EMC2103 datasheet(22/85 Pages) MICROCHIP

22 / 85 page

RPM-Based Fan Controller with Hardware Thermal Shutdown

Datasheet

 2013 Microchip Technology Inc.

DS0005250A-page 22

Chapter 5 General Description

The EMC2103 is an SMBus compliant fan controller with one external (EMC2103-2 and EMC2103-4

offer up to three external diode channels) and one 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 (including support of the BJT or transistor model for a CPU diode).

The EMC2103 allows the user to program temperatures generated from external sources to control

the fan speed. This functionality also supports DTS data from the CPU. By pushing DTS or standard

temperature values into dedicated registers, the external temperature readings can be used in

conjunction with the external diode(s) and internal diode to control the fan speed.

The EMC2103 also includes a hardware programmable temperature limit and dedicated system

shutdown output for thermal protection of critical circuitry.

Figure 5.1 shows a system diagram of the EMC2103.

Figure 5.1 System Diagram for EMC2103

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