MAX31785

PRODUCTION

6-Channel Intelligent Fan Controller

Intelligent Fan Controller Cost-Effectively Improves System Energy Efficiency and Reliability

Data Sheet (Rev. 3) Product Selection Table
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Overview

  • 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
  • Supports Up to 11 Temperature Sensors
    • Up to Six External Thermal Diodes with Automatic Series Resistance Cancellation
    • One Internal Temperature Sensor
    • Up to Four I²C Digital Temperature Sensors
    • Fault Detection on All Temperature Sensors
  • Available 6-Channel ADC to Measure Remote Voltages
  • PMBus™-Compliant Command Interface
  • I²C/SMBus-Compatible Serial Bus with Bus Timeout Function
  • On-Board Nonvolatile Fault Logging and Default Configuration Setting
  • No External Clocking Required
  • +3.3V Supply Voltage

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. The device can also monitor up to six remote voltages.

Applications

  • Base Stations
  • Industrial Controls
  • Network Switches/Routers
  • Servers
  • Smart Grid Network Systems
MAX31785
6-Channel Intelligent Fan Controller
MAX31785: Typical Operating Circuit
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Documentation

Data Sheet 1

Reliability Data 1

Design Note 1

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Software Resources

Device Drivers 1

Hardware Ecosystem

Parts Product Life Cycle Description
Microcontrollers 1
MAX31782
System Management Microcontroller
Power System Management (PSM) & Sequencers 1
MAX34441
LAST TIME BUY PMBus 5-Channel Power-Supply Manager and Intelligent Fan Controller
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Tools & Simulations

Software Development 1

Evaluation Kits

MAX31785K

Evaluation Kit for the MAX31785

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Features and Benefits

  • Easy Evaluation of the MAX31785
  • USB HID interface
  • Windows XP®- and Windows® 7-Compatible Software
  • RoHS Compliant
  • Proven PCB Layout
  • Fully Assembled and Tested

Product Details

The MAX31785 evaluation kit (EV kit) provides the hardware and software graphical user interface (GUI) necessary to evaluate the MAX31785 6-channel intelligent fan controller. The EV kit includes a MAX31785ETL+ installed, as well as a 12V fan and USB-to-I2C module to communicate with the PC.

Applications

  • Base Stations
  • Industrial Controls
  • Network Switches/Routers
  • Servers
  • Smart Grid Network Systems
MAX31785K
Evaluation Kit for the MAX31785

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