isto reduce power consumption.

See Figure 13 for more information on one-shot CT pin
operation for TCRIT overtemperature events when one of thelimits is exceeded. Note that in interrupt mode, a read fromany register resets the INT and CT pins.

To enable one-shot mode, set Bits[6:5] of the configuration
register (Register Address 0x03) to 01.

For the INT pin in the comparator mode, if the temperaturedrops below the THIGH − THYST value or goes above the TLOW +THYST value, a write to the one-shot bits (Bit 5 and Bit 6 of theconfiguration register, Register Address 0x03) resets the INT pin.

After writing to the operation mode bits, wait at least 240 ms
before reading back the temperature from the temperature value
register. This delay ensures that the ADT7410 has adequate time
to power up and complete a conversion.
To obtain an updated temperature conversion, reset Bits[6:5] of theconfiguration register (Register Address 0x03) to 01.

1 SPS MODE
In this mode, the part performs one measurement per second.
A conversion takes only 60 ms, and it remains in the idle state
for the remaining 940 ms period. This mode is enabled bywriting 1 to Bit 6 and 0 to Bit 5 of the configuration register(Register Address 0x03).

For the CT pin in the comparator mode, if the temperaturedrops below the TCRIT − THYST value, a write to the one-shot
bits (Bit 5 and Bit 6 of the configuration register, Register
Address 0x03) resets the CT pin. See Figure 13.
Note that when using one-shot mode, ensure that the refresh
rate is appropriate to the application being used.

TEMPERATURE
149°C
148°C
TCRIT

147°C
146°C
145°C
144°C
143°C

TCRIT – THYST

142°C
141°C
140°C

CT PIN
POLARITY = ACTIVE LOWCT PIN
POLARITY = ACTIVE HIGH
TIME

WRITE TO
BIT 5 AND BIT 6 OF
CONFIGURATIONREGISTER.*WRITE TO
BIT 5 AND BIT 6 OF
CONFIGURATIONREGISTER.**THERE IS A 240ms DELAY BETWEEN WRITING TO THE CONFIGURATION REGISTER TO STARTA STANDARD ONE-SHOT CONVERSION AND THE CT PIN GOING ACTIVE. THIS IS DUE TO THE
CONVERSION TIME. THE DELAY IS 60ms IN THE CASE OF A 1 SPS CONVERSION.

Figure 13. One-Shot CT Pin

Rev. C | Page 10 of 24

06560-013

WRITE TO
BIT 5 AND BIT 6 OF
CONFIGURATIONREGISTER.*

Data Sheet

ADT7410SHUTDOWNFAULT QUEUEThe ADT7410 can be placed in shutdown mode by writing 1
to Bit 6 and 1 to Bit 5 of the configuration register (Register
Address 0x03), in which case the entire IC is shut down andno further conversions are initiated until the ADT7410 istaken out of shutdown mode. The ADT7410 can be takenout of shutdown mode by writing 0 to Bit 6 and 0 to Bit 5 in theconfiguration register (Register Address 0x03). The ADT7410
typically takes 1 ms (with a 0.1 µF decoupling capacitor) tocome out of shutdown mode. The conversion result from thelast conversion prior to shutdown can still be read from the
ADT7410 even when it is in shutdown mode. When the part istaken out of shutdown mode, the internal clock is started and aconversion is initiated.

Bit 0 and Bit 1 of the configuration register (Register Address0x03) are used to set up a fault queue. The queue can facilitate up
to four fault events to prevent false tripping of the INT and CT pins
when the ADT7410 is used in a noisy temperature environment.
The number of faults set in the queue must occur consecutively
to set the INT and CT outputs. For example, if the number offaults set in the queue is four, then four consecutive temperature
conversions must occur with each result exceeding a temperature
limit in any of the limit registers before the INT and CT pins areactivated. If two consecutive temperature conversions exceed atemperature limit and the third conversion does not, the fault
count is reset back to zero.

Rev. C | Page 11 of 24

ADT7410

Data SheetTEMPERATURE DATA FORMATTEMPERATURE CONVERSION FORMULAS

One LSB of the ADC corresponds to 0.0625°C in 13-bit mode.
The ADC can theoretically measure a temperature range of
255°C, but the ADT7410 is guaranteed to measure a low value
temperature limit of −55°C to a high value temperature limitof +150°C. The temperature measurement result is stored in
the 16-bit temperature value register and is compared with thehigh temperature limits stored in the TCRIT setpoint register andthe THIGH setpoint register. It is also compared with the lowtemperature limit stored in the TLOW setpoint register.

