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ADT7481

Analog Devices
Part Number ADT7481
Manufacturer Analog Devices
Description Dual Channel Temperature Sensor and Over Temperature Alarm
Published Nov 13, 2006
Detailed Description www.DataSheet4U.com Dual Channel Temperature Sensor and Over Temperature Alarm ADT7481 FEATURES 1 local and 2 remote te...
Datasheet PDF File ADT7481 PDF File

ADT7481
ADT7481

Overview
www.
DataSheet4U.
com Dual Channel Temperature Sensor and Over Temperature Alarm ADT7481 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 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.
The ADT7481 communicates over a 2-wire serial interface compatible with system management bus (SMBus) standards.
The SMBus address of the ADT7481 is 0x4C.
An ADT7481-1 with an SMBus address of 0x4B is also available.
An ALERT output signals when the on-chip or remote temperature is outside the programmed limits.
The THERM output is a comparator output that allows, for example, on/off control of a cooling fan.
The ALERT output can be reconfigured as a second THERM output if required.
APPLICATIONS Desktop and notebook computers Industrial controllers Smart batteries Automotive Embedded systems Burn-in applications Instrumentation FUNCTIONAL BLOCK DIAGRAM ADDRESS POINTER REGISTER ONE-SHOT REGISTER ON-CHIP TEMP SENSOR CONVERSION RATE REGISTER LOCAL TEMPERATURE THERM LIMIT REGISTER...


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