Automotive, ±0.5°C Accurate, 16-Bit

Digital SPI Temperature Sensor

Data Sheet

ADT7311

Rev. 0

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FEATURES

Qualified for automotive applications

High 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 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: −40°C to +150°C

Voltage range: 2.7 V to 5.5 V

Programmable interrupts

Critical overtemperature interrupt

Overtemperature/undertemperature interrupt

SPI-compatible interface

8-lead narrow SOIC RoHS-compliant package

APPLICATIONS

Battery management

Climate control and infotainment

Lighting

Powertrain

Thermocouple cold junction compensation

GPS

GENERAL DESCRIPTION

The ADT7311 is a high accuracy digital temperature sensor

in a narrow 8-lead SOIC package. It contains a band gap

temperature reference and a 16-bit ADC to monitor and digitize

the temperature to a 0.0078°C resolution. The ADC resolution,

by default, is set to 13 bits (0.0625°C). The ADC resolution is a

user programmable mode that can be changed through the

serial interface.

The ADT7311 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 ADT7311 has a shutdown mode that

powers down the device and offers a shutdown current of

typically 2 μA. The ADT7311 is rated for operation over the

−40°C to +150°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 and CT

pins can operate in either comparator or interrupt mode.

PRODUCT HIGHLIGHTS

1.

Ease of use, no calibration or correction required by the user.

2.

Low power consumption.

3.

Excellent long-term stability and reliability.

4.

Packaged in an 8-lead SOIC, RoHS-compliant package.

FUNCTIONAL BLOCK DIAGRAM

INTERNAL

REFERENCE

8

7

TEMPERATURE

SENSOR

INTERNAL

OSCILLATOR

FILTER

LOGIC

MODULATOR

GND

6

5

CT

INT

3

4

1

2

ADT7311

CS

TEMPERATURE

VALUE

REGISTER

CONFIGURATION,

STATUS, AND

ID REGISTERS

REGISTER

REGISTER

REGISTER

REGISTER

SCLK

DOUT

DIN

Figure 1.