16-Bit Temperature Data Format

Temperature data in the temperature value register, the TCRIT
setpoint register, the THIGH setpoint register, and the TLOW
setpoint register are represented by a 13-bit twos complement
word. The MSB is the temperature sign bit. The three LSBs, Bit 0
to Bit 2, on power-up, are not part of the temperature conversion result and are flag bits for TCRIT, THIGH, and TLOW. Table 5shows the 13-bit temperature data format without Bit 0 to Bit 2.
The number of bits in the temperature data-word can be extended
to 16 bits, twos complement, by setting Bit 7 to 1 in the configuration register (Register Address 0x03). When using a 16-bit
temperature data value, Bit 0 to Bit 2 are not used as flag bits
and are, instead, the LSB bits of the temperature value. The
power-on default setting has a 13-bit temperature data value.
Reading back the temperature from the temperature value register
requires a 2-byte read. Designers that use a 9-bit temperature
data format can still use the ADT7410 by ignoring the last four
LSBs of the 13-bit temperature value. These four LSBs are Bit 6
to Bit 3 in Table 5.
Table 5. 13-Bit Temperature Data Format
Temperature
−55°C
−50°C
−25°C
−0.0625°C
0°C+0.0625°C
+25°C
+50°C
+125°C+150°C

Digital Output(Binary) Bits[15:3]
1 1100 1001 0000
1 1100 1110 0000
1 1110 0111 0000
1 1111 1111 1111
0 0000 0000 0000
0 0000 0000 0001
0 0001 1001 0000
0 0011 0010 0000
0 0111 1101 0000
0 1001 0110 0000

Digital Output (Hex)0x1C900x1CE00x1E700x1FFF
0x000
0x001
0x190
0x320
0x7D0
0x960

Positive Temperature = ADC Code (dec)/128
Negative Temperature = (ADC Code (dec) − 65,536)/128
where ADC Code uses all 16 bits of the data byte, including thesign bit.
Negative Temperature = (ADC Code (dec) − 32,768)/128
where Bit 15 (sign bit) is removed from the ADC code.

13-Bit Temperature Data Format
Positive Temperature = ADC Code (dec)/16
Negative Temperature = (ADC Code (dec) − 8192)/16
where ADC Code uses the first 13 MSBs of the data byte,
including the sign bit.
Negative Temperature = (ADC Code (dec) − 4096)/16
where Bit 15 (sign bit) is removed from the ADC code.

10-Bit Temperature Data Format
Positive Temperature = ADC Code (dec)/2
Negative Temperature = (ADC Code (dec) − 1024)/2
where ADC Code uses all 10 bits of the data byte, including thesign bit.
Negative Temperature = (ADC Code (dec) − 512)/2
where Bit 9 (sign bit) is removed from the ADC code.

9-Bit Temperature Data Format
Positive Temperature = ADC Code (dec)
Negative Temperature = ADC Code (dec) − 512
where ADC Code uses all nine bits of the data byte, including
the sign bit.
Negative Temperature = ADC Code (dec) − 256
where Bit 8 (sign bit) is removed from the ADC code.

Rev. C | Page 12 of 24

Data Sheet

ADT7410REGISTERSThe ADT7410 contains 14 registers:•
Nine temperature registers•
A status register•
An ID register•
A configuration register•
An address pointer register•
A software reset
All registers are eight bits wide. The temperature value registers,
the status register, and the ID register are read-only. The software
reset is a write-only register. On power-up, the address pointerregister is loaded with 0x00 and points to the temperature value
register MSB.

ADDRESS POINTER REGISTER

Table 6. ADT7410 Registers

The temperature value most significant byte (MSB) and temperature value least significant byte (LSB) registers store thetemperature measured by the internal temperature sensor.
The temperature is stored in twos complement format with
the MSB being the temperature sign bit. When reading fromthese registers, the eight MSBs (Bit 7 to Bit 15) are read firstfrom Register Address 0x00 and then the eight LSBs (Bit 0 toBit 7) are read from Register Address 0x01. Only the temperature
value most significant byte (Register Address 0x00) needs to beloaded into the address pointer register as the address pointerauto-increments to the temperature value least significant byte
address (Register Address 0x01).

Register
Address
0x00
0x01
0x02
0x03
0x04
0x05
0x06
0x07
0x08
0x09
0x0A
0x0B
0x0C
0x0D
0x2E
0x2F

Description
Temperature value most significant byte
Temperature value least significant byte
StatusConfiguration
THIGH setpoint most significant byte
THIGH setpoint least significant byte
TLOW setpoint most significant byte
TLOW setpoint least significant byte
TCRIT setpoint most significant byte
TCRIT setpoint least significant byte
THYST setpoint
ID
Reserved
Reserved
Reserved
Software reset

Power-On
Default
0x00
0x00
0x00
0x00
0x20 (64°C)
0x00 (64°C)
0x05 (10°C)
0x00 (10°C)
0x49 (147°C)
0x80 (147°C)
0x05 (5°C)
0xCX
0xXX
0xXX
0xXX
0xXX

This register is always the first register written to during a write
to the ADT7410. It must be set to the address of the register
to which the write or read transaction is intended. Table 7
shows the register address of each register on the ADT7410.
The default value of the address pointer register is 0x00.
Table 7. Address Pointer Register
P7
ADD7

P6
ADD6

P5
ADD5

P4
ADD4

P3
ADD3

P2
ADD2

P1
ADD1

P0
ADD0

TEMPERATURE VALUE REGISTERS

Bit 0 to Bit 2 are event alarm flags for TCRIT, THIGH, and TLOW. When
the ADC is configured to convert the temperature to a 16-bit
digital value then Bit 0 to Bit 2 are no longer used as flag bits
and are instead used as the LSB bits for the extended digital value.

