The EMC2104 is an SMBus compliant fan controller with up to five (4 external and 1 internal) temperature channels. The fan drivers can be operated using two methods each with two modes. The methods include an RPM based Fan Speed Control Algorithm and a direct fan 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 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 EMC2104 also includes a hardware programmable temperature limits and dedicated system shutdown output for thermal protection of critical circuitry.

Features

  Two Programmable Fan Control circuits

  4-wire fan compatible

  High speed PWM (26khz)

  Low speed PWM (9.5Hz - 2240Hz)

  Optional detection of aging fans

  RPM based fan control algorithm

  2% accuracy from 500RPM to 16k RPM

  Temperature Look-Up Table

  Allows programmed fan response to temperature

  1 to 4 thermal zones to control each fan driver

  Controls fan speed or drive setting

  Allows externally generated temperature data to control fan drivers including two DTS channels

  Up to Four External Temperature Channels

  Designed to support 45nm, 60nm, and 90nm CPUs

  Automatically detects and supports CPUs requiring the BJT or Transistor models

  Resistance error correction

  1°C accurate (60°C to 100°C)

  0.125°C resolution

  Detects fan aging and variation

  Up to three thermistor compatible voltage inputs

  Hardware Programmable Thermal Shutdown Temperature

  Cannot be altered by software

  60°C to 122°C Range or 92°C to 154°C Range

  Programmable High and Low Limits for all channels

  3.3V Supply Voltage

  SMBus 2.0 Compliant

  SMBus Alert compatible

  Available in 20-pin QFN Package - RoHS compliant (4mm x 4mm)

Applications

  Notebook Computers

  Embedded Applications

  Projectors

  Industrial and Networking Equipment