GENERAL DESCRIPTION

The ADT7420 is a high accuracy digital temperature sensor offering breakthrough performance over a wide industrial range, housed in an LFCSP 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 to 1 (Register Address 0x03).

FEATURES

Temperature accuracy: ±0.25°C from −20°C to +105°C

13- or 16-bit user selectable temperature-to-digital converter

Low drift silicon temperature sensor

No temperature calibration/correction required by user

Power saving 1 sample per second (SPS) mode

Fast first conversion on power-up of 6 ms

I2C-compatible interface

Operating temperature: −40°C to +150°C

Operating voltage: 2.7 V to 5.5 V

Critical overtemperature indicator

Programmable overtemperature/undertemperature interrupt

Low power consumption: 700 µW typical at 3.3 V

Shutdown mode for lower power: 7 µW typical at 3.3 V

16-lead RoHS-compliant LFCSP package

APPLICATIONS

RTD and thermistor replacement

Medical equipment

Cold junction compensation

Industrial control and test

Food transportation and storage

Environmental monitoring and HVAC