EMC2105 datasheet(21/90 Pages) SMSC

21 / 90 page

RPM-Based High Side Fan Controller with Hardware Thermal Shutdown

Datasheet

SMSC EMC2105

Revision 1.72 (11-01-07)

DATASHEET

Chapter 5 Product Description

The EMC2105 is an SMBus compliant fan controller with up to four (up to 4 external) temperature

channels. It contains a single High Side fan driver capable of sourcing up to 600mA from a 5V supply.

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 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 (including support for BJT or transistor model for CPU diodes).

The EMC2105 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 EMC2105.

Figure 5.1 System Diagram of EMC2105

EMC2105

DP1*

DN1*

DP2*

DN2*

CPU

Thermal

diode

Thermal

diode

GPU

3.3V

SMCLK

SMDATA

ALERT#

VDD

TACH1

tachometer

FAN_OUT (2)

3.3V

TRIP_SET*

0.8V

1.2k

3.3V

MCU or

system

controller

VDD_5V (2)

* denotes other functions available on this pin

3.3V

SYS_SHDN#

SHDN_SEL

CLK_IN*

32.768kHz clock

DP3 / DN4*

DN3 / DP4*

APD

(optional)

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