W83627EHF Datasheet, PDF (37/141 Pages) Winbond – evolving product from Winbonds most popular I/O family

W83627EHF/EF, W83627EHG/EG
6.5 Smart Fan Control
SMART FAN^TM I：
Smart Fan Control provides two mechanisms. One is Thermal Cruise mode and the other is
Fan Speed Cruise mode. When enable Smart Fan, the Fan output will start from previous setting of
Bank0 Index 01h, Index 03h, Index 11h and Index 61h to increase or decrease.
Pin 103
CPUTIN
Pin 104
SYSTIN
Pin 102
AUXTIN
Pin 115
CPUFanOut0
Pin 116
SYSFanOut
Pin 07
AUXFanOut
Pin 120
CPUFanOut1
6.5.1 Thermal Cruise mode
There are maximum 4 pairs of Temperature/Fan output control at this mode: SYSTIN with
SYSFANOUT, CPUTIN with CPUFANOUT0, AUXTIN with AUXFANOUT and CPUFANOUT1
depends on Bank0 Index 4Ah.bit7~6 setting that is temperature source selection.
W83627EHF/EHG provides the Smart Fan system which can control the fan speed automatically
depend on current temperature to keep it with in a specific range. At first a wanted temperature and
interval must be set (ex. 55 °C ± 3 °C) by BIOS, as long as the real temperature remains below the
setting value, the fan will be off. Once the temperature exceeds the setting high limit temperature
( 58°C), the fan will be turned on with a specific speed set by BIOS (ex: 20% output) and automatically
controlled its output with the temperature varying. Three conditions may occur :
(1) If the temperature still exceeds the high limit (ex: 58°C), Fan output will increase slowly. If the fan
has been operating in its fully speed but the temperature still exceeds the high limit(ex: 58°C), a
warning message will be issued to protect the system.
(2) If the temperature goes below the high limit (ex: 58°C), but above the low limit (ex: 52°C), the fan
speed will be fixed at the current speed because the temperature is in the target area(ex: 52 °C ~
58°C).
(3) If the temperature goes below the low limit (ex: 52°C), Fan output will decrease slowly to 0 until the
temperature exceeds the low limit.
In other words, If “current temperature” > “High Limit”, increase fan speed;
If “current temperature” < “Low Limit”, decrease fan speed;
Otherwise, keep the fan speed.
Publication Release Date: January 18, 2006
-31-
Revision 1.0