MAX31790

PRODUCTION

6-Channel PWM-Output Fan RPM Controller

Versatile Fan RPM Controller Can Be Configured for Closed-Loop Control for Up to 6 Fans or Monitoring for Up to 12 Fans

Data Sheet (Rev. 3) Product Selection Table
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Overview

  • Provides Precise Fan Control and Monitoring for Large Fan Count Applications
    • Controls Up to Six Independent Fans with PWM Drive
    • Up to 12 Tachometer Inputs
    • Controlled Duty Cycle Rate-of-Change for Best Acoustics
  • Improves System Reliability
    • Versatile Startup Configurations Provide Reliable Fan Control at Power-up without Having to Wait for System µC Direction
    • I2C Bus Interface with Timeout and Watchdog

The MAX31790 controls the speeds of up to six fans using six independent PWM outputs. The desired fan speeds (or PWM duty cycles) are written through the I²C interface. The outputs drive "4-wire" fans directly, or can be used to modulate the fan's power terminals using an external pass transistor.

Tachometer inputs monitor fan tachometer logic outputs for precise (±1%) monitoring and control of fan RPM as well as detection of fan failure. Six pins are dedicated tachometer inputs. Any of the six PWM outputs can also be configured to serve as tachometer inputs.

The PWM_START inputs select the PWM output status at startup to ensure appropriate fan drive when power is first applied.

To ensure low acoustic impact of fan control, all changes in PWM duty cycle take place at a controlled, programmable rate.

The MAX31790's 3.0V to 5.5V supply voltage range and I²C-compatible interface make it ideal for fan control in a wide range of cooling applications. The MAX31790 is available in a 28-pin TQFN package and operates over the -40°C to +125°C temperature range.

Applications

  • Networking
  • Servers
  • Telecom
MAX31790
6-Channel PWM-Output Fan RPM Controller
MAX31790: Typical Operating Circuit
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Documentation

Data Sheet 1

Reliability Data 1

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Software Resources

Device Drivers 1

Tools & Simulations

Software Development 2

Evaluation Kits

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MAX31790EVKIT

Evaluation Kit for the MAX31790

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Features and Benefits

  • Easy Evaluation of the MAX31790
  • USB HID interface
  • Windows XP®-, Windows Vista®-, and Windows® 7-Compatible Software
  • RoHS Compliant
  • Proven PCB Layout
  • Fully Assembled and Tested

Product Details

The MAX31790 evaluation kit (EV kit) provides the hardware and software graphical user interface (GUI) necessary to evaluate the MAX31790 6-channel PWM-output fan RPM controller. The EV kit includes a MAX31790ATI+ installed, as well as a USB-to-I2C interface.
The USB-to-I2C master section on the EV kit labeled "MAXIM DS3900U HID" can be used to interact with the EV kit software and exercise the device's functionality. The EV kit provides headers and test points to connect user-supplied fans, but does not come with a fan included.

Applications

  • Networking
  • Servers
  • Telecom
MAX31790EVKIT
Evaluation Kit for the MAX31790
MAX31790EVKIT Photo

Latest Discussions

9 Weeks Ago
RPM model Can not been control
15 Weeks Ago
MAX31790 PWM Controller Voltage Question
31 Weeks Ago
Is there a register change sequence and recommended values ​​for switching the MAX31790 from PWM (100%) mode to RPM (1500) mode?
View related discussion on EngineerZone®

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