Controller 20-Pin QFN EP T/R

The EMC2105 is an SMBus compliant fan controller withup to five (up to 4 external and 1 internal)temperaturechannels. The fan driver can be operated using twomethods each with two modes. The methods include anRPM based Fan Speed Control Algorithm and a directdrive setting. The temperature monitors offer 1°C accuracy (forexternal diodes) with sophisticated features to reduceerrors introduced by series resistance and beta variationof substrate thermal diode transistors commonly foundin processors. The EMC2105 also includes a hardware programmabletemperature limit and dedicated system shutdownoutput for thermal protection of critical circuitry.

• Programmable Fan Control circuit.
  • 600mA, 5V, High Side Fan Driver
  • 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 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 - Lead Free RoHS compliant (4mm x 4mm)