Microchip Technology, Inc. EMC2105

The EMC2105 is an SMBus compliant fan controller with up to five (up to 4 external and 1 internal) temperature channels. 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 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 EMC2105 also includes a hardware programmable temperature limit and dedicated system shutdown output for thermal protection of critical circuitry. Additional Features Features Programmable Fan Control circuit 600mA, 5V, High Side Fan Driver Optional fan aging detection 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 fan driver Controls fan speed or fan 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 RoHS Compliant Package (4mm x 4mm) Applications Notebook Computers Embedded Applications Projectors Industrial and Networking Equipment