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LM85 - Hardware Monitor

General Description

The LM85, hardware monitor, has a two wire digital interface compatible with SMBus 2.0.

the temperature of two remote diode connected transistors as well as its own die the VCCP, 2.5V, 3.3VSBY, 5.0V, and 12V supplies (internal scaling res

Key Features

  • n 2-wire, SMBus 2.0 compliant, serial digital interface n 8-bit Σ∆ ADC n Monitors VCCP, 2.5V, 3.3 VSBY, 5.0V, and 12V motherboard/processor supplies n Monitors 2 remote thermal diodes n Programmable autonomous fan control based on temperature readings.

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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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LM85 Hardware Monitor with Integrated Fan Control March 2003 LM85 Hardware Monitor with Integrated Fan Control General Description The LM85, hardware monitor, has a two wire digital interface compatible with SMBus 2.0. Using an 8-bit Σ∆ ADC, the LM85 measures: – the temperature of two remote diode connected transistors as well as its own die – the VCCP, 2.5V, 3.3VSBY, 5.0V, and 12V supplies (internal scaling resistors). To set fan speed, the LM85 has three PWM outputs that are each controlled by one of three temperature zones. The LM85 includes a digital filter that can be invoked to smooth temperature readings for better control of fan speed. The LM85 has four tachometer inputs to measure fan speed. Limit and status registers for all measured values are included.