GENERAL DESCRIPTION

The ADT7461A1 is a dual-channel digital thermometer and undertemperature/overtemperature alarm, intended for use in PCs and thermal management systems. It is pin- and registercompatible with the ADM1032 and the ADT7461. A feature of the ADT7461A is series resistance cancellation, where up to 1.5 kΩ (typical) of resistance in series with the temperature monitoring diode can be automatically cancelled from the temperature result, allowing noise filtering. The ADT7461A has a configurable ALERT output and an extended, switchable temperature measurement range.

FEATURES

On-chip and remote temperature sensor

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

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

Automatically cancels up to 1.5 kΩ (typical) of resistance in

series with remote diode to allow noise filtering

Extended, switchable temperature measurement range

0°C to +127°C (default) or –64°C to +191°C

Pin- and register-compatible with ADM1032 and ADT7461

2-wire SMBus serial interface with SMBus alert support

Programmable over/under temperature limits

Offset registers for system calibration

Up to two overtemperature fail-safe THERM outputs

Small 8-lead MSOP

240 μA operating current, 5 μA standby current

APPLICATIONS

Desktop and notebook computers

Industrial controllers

Smart batteries

Automotive

Embedded systems

Burn-in applications

Instrumentation