Automotive, ±1°C Accurate, 16-Bit, 175°C,

Digital SPI Temperature Sensor in Die Form

Data Sheet

ADT7312

Rev. A

Information furnished by Analog Devices is believed to be accurate and reliable. However, no

responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringementsof patentsorother

rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No

license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781.329.4700

www.analog.com

Fax: 781.461.3113

©2012 Analog Devices, Inc. All rights reserved.

FEATURES

Qualified for automotive applications

High performance

Temperature accuracy:

±1°C from −55°C to +175°C (2.7 V to 3.3 V)

16-bit temperature resolution: 0.0078°C

Fast first temperature conversion on power-up of 6 ms

Easy implementation

No temperature calibration or correction required

No linearity correction required

Low power

Power-saving 1 sample per second (SPS) mode

880 μW typical at 3.6 V in normal mode

9 μW typical at 3.6 V in shutdown mode

Wide operating ranges

Temperature range: −55°C to +175°C

Voltage range: 2.7 V to 5.5 V

Programmable interrupts

Critical overtemperature interrupt

Overtemperature/undertemperature interrupt

SPI-compatible interface

Available in die form only

APPLICATIONS

Automotive

High temperature monitoring

High temperature thermal protection

GENERAL DESCRIPTION

The ADT7312 is a ±1°C accurate digital temperature sensor

that operates over a very wide temperature range of −55°C to

+175°C and is available in die form only. It contains an internal

band gap reference, a temperature sensor, and a 16-bit analog-

to-digital converter (ADC) to monitor and digitize the temper-

ature to a resolution of 0.0078°C. The default ADC resolution

is 13 bits (0.0625°C). The ADC resolution can be changed to

16 bits (0.0078°C) using the serial interface.

The ADT7312 is guaranteed to operate over supply voltages

from 2.7 V to 5.5 V. At 3.6 V operation, the average supply

current is typically 245 μA. The ADT7312 has a shutdown

mode that powers down the device, resulting in a typical

shutdown current of 2.5 μA at 3.6 V. The ADT7312 is rated

for operation over the −55°C to +175°C temperature range.

The CT pin is an open-drain output that becomes active when

the temperature exceeds a programmable critical temperature

limit. The default critical temperature limit is 147°C. The INT

pin is also an open-drain output that becomes active when the

temperature exceeds a programmable limit. The INT pin and

the CT pin can operate in either comparator or interrupt mode.

PRODUCT HIGHLIGHTS

1.

Ease of use, no calibration or correction required.

2.

Low power consumption.

3.

Excellent long-term stability and reliability.

4.

Qualified for automotive applications.

FUNCTIONAL BLOCK DIAGRAM

TEMPERATURE

VALUE

REGISTER

CONFIGURATION

STATUS

REGISTER

ID

REGISTER

REGISTER

REGISTER

REGISTER

REGISTER

REGISTER

INTERNAL

REFERENCE

7

TEMPERATURE

SENSOR

INTERNAL

OSCILLATOR

FILTER

LOGIC

MODULATOR

GND

8

GND

9

10

6

5

CT

INT

3

4

1

2

ADT7312

SCLK

DOUT

DIN

CS

Figure 1.