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.

• 4-wire fan compatible
• High speed PWM (26khz)
• Low speed PWM (9.5Hz - 2240Hz)
• Optional detection of aging fans
• 2% accuracy from 500RPM to 16k RPM
• 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
• 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
• 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 Alert compatible
• Available in 20-pin QFN Package - RoHS compliant (4mm x 4mm)
• Notebook Computers
• Embedded Applications
• Projectors
• Industrial and Networking Equipment