W83793G Datasheet, PDF (57/131 Pages) Winbond – Winbond H/W Monitor

W83793G
MNEMONIC
UpTime.
REGISTER NAME
SmartFan Fan Step Up Time
TYPE
RW
DownTime.
SmartFan Fan Step Down Time
RW
CriticalTemp.
All Fan full speed temperature
RW
TD1FanSelect.
TR2FanSelect.
Temperature to Fan mapping relationships in
SmartFan mode
RW
FanCtrlMode.
TolTD12.
TolTR12.
SmartFan Control Mode Select
RW
Hysteresis tolerance of each temperature source RW
Fan1Nonstop.
Fan Output Nonstop Duty cycle
RW
Fan8Nonstop.
Fan1Start.
Fan8Start.
Fan1StopTime.
Fan8StopTime.
Fan Output Start Duty Cycle
RW
Fan Stop Time from nonstop level to turn off.
RW
Smart Fan Mode is activated on corresponding Fan once users define their relationship with
temperature input in TempFanSelect. Under SmartFan Mode, user can select Thermal Cruise mode
or Smart Fan II mode by assigning FanCtrlMode.
TempFanSelect enables users to arbitrarily define the Temperature-to-Fan relationship. For example,
one can define Thermistor input 1 as chassis temperature sensor, and Temperature 1(Diode Input 1)
as CPU sensor. User can do following manipulation to the Fan1(CPU Fan) and Fan2(System Fan).
Assigning TD1FanSelect 03_HEX and TR1FanSelect 02_HEX, W83793G will associate the system Fan
with CPU sensor and Chassis sensor, but CPU Fan only affects by CPU sensor. More descriptions
can be found at the register definition section for this issue.
Under SmartFan Mode, a specific temperature will be defined in CriticalTemp, when any temperature
input detected temperature higher than this will cause all fan to full speed simultaneously. Beside this,
in normal use several control parameters can be defined in following graph.
- 53 -
Publication Release Date: Dec. 11, 2006
Revision 1.0