Table 8. Temperature Value MSB Register (Register Address 0x00)
Bit[14:8]
15

Default Value
0000000
0

Type
R
R

Name
Temp
Sign

Description
Temperature value in twos complement format
Sign bit, indicates if the temperature value is negative or positive

Table 9. Temperature Value LSB Register (Register Address 0x01)
Bit
0Default Value
0

Type
R

Name
TLOW flag/LSB0

1

0

R

THIGH flag/LSB1

2

0

R

TCRIT flag/LSB2

[7:3]

00000

R

Temp

Description
Flags a TLOW event if the configuration register, Register Address 0x03[7] = 0 (13-bit resolution),and if comparator mode is selected through the configuration register, Register Address
0x03[4]. When the temperature value is below TLOW, this bit it set to 1.
Contains the Least Significant Bit 0 of the 15-bit temperature value if the configuration
register, Register Address 0x03[7] = 1 (16-bit resolution).
Flags a THIGH event if the configuration register, Register Address 0x03[7] = 0 (13-bit resolution),and if comparator mode is selected through the configuration register, Register Address
0x03[4]. When the temperature value is above THIGH, this bit it set to 1.
Contains the Least Significant Bit 1 of the 15-bit temperature value if the configuration
register, Register Address 0x03[7] = 1 (16-bit resolution).
Flags a TCRIT event if the configuration register, Register Address 0x03[7] = 0 (13-bit resolution),and if comparator mode is selected through the configuration register, Register Address
0x03[4]. When the temperature value exceeds TCRIT, this bit it set to 1.
Contains the Least Significant Bit 2 of the 15-bit temperature value if the configuration
register, Register Address 0x03[7] = 1 (16-bit resolution).
Temperature value in twos complement format.
Rev. C | Page 13 of 24

ADT7410

Data SheetSTATUS REGISTER
This 8-bit read-only register reflects the status of the overtemperature and undertemperature interrupts that can cause the CT and
INT pins to go active. It also reflects the status of a temperature
conversion operation. The interrupt flags in this register are
reset by a read operation to the status register and/or when
the temperature value returns within the temperature limits,
including hysteresis. The RDY bit is reset after a read from thetemperature value register. In one-shot and 1 SPS modes, theRDY bit is reset after a write to the one-shot bits.

CONFIGURATION REGISTER
This 8-bit read/write register stores various configuration modes
for the ADT7410, including shutdown, overtemperature andundertemperature interrupts, one-shot, continuous conversion,interrupt pins polarity, and overtemperature fault queues.

Table 10. Status Register (Register Address 0x02)
Bit
[3:0]
4

Default Value
0000
0

Type
R
R

Name
Unused
TLOW

5

0

R

THIGH

6

0

R

TCRIT

7

1

R

RDY

Description
Reads back 0.
Set this bit to 1 when the temperature goes below the TLOW temperature limit, and if comparator
mode is selected through the configuration register, Register Address 0x03[4]. The bit clears
to 0 when the status register is read and/or when the temperature measured goes back above
the limit set in the setpoint TLOW + THYST registers.
Set this bit to 1 when the temperature goes above the THIGH temperature limit, and if comparator
mode is selected through the configuration register, Register Address 0x03[4]. The bit clears
to 0 when the status register is read and/or when the temperature measured goes backbelow the limit set in the setpoint THIGH − THYST registers.
Set this bit to 1 when the temperature goes above the TCRIT temperature limit, and if comparator
mode is selected through the configuration register, Register Address 0x03[4]. This bit clears
to 0 when the status register is read and/or when the temperature measured goes backbelow the limit set in the setpoint TCRIT − THYST registers.
This bit goes low when the temperature conversion result is written into the temperature
value register. It is reset to 1 when the temperature value register is read. In one-shot and 1
SPS modes, this bit is reset after a write to the one-shot bits.

