EMC2113 datasheet(22/85 Pages) SMSC

22 / 85 page

RPM-Based Fan Controller with Multiple Temperature Zones & Hardware Thermal Shutdown

Datasheet

Revision 1.2 (10-08-09)

SMSC EMC2113

DATASHEET

Chapter 6 Product Description

The EMC2113 is an SMBus compliant fan controller with up to three (3) external and one (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 (including support of the BJT or transistor model for a CPU diode).

The EMC2113 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 EMC2113 also allows the user to input a PWM input signal on the PWM_IN pin that is used as

an input to the Fan Speed Control Look Up Table.

The EMC2113 includes a hardware programmable temperature limit and dedicated system shutdown

output for thermal protection of critical circuitry.

Figure 6.1 shows a system diagram of the EMC2113.

Figure 6.1 System Diagram for EMC2113

HO S T

SM Bu s

In te rfa c e

SM DA T A

E M C 2 113

SM C L K

PW M

AL ER T

Fan D riv e

Circ u itry

TA C H

SY S_ SH DN

VD D

1.5V

1.2 k

A DDR_ S E L

O p tion al A n ti-

pa ra lle l D iod e

VD D

PW M _ IN

VD D

DP 1

DN 1

D P 2 / DN3

DN 2 / D P 3

TR IP _ S E T

SH D N _ SEL

VD D

GN D

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