±0.5°C Accurate, 16-Bit

Digital SPI Temperature Sensor

Data Sheet

ADT7310

Rev. A

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FEATURES

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 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

SPI-compatible interface

8-lead narrow SOIC RoHS-compliant package

APPLICATIONS

Medical equipment

Environmental control systems

Computer thermal monitoring

Thermal protection

Industrial process control

Power system monitors

Hand-held applications

GENERAL DESCRIPTION

The ADT7310 is a high accuracy digital temperature sensor

in a narrow 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 0x01).

The ADT7310 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 ADT7310 has a shutdown mode that

powers down the device and offers a shutdown current of

typically 2 μA. The ADT7310 is rated for operation over the

−55°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.

FUNCTIONAL BLOCK DIAGRAM

INTERNAL

REFERENCE

8

7

TEMPERATURE

SENSOR

INTERNAL

OSCILLATOR

FILTER

LOGIC

MODULATOR

GND

6

5

CT

INT

3

4

1

2

ADT7310

CS

TEMPERATURE

VALUE

REGISTER

CONFIGURATION

AND STATUS

REGISTERS

REGISTER

REGISTER

REGISTER

REGISTER

SCLK

DOUT

DIN

Figure 1.