EMC6D103S datasheet(34/84 Pages) SMSC

34 / 84 page

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

Datasheet

Revision 0.2 (06-14-06)

SMSC EMC6D103S

DATASHEET

Figure 7.1 Automatic Fan Control Flow Diagram

*See Registers 5C-5Eh: PWM Configuration on page 62 for details.

When in Auto Fan Control Operating Mode the hardware controls the fans directly based on monitoring

of temperature and speed.

To control the fans:

Set the minimum temperature that will activate the Automatic Fan control algorithm. This value is

programmed in Registers 67h-69h: Zone x Low Temp Limit (Auto Fan Mode Only).

The speed of the fan is controlled by the duty cycle set for that device. The duty cycle for the minimum

fan speed must be programmed in Registers 64h-66h: PWMx Minimum Duty Cycle. This value

corresponds to the speed of the fan when the temperature reading is equal to the minimum

temperature LIMIT setting. As the actual temperature increases and is above the Zone LIMIT

temperature and below the Absolute Temperature Limit, the PWM will be determined by a linear

function based on the Auto Fan Speed Range bits in Registers 5Fh-61h.

AutoFanMode

Initiated

Temp>=

AbsLimit

(6A~6C)

OverrideallPWM

outputsto100%

dutycycleexceptif

disabledorin

manualmode

Temp>=Low

Limit

(67~69)

Yes

Setfanspeedbasedon

AutoFanRange

Algorithm*

BeginFanSpin-Up

Yes

SetFanOutputto

100%

FanSpinningUp?

SpinUp

TimeElapsed?

(5C-5E)

Yes

BeginPolling

Cycle

EndPollingCycle

EndFanSpinUp

Yes

Setfantomin

PWM

(64~66)

Yes

MinPWM

at0%?

EMC6D103S Datasheet(PDF) 34 Page - SMSC Corporation

EMC6D103S Datasheet(HTML) 34 Page - SMSC Corporation

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