Table 11. Configuration Register (Register Address 0x03)
Bit
[1:0]

Default Value
00

Type
R/W

Name
Fault queue

2

0

R/W

CT pin polarity

3

0

R/W

INT pin polarity

4

0

R/W

INT/CT mode

[6:5]

00

R/W

Operation mode

7

0

R/W

Resolution

Description
These two bits set the number of undertemperature/overtemperature faults that canoccur before setting the INT and CT pins. This helps to avoid false triggering due
to temperature noise.
00 = 1 fault (default).
01 = 2 faults.
10 = 3 faults.
11 = 4 faults.
This bit selects the output polarity of the CT pin.
0 = active low.
1 = active high.
This bit selects the output polarity of the INT pin.
0 = active low.
1 = active high.
This bit selects between comparator mode and interrupt mode.
0 = interrupt mode
1 = comparator mode
These two bits set the operational mode for the ADT7410.
00 = continuous conversion (default). When one conversion is finished, theADT7410 starts another.
01 = one shot. Conversion time is typically 240 ms.
10 = 1 SPS mode. Conversion time is typically 60 ms. This operational mode
reduces the average current consumption.
11 = shutdown. All circuitry except interface circuitry is powered down.
This bit sets up the resolution of the ADC when converting.
0 = 13-bit resolution. Sign bit + 12 bits gives a temperature resolution of 0.0625°C.
1 = 16-bit resolution. Sign bit + 15 bits gives a temperature resolution of 0.0078°C.
Rev. C | Page 14 of 24

Data Sheet

ADT7410

THIGH SETPOINT REGISTERS
The THIGH setpoint MSB and THIGH setpoint LSB registers store
the overtemperature limit value. An overtemperature event
occurs when the temperature value stored in the temperature
value register exceeds the value stored in this register. The INT pin
is activated if an overtemperature event occurs. The temperature
is stored in twos complement format with the MSB being thetemperature sign bit.
When reading from this register, the eight MSBs (Bit 15 to Bit 8)
are read first from Register Address 0x04 and then the eight
LSBs (Bit 7 to Bit 0) are read from Register Address 0x05. Only
Register Address 0x04 (THIGH setpoint MSB) needs to be loaded
into the address pointer register as the address pointer autoincrements to Register Address 0x05 (THIGH setpoint LSB).
The default setting for the THIGH setpoint is 64°C.

TLOW SETPOINT REGISTERS
The TLOW setpoint MSB and TLOW setpoint LSB registers store
the undertemperature limit value. An undertemperature event
occurs when the temperature value stored in the temperature
value register is less than the value stored in this register. The
INT pin is activated if an undertemperature event occurs. The
temperature is stored in twos complement format with the MSB
being the temperature sign bit.

When reading from this register, the eight MSBs (Bit 15 to Bit 8)
are read first from Register Address 0x06 and then the eight LSBs
(Bit 7 to Bit 0) are read from Register Address 0x07. Only theRegister Address 0x06 (TLOW setpoint MSB) needs to be loaded
into the address pointer register as the address pointer autoincrements to Register Address 0x07 (TLOW setpoint LSB).
The default setting for the TLOW setpoint is 10°C.

TCRIT SETPOINT REGISTERS
The TCRIT setpoint MSB and TCRIT setpoint LSB registers store
the critical overtemperature limit value. A critical overtemperature
event occurs when the temperature value stored in thetemperature value register exceeds the value stored in thisregister. The CT pin is activated if a critical overtemperature
event occurs. The temperature is stored in twos complement
format with the MSB being the temperature sign bit.
When reading from this register, the eight MSBs (Bit 15 to Bit 8)
are read first from Register Address 0x08 and then the eight
LSBs (Bit 7 to Bit 0) are read from Register Address 0x09. Only
the Register Address 0x08 (TCRIT setpoint MSB) needs to beloaded into the address pointer register as the address pointerauto-increments to Register Address 0x09 (TCRIT setpoint LSB).
The default setting for the TCRIT limit is 147°C.

Table 12. THIGH Setpoint MSB Register (Register Address 0x04)
Bit

Default Value

Type

Name

Description[15:8]

0x20

R/W

THIGH MSB

MSBs of the overtemperature limit, stored in twos complement format.

Table 13. THIGH Setpoint LSB Register (Register Address 0x05)
Bit

Default Value

Type

Name

Description

[7:0]

0x00

R/W

THIGH LSB

LSBs of the overtemperature limit, stored in twos complement format.

Table 14. TLOW Setpoint MSB Register (Register Address 0x06)
Bit

Default Value

Type

Name

Description[15:8]0x05

R/W

TLOW MSB

MSBs of the undertemperature limit, stored in twos complement format.

Table 15. TLOW Setpoint LSB Register (Register Address 0x07)
Bit

Default Value

Type

Name

Description

[7:0]

0x00

R/W

TLOW LSB

LSBs of the undertemperature limit, stored in twos complement format.

Table 16. TCRIT Setpoint MSB Register (Register Address 0x08)
Bit

Default Value

Type

Name

Description[15:8]

0x49

R/W

TCRIT MSB

MSBs of the critical overtemperature limit, stored in twos complement format.

