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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.

Key Features

  • 1.
  • 2 Temperature Sensing.
  • 6 Positive Voltage Inputs with Scaling Resistors to Monitor +5V, +12V, +3.3V, +2.5V, Vccp Power Supplies Directly.
  • 8-Bit DAC Output for Controlling Fan Speed.
  • 2 Fan Speed Monitoring Inputs.
  • Chassis Intrusion Detector Input.

📥 Download Datasheet

Datasheet Details

Part number LM81
Manufacturer Texas Instruments
File Size 1.76 MB
Description Serial Interface ACPI-Compatible Microprocessor System Hardware Monitor
Datasheet download datasheet LM81 Datasheet

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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 www.ti.com SNAS011E – JUNE 1999 – REVISED FEBRUARY 2002 LM81 Serial Interface ACPI-Compatible Microprocessor System Hardware Monitor Check for Samples: LM81 FEATURES 1 •2 Temperature Sensing • 6 Positive Voltage Inputs with Scaling Resistors to Monitor +5V, +12V, +3.3V, +2.5V, Vccp Power Supplies Directly • 8-Bit DAC Output for Controlling Fan Speed • 2 Fan Speed Monitoring Inputs • Chassis Intrusion Detector Input • WATCHDOG Comparison of all Monitored Values • SMBus 1.0 (LM81C) and 1.1 (LM81B) Serial Bus Interface Compatibility • LM81B has Improved Voltage Monitoring Accuracy • VID0-VID4 Monitoring Inputs KEY SPECIFICATIONS • Voltage Monitoring Error: +2% or ±1.2% (max) • Temperature Error – −40˚C to +125˚C ± 3˚C (max) • Supply Voltage Range: 2.8V to 3.8V • Supply Current: 0.