The EMC2103 is an SMBus compliant fan controller with up to up to 3 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 PWM 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 EMC2103 also includes a hardware programmable temperature limit and dedicated system shutdown output for thermal protection of critical circuitry.

Features

  Programmable Fan Control circuit

  4-wire fan compatible

  High and low frequency PWM

  RPM based fan control algorithm

  2.5% accuracy from 500RPM to 16k RPM

  Detects fan aging and variation

  Temperature Look-Up Table

  Allows programmed fan response to temperature

  Controls fan speed or PWM drive setting

  Allows externally set temperature data to drive fan

  Supports DTS data from CPU

  Up to Three External Temperature Channels (EMC2103-2 only)

  Supports 45nm, 60nm, and 90nm CPU diodes

  Automatically detects and supports CPUs requiring BJT or Transistor models

  Resistance error correction

  Supports discrete transistors (i.e. 2N3904)

  1°C accurate (60°C to 125°C)

  0.125°C resolution

  Hardware Programmable Thermal Shutdown Temperature

  Cannot be altered by software

  65°C to 127°C Range

  Programmable High and Low Limits for all channels

  Internal Temperature Monitor

  2°C accuracy

  0.125°C resolution

  3.3V Supply Voltage

  SMBus 2.0 Compliant

  SMBus Alert compatible

  Two dedicated GPIOs (EMC2103-2 and EMC2103-4 only)

  Available in 12-pin, QFN RoHS Compliant Package (EMC2103-1) or 16-pin, QFN RoHS Compliant Package (EMC2103-2 and EMC2103-4)

Applications

  Notebook Computers

  Projectors

  Graphics Cards

  Industrial and Networking Equipment