Table 17. TCRIT Setpoint LSB Register (Register Address 0x09)
Bit

Default Value

Type

Name

Description

[7:0]

0x80

R/W

TCRIT LSB

LSBs of the critical overtemperature limit, stored in twos complement format.

Rev. C | Page 15 of 24

ADT7410

Data Sheet

THYST SETPOINT REGISTERID REGISTER

This 8-bit read/write register stores the temperature hysteresis
value for the THIGH, TLOW, and TCRIT temperature limits. The
temperature hysteresis value is stored in straight binary format
using four LSBs. Increments are possible in steps of 1°C from
0°C to 15°C. The value in this register is subtracted from the
THIGH and TCRIT values and added to the TLOW value to implement
hysteresis.

This 8-bit read-only register stores the manufacturer ID in Bit 3
to Bit 7 and the silicon revision in Bit 0 to Bit 2.

Table 18. THYST Setpoint Register (Register Address 0x0A)
Bit

Default Value

Type

Name

Description

[3:0]

0101

R/W

THYST

Hysteresis value, from 0°C to 15°C. Stored in straight binary format. The default setting is 5°C.

[7:4]

0000

R/W

N/A

Not used.

Table 19. ID Register (Register Address 0x0B)
Bit
[2:0]
[7:3]

Default Value
XXX
11001

Type
R
R

Name
Revision ID
Manufacture ID

Description
Contains the silicon revision identification number
Contains the manufacturer identification number

Rev. C | Page 16 of 24

Data Sheet

ADT7410SERIAL INTERFACE
PULL-UP
VDD

VDD
VDD

10kΩ

10kΩ

ADT7410CT
INT

TO INTERRUPT PIN
ON MICROCONTROLLER

A0
A1

PULL-UP
VDD
10kΩ

10kΩ

0.1µF

SCL
SDA
06560-014

PULL-UP
VDD

GND

Figure 14. Typical I2C Interface Connection

Control of the ADT7410 is carried out via the I2C-compatible
serial interface. The ADT7410 is connected to this bus as a slave
and is under the control of a master device.

2.

Figure 14 shows a typical I2C interface connection.

SERIAL BUS ADDRESS
Like all I2C-compatible devices, the ADT7410 has a 7-bit serial
address. The five MSBs of this address for the ADT7410 are set
to 10010. Pin A1 and Pin A0 set the two LSBs. These pins canbe configured two ways, low and high, to give four different
address options. Table 20 shows the different bus address options
available. The recommended pull-up resistor value on the SDA
and SCL lines is 10 kΩ.
Table 20. I2C Bus Address Options
A6
1
1
1
1

A5
0
0
0
0

A4
0
0
0
0

Binary
A3
1
1
1
1

A2
0
0
0
0

3.

4.
A1
0
0
1
1

A0
0
1
0
1

Hex
0x48
0x49
0x4A
0x4B

The serial bus protocol operates as follows:1.

The master initiates data transfer by establishing a start
condition, defined as a high-to-low transition on the serial
data line, SDA, while the serial clock line, SCL, remains
high. This indicates that an address/data stream is going
to follow. All slave peripherals connected to the serial bus
respond to the start condition and shift in the next eight
bits, consisting of a 7-bit address (MSB first) plus a read/
write (R/W) bit. The R/W bit determines whether data is
written to, or read from, the slave device.

The peripheral with the address corresponding to thetransmitted address responds by pulling the data line low
during the low period before the ninth clock pulse, known
as the acknowledge bit. All other devices on the bus thenremain idle while the selected device waits for data to beread from or written to it. If the R/W bit is a 0, the master
writes to the slave device. If the R/W bit is a 1, the masterreads from the slave device.
Data is sent over the serial bus in sequences of nine clock
pulses, eight bits of data followed by an acknowledge bitfrom the receiver of data. Transitions on the data line mustoccur during the low period of the clock signal and remain
stable during the high period as a low-to-high transition when
the clock is high, which can be interpreted as a stop signal.
When all data bytes have been read or written, stop conditions
are established. In write mode, the master pulls the dataline high during the 10th clock pulse to assert a stop
condition. In read mode, the master device pulls the dataline high during the low period before the ninth clock
pulse. This is known as a no acknowledge. The mastertakes the data line low during the low period before the10th clock pulse, then high during the 10th clock pulse toassert a stop condition.

It is not possible to mix read and write in one operation because
the type of operation is determined at the beginning and cannot
subsequently be changed without starting a new operation.

Rev. C | Page 17 of 24

ADT7410

Data Sheet

WRITING DATA

registers in the same write transaction. Writing two bytes ofdata to these registers requires the serial bus address, the dataregister address of the MSB register written to the address
pointer register, followed by the two data bytes written to theselected data register. This is shown in Figure 16.

