EMC6D103 datasheet(72/92 Pages) SMSC

72 / 92 page

Fan Control Device with High Frequency PWM Support and Hardware Monitoring Features

Datasheet

Revision 0.3 (03-01-07)

SMSC EMC6D103

DATASHEET

8.2.20

Registers 67-69h: Zone Low Temperature Limit

These registers become read only when the Lock bit is set. Any further attempts to write to these

registers shall have no effect.

These are the temperature limits for the individual zones. When the current temperature equals this

limit, the fan will be turned on if it is not already. When the temperature exceeds this limit, the fan

speed will be increased according to the auto fan algorithm based on the setting in the Zone x Range

/ PWMx Frequency register. Default = 90

°C=5Ah

Table 8.35 PWM Duty vs. Register Setting

MINIMUM PWM

DUTY

VALUE (DECIMAL)

VALUE (HEX)

00h

25%

40h

50%

128

80h

100%

255

FFh

Table 8.36 Registers 67-69h: Zone Low Temperature Limit

Address

Read/

Write

Bit 7

(MSb)

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

(LSb)

Default

Value

67h

R/W

Zone 1 Low Temp Limit

5Ah

68h

R/W

Zone 2 Low Temp Limit

5Ah

69h

R/W

Zone 3 Low Temp Limit

5Ah

Table 8.37 Temperature Limit vs. Register Setting

LIMIT

LIMIT (DEC)

LIMIT (HEX)

-127

°c-127

81h

-50

°c-50

CEh

°c0

00h

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