EMC2104 datasheet(76/101 Pages) SMSC

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Dual RPM-Based PWM Fan Controller with Hardware Thermal Shutdown

Datasheet

Revision 1.74 (05-08-08)

SMSC EMC2104

DATASHEET

Bits 1-0 - TEMP4_CFG[1:0] - These bits determine the temperature channel that is used for the

Temperature 4 inputs to the Look Up Table as shown in Table 6.49.

APPLICATION NOTE: When any of the External Diode 1, External Diode 2, and External Diode 3 channels are

configured to operate as voltage inputs, the voltage data is used in the Look Up Table instead

of the corresponding temperature data. Therefore, the threshold settings must be updated

accordingly. All voltage channels (including VIN1, VIN2, and VIN3) are assumed to be

increasing (i.e. a larger voltage reading indicates a higher fan speed).

6.33

Look Up Table 1 Registers

Table 6.48 TEMP3_CFG Decode

TEMP3_CFG [1:0]

TEMPERATURE CHANNEL USED

External Diode 3 (default)

TRIP_SET / VIN4 Voltage

Pushed Temperature 1 (LUT1)

Pushed Temperature 3 (LUT2)

Reserved

Table 6.49 TEMP4_CFG Decode

TEMP4_CFG [1:0]

TEMPERATURE CHANNEL USED

Internal Diode (default)

External Diode 4

Pushed Temperature 2 (LUT1)

Pushed Temperature 4 (LUT2)

Reserved

Table 6.50 Look Up Table 1 Registers

ADDR

R/W

TACH /

DRIVE

B7B6

B5B4

B3B2

B1B0

DEFAULT

51h

R/W

LUT 1 Drive

Setting 1

‘0’

4096

2048

1024

512

256

128

FBh

‘1’

128

52h

R/W

LUT 1 Ext

Diode 1

Setting 1

7Fh

(127°C)

LUT 1 VIN1

Setting 1

752.9

376.5

188.2

94.12

47.06

23.53

11.76

5.88

7Fh

(0.4V)

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