F81866A
Fig 6-10 Linear mode fan control illustration
a. Once the temperature is lower than 40°C, the lowest fan speed keeps in the 50% PWM duty
b. Once the temperature becomes higher than 40°C, 50°C and 60°C, the fan speed will vary from
50% to 80% PWM duty linearly with the temperature variation. The temp.-fan speed monitoring
flash interval is 1sec.
c. Once the temperature goes over 70°C, the fan speed will directly increase to 100% PWM duty
(full speed).
d. If set the hysteresis is 5°C (default is 4°C), once the temperature becomes lower than 65°C
(instead of 70°C), the fan speed will reduce from 100% PWM duty and decrease linearly with the
temperature.
B. Linear auto mode (RPM%)
Set the temperature as 70°C, 60°C, 50°C, 40°C and the corresponding fan speed is 6,000 RPM,
4,800 RPM, 4,200 RPM, 3,600 RPM and 3,000 RPM (assume the Max Fan Speed is 6,000 RPM).
41
Jan, 2012
V0. 12P
FINTEK [ FEATURE INTEGRATION TECHNOLOGY INC. ]
