EMC2104 datasheet(21/101 Pages) SMSC

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Dual RPM-Based PWM Fan Controller with Hardware Thermal Shutdown

Datasheet

SMSC EMC2104

Revision 1.74 (05-08-08)

DATASHEET

Chapter 5 Product Description

The EMC2104 is an SMBus compliant fan controller with up to five (up to 4 external and 1 internal)

temperature channels. It contains two fan drivers, both PWM outputs with programmable frequencies.

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 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 for BJT or transistor model for CPU diodes).

The EMC2104 also includes a hardware programmable temperature limit and dedicated system

shutdown output for thermal protection of critical circuitry. Any of the three temperature channels can

be configured to measure a thermistor or voltage channel using a precision reference voltage for

reduced system complexity.

Figure 5.1 shows a system diagram of the EMC2104.

Figure 5.1 System Diagram of EMC2104

EMC2104

DP1*

DN1*

DP2*

DN2*

CPU

Thermal

diode

Thermal

diode

GPU

3.3V

TRIP_SET*

SMCLK

SMDATA

ALERT#

VDD

TACH1

tachometer

PWM1

3.3V

Drive

Circuit

0.8V

1.2k

3.3V

KBC

3.3V

SYS_SHDN#

SHDN_SEL

TACH2*

tachometer

3.3V

Drive

Circuit

32.768KHz Clock

CLK_IN*

PWM2*

DP3 / DN4*

DN3 / DP4*

APD

(optional)

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