W83627DHG Datasheet, PDF (60/268 Pages) Winbond – WINBOND LPC I/O

W83627DHG
If the current temperature rises higher than (Target Temperature 1 + Temperature Tolerance), the fan
speed rises one step again, and the target temperature shifts to (Target Temperature 1 + Temperature
Tolerance), or Target Temperature 2. This process repeats whenever the current temperature is higher
than (Target Temperature X ± Temperature Tolerance) or until the fan speed reaches its maximum
speed.
(4) If the current temperature falls below (Target Temperature － Temperature Tolerance), the fan
speed falls one step. The step is the value in the CPUFANOUT Output Value Select Register,
Bank0 Index 03h or Index 61h. In addition, the target temperature shifts to (Target Temperature －
Temperature Tolerance), creating a new target temperature named Target Temperature 1.This is
illustrated in the figure below.
Current Temp. < Target Temp.- Tol.
Fan output
(DC / PWM)
Tolerance
Max. Fan Output
Fan Initial
Output Value
Step
Min. Fan Output
Tar 2
Tar
Tar 3
Tar 1
Temperature
If the current temperature falls lower than (Target Temperature 1 － Temperature Tolerance), the fan
speed is reduced one step again, and the target temperature shifts to (Target Temperature 1 －
Temperature Tolerance), or Target Temperature 2. This process repeats whenever the current
temperature is lower than (Target Temperature X － Temperature Tolerance) or until the fan speed
reaches its minimum speed.
(5) If the current temperature is always lower than (Target Temperature X － Temperature Tolerance),
the fan speed decreases slowly to zero or to a specified stop value. The stop value is enabled by
register Bank0 Index 12h, bit 4 and bit 6, and the stop value is specified in Bank0 Index 09h and
Index 64h. The fan remains at the stop value for the period of time defined in Bank0 Index 0Dh and
Index 66h.
Publication Release Date: Aug, 22, 2007
-48-
Version 1.4