±0.25°C Accurate, 16-Bit Digital

SPI Temperature Sensor

Data Sheet

ADT7320

Rev. 0

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FEATURES

High performance

Temperature accuracy

±0.20°C from −10°C to +85°C at 3.0 V

±0.25°C from −20°C to +105°C at 2.7 V to 3.3 V

16-bit temperature resolution: 0.0078°C

Ultralow temperature drift: 0.0073°C

NIST traceable or equivalent

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: −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

16-lead, RoHS-compliant, 4 mm × 4 mm LFCSP package

APPLICATIONS

RTD and thermistor replacement

Thermocouple cold junction compensation

Medical equipment

Industrial control and test

Food transportation and storage

Environmental monitoring and HVAC

Laser diode temperature control

GENERAL DESCRIPTION

The ADT7320 is a high accuracy digital temperature sensor that

offers breakthrough performance over a wide industrial temperature

range, housed in a 4 mm × 4 mm LFCSP package. It contains an

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

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

temperature to a resolution of 0.0078°C. 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 ADT7320 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 ADT7320 has a shutdown mode that powers

down the device and offers a shutdown current of typically 2.0 µA

at 3.3 V. The ADT7320 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 INT pin is also an open-drain output that becomes active

when the temperature exceeds a programmable limit. The INT pin

and CT pin 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. High accuracy for industrial, instrumentation, and medical

applications.

5. Packaged in a 16-lead, RoHS-compliant, 4 mm × 4 mm

LFCSP package.

FUNCTIONAL BLOCK DIAGRAM

INTERNAL

REFERENCE

12

11

TEMPERATURE

SENSOR

INTERNAL

OSCILLATOR

FILTER

LOGIC

MODULATOR

GND

10

9

CT

INT

ADT7320

TEMPERATURE

VALUE

REGISTER

CONFIGURATION

REGISTER

REGISTER

REGISTER

REGISTER

REGISTER

ID

REGISTER

STATUS

REGISTER

1

2

SCLK

DOUT

3

4

DIN

CS

SPI

INTERFACE

Figure 1.