Microchip Technology, Inc. EMC2104

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. Additional Features 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