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MAX31790 - 6-Channel PWM-Output Fan RPM Controller

Description

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.

Features

  • Provides Precise Fan Control and Monitoring for Large Fan Count.

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Datasheet preview – MAX31790

Datasheet Details

Part number MAX31790
Manufacturer Maxim Integrated
File Size 1.16 MB
Description 6-Channel PWM-Output Fan RPM Controller
Datasheet download datasheet MAX31790 Datasheet
Additional preview pages of the MAX31790 datasheet.

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Full PDF Text Transcription

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MAX31790 EVALUATION KIT AVAILABLE 6-Channel PWM-Output Fan RPM Controller General Description 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 (Q1%) 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.
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