GENERAL DESCRIPTION

The ADT74811 is a 3-channel digital thermometer and under/ over temperature alarm, intended for use in PCs and thermal management systems. It can measure its own ambient temperature or the temperature of two remote thermal diodes. These thermal diodes can be located in a CPU or GPU, or they can be discrete diode connected transistors. The ambient temperature, or the temperature of the remote thermal diode, can be accurately measured to ±1°C. The temperature measurement range defaults to 0°C to +127°C, compatible with ADM1032, but can be switched to a wider measurement range from −64°C to +191°C.

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

Extended, switchable temperature measurement range 0°C to 127°C (default) or –64°C to +191°C

2-wire SMBus serial interface with SMBus ALERT support

Programmable over/under temperature limits

Offset registers for system calibration

Up to 2 over temperature 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