It is possible to write either a single byte of data or two bytes to
the ADT7410, depending on which registers are to be written.
Writing a single byte of data requires the serial bus address, thedata register address written to the address pointer register,followed by the data byte written to the selected data register.
This is shown in Figure 15.

If more than the required number of data bytes is written to aregister, the register ignores these extra data bytes. To write toa different register, a start or repeated start is required.

For the THIGH setpoint, TLOW setpoint, and TCRIT setpoint
registers, it is possible to write to both the MSB and the LSB
1

9

1

9

SCL

1

0

0

1

SDA

0

A0

A1

P7

R/W

START BY
MASTER

P6

P5

P4

P3

P1

P2

P0
ACK. BY
ADT7410

ACK. BY
ADT7410
FRAME 2ADDRESS POINTER REGISTER BYTE

FRAME 1SERIAL BUS ADDRESS BYTE
19SCL (CONTINUED)

D6

D7

D5

D4

D3

D2

D1

D0
STOP BY
MASTER

ACK. BY
ADT7410
FRAME 3DATA BYTE

06560-016

SDA (CONTINUED)

Figure 15. Writing to a Register Followed by a Single Byte of Data

1

9

1

9

SCL

SDA

1

0

0

1

0

A1

A0

P7

R/W

START BY
MASTER

P6

P5

P4

P3

P2

P1

P0

ACK. BY
ADT7410

ACK. BY
ADT7410

FRAME 1SERIAL BUS ADDRESS BYTE

FRAME 2ADDRESS POINTER REGISTER BYTE

1

9

1

9

SCL (CONTINUED)

D15

D14

D13

D12

D11

D10

D9

D8

D7

D6

D5

D4

D3

D2

ACK. BY
ADT7410
FRAME 3DATA BYTE

Rev. C | Page 18 of 24

D0
ACK. BY
ADT7410

FRAME 4DATA BYTE

Figure 16. Writing to a Register Followed by Two Bytes of Data

D1

STOP BY
MASTER

06560-017

SDA (CONTINUED)

Data Sheet

ADT7410READING DATARESET

Reading data from the ADT7410 is done in a single data byte
operation for the configuration register, the status register,
the THYST register, and the ID register. A two data byte read
operation is needed for the temperature value register, THIGH
setpoint register, TLOW setpoint register, and the TCRIT setpoint
register. Reading back the contents of an 8-bit register similar
to the configuration register is shown in Figure 17. Reading
back the contents of the temperature value register is shownin Figure 18.

To reset the ADT7410 without having to reset the entire I2C bus,
an explicit reset command is provided. This uses a particularaddress pointer word as a command word to reset the part andupload all default settings. The ADT7410 does not respond to
the I2C bus commands (do not acknowledge) during the default
values upload for approximately 200 µs.

Reading back from any register first requires a single-byte write
operation to the address pointer register to set up the address of
the register that is going to be read from. In the case of reading
back from the 2-byte registers, the address pointer automaticallyincrements from the MSB register address to the LSB register
address.

When a master issues a slave address consisting of seven 0s withthe eighth bit (R/W bit) set to 0, this is known as the general calladdress. The general call address is for addressing every device
connected to the I2C bus. The ADT7410 acknowledges thisaddress and reads in the following data byte.

The reset command address word is 0x2F.

GENERAL CALL

If the second byte is 0x06, the ADT7410 is reset, completely
uploading all default values. The ADT7410 does not respondto the I2C bus commands (do not acknowledge) while thedefault values upload for approximately 200 µs.

To read from another register, execute another write to theaddress pointer register to set up the relevant register address.
Thus, block reads are not possible, that is, there is no I2C address
pointer auto-increment except when reading back from a 16-bit
register. If the address pointer register has previously been set
up with the address of the register that is going to receive a readcommand, there is no need to repeat a write operation to set up
the register address again.

The ADT7410 does not acknowledge any other general callcommands.

9

1

1

9

SCL

SDA

1

0

0

1

0

A1

A0

START BY
MASTER

R/W

P7

P6

P5

P4

P3

P2

P1

P0

ACK. BY
ADT7410

ACK. BY
ADT7410

FRAME 1SERIAL BUS ADDRESSBYTEFRAME 2ADDRESS POINTER REGISTER BYTE

1

9

1

9

SCL

REPEAT START
BY MASTER

1

0

0

1

0

A2

FRAME 3SERIAL BUS ADDRESS
BYTE

A0

R/W

D7

D6

ACK. BY
ADT7410

D5

D4

D3

D1

FRAME 4DATA BYTE FROM CONFIGURATIONREGISTER

Figure 17. Reading Back Data from the Configuration Register

Rev. C | Page 19 of 24

D2

D0
NO ACK. BY STOP BY
MASTER MASTER
06560-018

SDA

ADT7410

Data Sheet
1

9

1

9

SCL

SDA
1

0

START

0

1

0

A1

A0

ADT7410 DEVICE ADDRESSACK. BY
ADT7410

1

SR

A7

R/W

A6

A1

A0

REGISTER ADDRESS[A7:A0]

