EMC2104 datasheet(95/101 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

B.3

Example #3

This example uses the RPM based Fan Speed Control Algorithm. The Spin Level (used by the Spin

Up Routine) should be changed to 50% drive for a total Spin Time of 1 second. For all other RPM

configuration settings, the default conditions are used.

For control inputs, it uses the External Diode 1 channel normally, the External Diode 2 channel

normally, and both Pushed Temperature registers in DTS format. The configuration is set as shown in

Table B.8 while Table B.9 shows how the table is loaded.

Note that when using DTS data, the USE_DTS_F1 and / or USE_DTS_F2 bits should be set. The

Pushed Temperature Registers are loaded with the normal DTS values as received by the processor.

When the DTS value is used by the Look Up Table, the value that is stored in the Pushed Temperature

against the Look Up Table thresholds normally. When programming the Look Up Table, it is necessary

to take this translation into account else incorrect settings may be selected.

Table B.8 Look Up Table Example #3 Configuration

ADDR

SETTING

42h

Fan 1

Configuration

EN_

ALGO

RANGE[1:0]

EDGES[1:0]

UPDATE[2:0]

CBh

110

46h

Fan 1 Spin

Configuration

DRIVE_FAIL_CNT

1 [1:0]

NOKICK

SPIN_LVL[2:0]

SPINUP_TIME

[1:0]

0Ah

000

50h

LUT 1

Configuration

USE_D

TS_F1

USE_D

TS_F2

LUT_LO

TACH /

DRIVE

TEMP3_CFG

[1:0]

TEMP4_CFG

[1:0]

EAh

111

Table B.9 Fan Speed Control Table Example #3

FAN

SPEED

STEP #

EXTERNAL DIODE

1 TEMPERATURE

(CPU)

EXTERNAL

DIODE 2

TEMPERATURE

(GPU)

PUSHED

TEMPERATURE

SETTING (DTS1)

PUSHED

TEMPERATURE

SETTING (DTS2)

TACH

TARGET

135oC65oC50oC40oC

3Dh

(1007 RPM)

240oC75oC55oC45oC

1Eh

(2048 RPM)

350oC85oC60oC50oC

14h

(3072 RPM)

460oC90oC65oC55oC

0Fh

(4096 RPM)

570oC95oC70oC60oC

0Ch

(5120 RPM)

680oC

100oC75oC65oC

0Ah

(6144 RPM)

EMC2104 Fiches technique(PDF) 95 Page - SMSC Corporation

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