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MAX31785 - 6-Channel Intelligent Fan Controller

General Description

The MAX31785 is a closed-loop multichannel fan controller.

Automatic closed-loop fan control saves system power by operating the fans at the lowest possible speeds.

Added benefits of slower fan speeds include lower audible noise, longer fan life, and reduced system maintenance.

Key Features

  • S Six Independent Channels of Fan Control Supports 3-Wire and 4-Wire Fans Automatic Closed-Loop Fan Speed Control RPM- or PWM-Based Control Optional Manual Mode Control Fast and Slow PWM Frequency Options Staggered Fan Spin-Up Eases Power-Supply Stress Dual Tachometer (12-Fan Support) Fan-Fault Detection Fan-Health Status Meter Nonvolatile Fan Operating Run Time Meter S Supports Up to 11 Temperature Sensors Up to Six External Thermal Diodes with Automatic Series Resis.

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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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www.DataSheet.co.kr 19-5703; Rev 1; 11/11 6-Channel Intelligent Fan Controller General Description The MAX31785 is a closed-loop multichannel fan controller. Automatic closed-loop fan control saves system power by operating the fans at the lowest possible speeds. Added benefits of slower fan speeds include lower audible noise, longer fan life, and reduced system maintenance. Based on a user-programmable lookup table (LUT), the device automatically adjusts the speeds of the six independent fans based on one or more of the 11 available temperature sensors. Alternately, an external host can manually command the fan speeds and the device automatically adjusts the fan speeds. The device contains a fan-health-diagnostic function to help users predict impending fan failures.