GENERAL DESCRIPTION

The ADT74821 is a three-channel digital thermometer and undertemperature/overtemperature alarm for PCs and thermal management systems. It can measure the temperature in two remote locations, such as in the remote thermal diode in a CPU or GPU, or using a discrete diode connected transistor. This device also measures its own ambient temperature.

FEATURES

1 local and 2 remote temperature sensors

0.25°C resolution/1°C accuracy on remote channels

1°C resolution/1°C accuracy on local channel

Automatically cancels up to 1.5 kΩ (typ) of resistance in series with the remote sensors

Extended, switchable temperature measurement range 0°C to +127°C (default) or −55°C to +150°C

2-wire SMBus serial interface with SMBus alert support

Programmable overtemperature/undertemperature limits

Offset registers for system calibration

Up to 2 overtemperature fail-safe THERM outputs

Small, 10-lead MSOP package

240 μA operating current, 5 μA standby current

APPLICATIONS

Desktop and notebook computers

Industrial controllers

Smart batteries

Automotive

Embedded systems

Burn-in applications

Instrumentation