EMC2104 datasheet(78/101 Pages) SMSC

78 / 101 page

Dual RPM-Based PWM Fan Controller with Hardware Thermal Shutdown

Datasheet

Revision 1.74 (05-08-08)

SMSC EMC2104

DATASHEET

Each temperature (or voltage) channel threshold shares the same hysteresis value. When the

measured temperature for any of the channels meets or exceeds the programmed threshold, the drive

setting associated with that threshold is used. The temperature must drop below the threshold minus

the hysteresis value before the drive setting will be set to the previous value.

APPLICATION NOTE: For proper operation, the hysteresis must be smaller than the difference between two

consecutive thresholds.

If the RPM based Fan Speed Control Algorithm is used, the TACH Target is updated after every

conversion. It is always set to the minimum TACH Target that is stored by the Look Up Table. The fan

drive setting cycle is updated based on the RPM based Fan Speed Control Algorithm configuration

settings.

If the RPM based Fan Speed Control Algorithm is not used, then the fan drive setting is updated after

every conversion. It is set to the maximum duty cycle that is stored by the Look Up Table.

6.34

Look Up Table 2 Registers

Table 6.51 Look Up Table2 Registers

ADDR

R/W

TACH /

DRIVE

B7B6

B5B4B3B2B1B0

DEFAULT

91h

R/W

LUT 2 Drive

Setting 1

‘0’

4096

2048

1024

512

256

128

FBh

‘1’

128

FBh

92h

R/W

LUT 2 Ext

Diode 1

Setting 1

7Fh

(127°C)

LUT2 VIN1

Setting 1

752.9

376.5

188.2

94.12

47.06

23.53

11.76

5.88

7Fh

(0.4V)

93h

R/W

LUT 2 Ext

Diode 2

Setting 1

7Fh

(127°C)

LUT2 VIN2

Setting 1

752.9

376.5

188.2

94.12

47.06

23.53

11.76

5.88

7Fh

(0.4V)

94h

R/W

LUT 2 Temp

3 Setting 1

7Fh

(127°C)

LUT2 Voltage

3 Setting 1

752.9

376.5

188.2

94.12

47.06

23.53

11.76

5.88

7Fh

(0.4V)

95h

R/W

LUT2 Temp 4

Setting 1

7Fh

(127°C)

...

B4h

R/W

LUT 2 Drive

Setting 8

‘0’

4096

2048

1024

512

256

128

92h

‘1’

128

B5h

R/W

LUT 2 Ext

Diode 1

Setting 8

7Fh

(127°C)

LUT2 VIN1

Setting 8

752.9

376.5

188.2

94.12

47.06

23.53

11.76

5.88

7Fh

(0.4V)

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