9

ACK. BY
ADT7410

1

9

SCL

1
REPEAT
START

0

A1

A0

ADT7410 DEVICE ADDRESS

R/W
ACK. BY
ADT7410

D7

D6

D1

TEMPERATURE REGISTERMSB DATA

D0
ACK. BY
MASTER

D7

D6

D1

TEMPERATURE REGISTERLSB DATA

D0NO
ACK. BY
MASTERNOTES
1. A START CONDITION AT THE BEGINNING IS DEFINED AS A HIGH-TO-LOW TRANSITION ON SDA WHILE SCLK REMAINS HIGH.
2. A STOP CONDITION AT THE END IS DEFINED AS A LOW-TO-HIGH TRANSITION ON SDA WHILE SCLK REMAINS HIGH.
3. THE MASTER GENERATES THE NO ACKNOWLEDGE AT THE END OF THE READBACK TO SIGNAL THAT IT DOES NOT WANT ADDITIONAL DATA.
4. TEMPERATURE REGISTER MSB DATA AND TEMPERATURE REGISTER LSB DATA ARE ALWAYS SEPARATED BY A LOW ACK BIT.
5. THE R/W BIT IS SET TO A1 TO INDICATE A READBACK OPERATION.

Figure 18. Reading Back Data from the Temperature Value Register

Rev. C | Page 20 of 24

06560-023

SDA

Data Sheet

ADT7410INT AND CT OUTPUTS

Comparator Mode

The INT and CT pins are open-drain outputs, and both pins
require a 10 kΩ pull-up resistor to VDD.

In comparator mode, the INT pin returns to its inactive statuswhen the temperature drops below the THIGH − THYST limit orrises above the TLOW + THYST limit.

UNDERTEMPERATURE AND OVERTEMPERATURE
DETECTION

Putting the ADT7410 into shutdown mode does not reset the
INT state in comparator mode.

The INT and CT pins have two undertemperature/
overtemperature modes: comparator mode and interrupt mode.
The interrupt mode is the default power-up overtemperaturemode. The INT output pin becomes active when the temperatureis greater than the temperature stored in the THIGH setpoint registeror less than the temperature stored in the TLOW setpoint register.
How this pin reacts after this event depends on the overtemperature mode selected.

Interrupt Mode
In interrupt mode, the INT pin only goes inactive when the
ADT7410 register is read, that is, independently, when thetemperature has recovered and gotten back to within the limits
before Point C, as shown in Figure 20. when the INT pin isreset, it only goes active again when the temperature goes froman overtemperature/undertemperature condition back toa temperature within the limits or vice versa.

Figure 19 illustrates the comparator and interrupt modes forevents exceeding the THIGH limit with both pin polarity settings.
Figure 20 illustrates the comparator and interrupt modes forevents exceeding the TLOW limit with both pin polarity settings.

As shown in Figure 19, the INT pin goes active when thetemperature rises beyond the THIGH limit and resets the nexttime any register is read. When reset, it does not go active again
until temperatures decrease back to below THIGH − THYST (Point A),
and when reset, it goes active again when the THIGH/TLOW is
exceeded (Point B).

TEMPERATURE
82°C
81°C

B
THIGH

80°C
79°C
78°C
77°C
76°C
75°C

THIGH – THYST

A

74°C
73°C

INT PIN(COMPARATOR MODE)
POLARITY = ACTIVE LOW
INT PIN(INTERRUPT MODE)
POLARITY = ACTIVE LOW

INT PIN(COMPARATOR MODE)
POLARITY = ACTIVE HIGH

TIME
READ

READ

READ

Figure 19. INT Output Temperature Response Diagram for THIGH Overtemperature Events

Rev. C | Page 21 of 24

06560-020

INT PIN(INTERRUPT MODE)
POLARITY = ACTIVE HIGHADT7410

Data SheetTEMPERATURE
–13°C
–14°C
TLOW + THYST

–15°C
–16°C
–17°C
–18°C
–19°C
–20°C

C

TLOW

–21°C
–22°C

INT PIN(COMPARATOR MODE)
POLARITY = ACTIVE LOW
INT PIN(INTERRUPT MODE)
POLARITY = ACTIVE LOW

INT PIN(COMPARATOR MODE)
POLARITY = ACTIVE HIGH

TIME
READ

READ

READ

06560-021

INT PIN(INTERRUPT MODE)
POLARITY = ACTIVE HIGH

Figure 20. INT Output Temperature Response Diagram for TLOW Undertemperature Events

Rev. C | Page 22 of 24

Data Sheet

ADT7410APPLICATIONS INFORMATIONTHERMAL RESPONSE TIMETEMPERATURE MONITORING

The time required for a temperature sensor to settle to a specified
accuracy is a function of the thermal mass of the sensor andthe thermal conductivity between the sensor and the object
being sensed. Thermal mass is often considered equivalent tocapacitance. Thermal conductivity is commonly specified using
the symbol, Q, and can be thought of as thermal resistance. It
is commonly specified in units of degrees per watt of powertransferred across the thermal joint. The time required forthe part to settle to the desired accuracy is dependent on thethermal contact established in a particular application and theequivalent power of the heat source. In most applications, it isbest to determine the settling time empirically.

