The EMC2113 is an SMBus compliant fan controller. The fan driver can be operated using two methods, each with two modes. The methods include an RPM-based Fan Speed Control Algorithm and a direct PWM drive setting. The modes include manually programming the desired settings or using the internal programmable temperature look-up table to select the desired setting based on measured temperature.

The EMC2113 includes a temperature monitor that measures up to three (3) external diodes and the internal diode. The temperature monitors offer 1°C accuracy (for external diodes) with sophisticated features to reduce errors introduced by series resistance and beta variation of substrate thermal diode transistors commonly found in processors.

The device includes high and low limits for all temperature channels as well as a hardware set critical temperature limit. This hardware set limit drives a dedicated system shutdown pin.

Finally, the device includes an open-drain, active low interrupt pin to flag temperature or fan control errors.

Features

  Programmable Fan Control circuit

  4-wire fan compatible

  Both Low and High frequency PWM

  RPM-based fan control algorithm

  2% accurate from 500 RPM to 16k RPM

  Automatic Tachometer feedback

  Temperature Look-Up Table

  Controls fan speed or PWM drive setting

  Eight steps that incorporate up to four temperature zones simultaneously (user selectable)

  Supports forced DTS or standard temperature data

  Allows external PWM input (150Hz to 40kHz)

  Up to Three External Temperature Channels

  Supports transistor model for 90nm - 45nm Intel CPUs

  Resistance Error Correction and Beta Compensation

  1°C accurate (60°C to 125°C)

  0.125°C resolution

  Programmable High and Low limits

  Hardware Programmable Thermal Shutdown Temperature

  Cannot be altered by software

  65°C to 127°C Range

  Dedicated system shutdown interrupt pin

  Internal Temperature Monitor

  ±1°C accuracy

  0.125°C resolution

  3.3V Supply Voltage

  Open drain interrupt pin

  SMBus 2.0 Interface

  SMBus Alert compatible

  Selectable SMBus Address via pull-up resistor and ADDR_SEL pin

  Block Read and Write

  Available in 16-pin 4mm x 4mm QFN RoHS Compliant package

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Applications

  Notebook Computers

  Projectors

  Graphics Cards

  Industrial and Networking Equipment