F71882FG datasheet(49/130 Pages) FINTEK

49 / 130 page

May, 2008

V0.28P

-43-

F71882

Linear auto mode

Otherwise, F71882 supports linear auto mode. Below has two examples to describe this

mode. More detail, please refer the register description.

A. Linear auto mode (PWM Duty I)

Set temperature as 70°C, 60°C, 50°C, 40°C and Duty as 100%, 70%, 60%, 50%, 40%

100%

70%

60%

50%

40%

70 Degree C

60 Degree C

50 Degree C

40 Degree C

hysteresis 65 Degree C

Temp.

Fan Speed

PWM duty

a. Once temp. is under 40°C, the lowest fan speed keeps 40% PWM duty

b. Once temp. is over 40°C,50°C,60°C, the fan speed will vary from 40% to 70% PWM duty

and linearly increase with temp. variation. The temp.-fan speed monitoring and flash

interval is 1sec.

c. Once temp. goes over 70°C, fan speed will directly increase to 100% PWM duty (full

speed)

d. If set the hysteresis as 5°C(default is 4°C), once temp reduces under 65°C (not 70°C),

fan speed reduces from 100% PWM duty and decrease linearly with temp..

B. Linear auto mode (RPM%)

Set temperature as 70°C, 60°C, 50°C, 40°C and if full speed is 6000RPM, setting 100%,

70%, 60%, 50%, 40% of full speed.

6000RPM

70%(4200RPM)

60%(3600RPM)

50%(3000RPM)

40%(2400RPM)

70 Degree C

60 Degree C

50 Degree C

40 Degree C

hysteresis 65 Degree C

Temp.

Fan Speed

a. Once temp. is under 40°C, the lowest fan speed keeps 40% of full speed (2400RPM)

b. Once temp. is over 40°C,50°C,60°C, the fan speed will vary from 40% to 70% of full

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