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LM81 - Serial Interface ACPI-Compatible Microprocessor System

General Description

The LM81 is a highly integrated data acquisition system for hardware monitoring of servers, Personal Computers, or virtually any microprocessor-based system.

In a PC, the LM81 can be used to monitor power supply voltages, temperatures, and fan speeds.

Key Features

  • n Temperature sensing n 6 positive voltage inputs with scaling resistors for monitoring +5V, +12V, +3.3V, +2.5V, Vccp power supplies directly n 8-bit DAC output for controlling fan speed.

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Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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LM81 Serial Interface ACPI-Compatible Microprocessor System Hardware Monitor June 1999 LM81 Serial Interface ACPI-Compatible Microprocessor System Hardware Monitor General Description The LM81 is a highly integrated data acquisition system for hardware monitoring of servers, Personal Computers, or virtually any microprocessor-based system. In a PC, the LM81 can be used to monitor power supply voltages, temperatures, and fan speeds. Actual values for these inputs can be read at any time. Programmable WATCHDOG™ limits in the LM81 activate a fully programmable and maskable interrupt system with two outputs (INT and T_CRIT_). The LM81 has an on-chip digital output temperature sensor with 9-bit or 12-bit resolution, a 6 analog input ADC with 8-bit resolution and an 8-bit DAC.