EMC2104 datasheet(96/101 Pages) SMSC

96 / 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.9 are example settings. All the cells in the look-up table are

programmable via SMBus.

790oC

105oC80oC80oC

09h

(6826 RPM)

8100oC110oC85oC

100oC

08h

(7680 RPM)

Table B.10 Fan Speed Determination for Example #3 (using settings in Table B.9)

EXTERNAL

DIODE 1

TEMPERATURE

(CPU)

EXTERNAL

DIODE 2

TEMPERATURE

(GPU)

PUSHED

TEMPERATURE

(DTS1)

PUSHED

TEMPERATURE

(DTS2)

FAN DRIVE

SETTING RESULT

Example 1:

75°C

35°C

(translated as 65°C)

50°C

(translated as 50°C)

0Ch (5120 RPM) -

CPU requires highest

target

Example 2:

75°C

90°C

15°C

(translated as

85°C)

20°C

(translated as 80°C)

08h (7680 RPM) -

DTS1 requires

highest target

Example 3:

75°C

97.25°C

30°C

(translated as 70°C)

5°C

(translated as

95°C)

09h (6826 RPM) -

DTS2 requires

highest target

Table B.9 Fan Speed Control Table Example #3 (continued)

FAN

SPEED

STEP #

EXTERNAL DIODE

1 TEMPERATURE

(CPU)

EXTERNAL

DIODE 2

TEMPERATURE

(GPU)

PUSHED

TEMPERATURE

SETTING (DTS1)

PUSHED

TEMPERATURE

SETTING (DTS2)

TACH

TARGET

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