F71869A
5,400 rpm, 4,800 rpm, 4,200 rpm, and 3,600 rpm (assume the Max Fan Speed is 6,000 rpm).
Figure 9 Stage mode fan control illustration-3
a.Once the temperature is lower than 40°C, the lowest fan speed keeps in 3,600 rpm (60% of full
speed).
b.Once the temperature is higher than 40°C, 50°C and 60°C, the fan speed will vary from 4,200 rpm
to 5,400 rpm and increasing with the temperature level.
c.For the temperature higher than 70°C, the fan speed keeps in the full speed 6,000 rpm.
d.If the hysteresis is set as 3°C (default 4°C), once temperature gets lower than 67°C, the fan speed
would reduce to 5,400 rpm.
Linear auto mode
F71869A also supports linear auto mode. The fan speed would increase or decrease linearly with
the temperature. There are also PWM Duty and RPM% modes for it.
A. Linear auto mode (PWM Duty)
Set the temperature as 70°C, 60°C, 50°C and 40°C and the duty is 100%, 80%, 70%, 60% and
50%.
30
Oct., 2011
V0.19P
FINTEK [ FEATURE INTEGRATION TECHNOLOGY INC. ]
