The EMC2303 is an SMBus compliant fan controller with up to three independently controlled PWM fan drivers. Each fan driver is controlled by a programmable frequency PWM driver and Fan Speed Control algorithm that operates in either a closed loop fashion or as a directly PWM-controlled device.

The closed loop Fan Speed Control algorithm (FSC) has the capability to detect aging fans and alert the system. It will likewise detect stalled or locked fans and trigger an interrupt.

Additionally, the EMC2303 offers a clock output so that multiple devices may be chained and slaved to the same clock source for optimal performance in large distributed systems.

Features

  Three Programmable Fan Control circuits

  4-wire fan compatible

  High speed PWM (26 kHz)

  Low speed PWM (9.5Hz - 2240 Hz)

  Optional detection of aging fans

  Fan Spin Up Control and Ramp Rate Control

  Alert on Fan Stall

  Up to 3 Selectable Default Fan Speeds

  Watchdog Timer

  RPM-based fan control algorithm

  0.5% accuracy from 500 RPM to 16k RPM (external crystal oscillator)

  1% accuracy from 500 RPM to 16k RPM (internal clock)

  SMBus 2.0 Compliant

  Up to 6 selectable SMBus addresses

  SMBus Alert compatible

  CLK Pin can provide a clock source output

  Available in a 12-pin 4mm x 4mm QFN RoHS Compliant package

Applications

  Servers

  Projectors

  Industrial and Networking Equipment

  Notebook Computers