The ADT7410 is ideal for monitoring the thermal environment
within electronic equipment. For example, the surface-mounted
package accurately reflects the exact thermal conditions that
affect nearby integrated circuits.

SUPPLY DECOUPLING
Decouple the ADT7410 with a 0.1 µF ceramic capacitor between
VDD and GND. This is particularly important when the ADT7410
is mounted remotely from the power supply. Precision analog
products, such as the ADT7410, require a well-filtered powersource. Because the ADT7410 operates from a single supply, it
might seem convenient to tap into the digital logic power supply.
Unfortunately, the logic supply is often a switch-mode design,
which generates noise in the 20 kHz to 1 MHz range. In addition,
fast logic gates can generate glitches hundreds of millivolts in
amplitude due to wiring resistance and inductance.

The ADT7410 measures and converts the temperature at thesurface of its own semiconductor chip. When the ADT7410 isused to measure the temperature of a nearby heat source, thethermal impedance between the heat source and the ADT7410
must be considered.
When the thermal impedance is determined, the temperatureof the heat source can be inferred from the ADT7410 output. Asmuch as 60% of the heat transferred from the heat source to thethermal sensor on the ADT7410 die is discharged via the copper
tracks, the package pins, and the bond pads. Of the pins on the
ADT7410, the GND pin transfers most of the heat. Therefore, tomeasure the temperature of a heat source, it is recommended
that the thermal resistance between the GND pin of the ADT7410
and the GND of the heat source be reduced as much as possible.

If possible, the power ADT7410 directly from the system power
supply. This arrangement, shown in Figure 21, isolates theanalog section from the logic switching transients. Even if aseparate power supply trace is not available, generous supply
bypassing reduces supply-line induced errors. Local supply
bypassing consisting of a 0.1 µF ceramic capacitor is critical forthe temperature accuracy specifications to be achieved. Thisdecoupling capacitor must be placed as close as possible to the
VDD pin of the ADT7410.

0.1µF

ADT7410POWER
SUPPLY06560-022

TTL/CMOSLOGICCIRCUITS

Figure 21. Use of Separate Traces to Reduce Power Supply Noise

Rev. C | Page 23 of 24

ADT7410

Data SheetOUTLINE DIMENSIONS
5.00 (0.1968)
4.80 (0.1890)

8156.20 (0.2441)
5.80 (0.2284)

41.27 (0.0500)
BSC
0.25 (0.0098)
0.10 (0.0040)
COPLANARITY
0.10
SEATING
PLANE

1.75 (0.0688)
1.35 (0.0532)

0.51 (0.0201)
0.31 (0.0122)

0.50 (0.0196)
0.25 (0.0099)

45°

8°
0°
0.25 (0.0098)
0.17 (0.0067)

1.27 (0.0500)
0.40 (0.0157)

COMPLIANT TO JEDEC STANDARDS MS-012-AA
CONTROLLING DIMENSIONS ARE IN MILLIMETERS; INCH DIMENSIONS(IN PARENTHESES) ARE ROUNDED-OFF MILLIMETER EQUIVALENTS FORREFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN.

012407-A

4.00 (0.1574)
3.80 (0.1497)

Figure 22. 8-Lead Standard Small Outline Package [SOIC_N]
Narrow Body
(R-8)
Dimensions shown in millimeters and (inches)

ORDERING GUIDE
Model1
ADT7410TRZ
ADT7410TRZ-REEL
ADT7410TRZ-REEL7
EVAL-ADT7X10EBZ
1
2

Temperature Range−55°C to +150°C−55°C to +150°C−55°C to +150°C

Temperature Accuracy2±0.5°C±0.5°C±0.5°C

Package Description
8-Lead Standard Small Outline Package [SOIC_N]
8-Lead Standard Small Outline Package [SOIC_N]
8-Lead Standard Small Outline Package [SOIC_N]
Evaluation Board

Z = RoHS Compliant Part.
Maximum accuracy over the −40°C to +105°C temperature range.

I2C refers to a communications protocol originally developed by Philips Semiconductors (now NXP Semiconductors).

©2009–2017 Analog Devices, Inc. All rights reserved. Trademarks andregistered trademarks are the property of their respective owners.
D06560-0-9/17(C)Rev. C | Page 24 of 24

Package Option
R-8
R-8
R-8