ADI’s ADT7320 and ADT7420 are high accuracy digital temperature sensors. They contain 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 and ADT7420 are 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. These devices have a shutdown mode that powers down the device and offers a shutdown current of typically 2.0 μA at 3.3 V. These sensors are 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. The ADT7320 and ADT7420 come in an LFCSP package and are ideal for RTD and thermistor replacement, Industrial control, and medical equipment.