EMC2104 datasheet(92/101 Pages) SMSC

92 / 101 page

Dual RPM-Based PWM Fan Controller with Hardware Thermal Shutdown

Datasheet

Revision 1.74 (05-08-08)

SMSC EMC2104

DATASHEET

Note: The values shown in Table B.3 are example settings. All the cells in the look-up table are

programmable via SMBus.

Table B.2 Look Up Table Example #1 Configuration

ADDR

SETTING

50h

LUT 1

Configuration

USE_D

TS_F1

USE_D

TS_F2

LUT_L

OCK

TACH /

DRIVE

TEMP3_CFG

[1:0]

TEMP4_CFG

[1:0]

C0h

110

Table B.3 Fan Speed Control Table Example #1

FAN

SPEED

STEP #

EXTERNAL

DIODE 1

TEMPERATURE

(CPU)

EXTERNAL

DIODE 2

TEMPERATURE

(GPU)

EXTERNAL

DIODE 3

TEMPERATURE

(SKIN)

INTERNAL DIODE

TEMPERATURE

(AMBIENT)

FAN DRIVE

SETTINGS

135oC60oC30oC40oC0%

240oC70oC35oC45oC30%

350oC75oC40oC50oC40%

460oC80oC45oC55oC50%

570oC85oC50oC60oC60%

680oC90oC55oC65oC70%

790oC95oC60oC70oC80%

8100oC100oC65oC75oC

100%

Table B.4 Fan Speed Determination for Example #1 (using settings in Table B.3)

EXTERNAL

DIODE 1

TEMPERATURE

(CPU)

EXTERNAL

DIODE 2

TEMPERATURE

(GPU)

EXTERNAL DIODE

3 TEMPERATURE

(SKIN)

INTERNAL DIODE

TEMPERATURE

(AMBIENT)

FAN DRIVE

SETTING RESULT

Example 1:

82°C

48°C

58°C

70% (CPU temp

requires highest drive)

Example 2:

82C°

97°C

62°C

58°C

80% (GPU and Skin

require highest drive)

Example 3:

82°C

97°C

62°C

75°C

100% (Internal temp

requires highest drive)

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