w83795g Winbond Electronics Corp America, w83795g Datasheet - Page 97
w83795g
Manufacturer Part Number
w83795g
Description
Nuvoton H/w Monitor
Manufacturer
Winbond Electronics Corp America
Datasheet
1.W83795G.pdf
(154 pages)
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10.1.1.3. Thermal Cruise Mode
Thermal Cruise mode is an algorithm to control the fan speed to keep the temperature source around
the TTTI (Target Temperature of Temperature Inputs). If the temperature source detects temperatures
higher or lower than the target temperatures with HT (Hystersis of Temperature), Smart Fan Control will
take actions to speed up or slow down the fan to keep the temperature within the tolerance range.
FANCTL3-FANCTL8 functions are not for W83795ADG.
Thermal Cruise mode controls the fan speed to keep the temperature in a specified range. First, this
range is defined in BIOS by a temperature and the interval (e.g., 55 °C ± 3 °C). As long as the current
temperature remains below the low end of this range (i.e., 52 °C), the fan is off. Once the temperature
exceeds the low end, the fan turns on at a speed defined in BIOS (e.g., 20% output). Thermal Cruise
mode then controls the fan output according to the current temperature. Three conditions may occur:
In general, Thermal Cruise mode means
The following figures illustrate two examples of Thermal Cruise mode.
(1) If the temperature still exceeds the high end, fan output increases slowly. If the fan is operating
at full speed but the temperature still exceeds the high end, a warning message is issued to protect
the system.
(2) If the temperature falls below the high end (e.g., 58°C) but remains above the low end (e.g., 52
°C), fan output remains the same.
(3) If the temperature falls below the low end (e.g., 52 °C), fan output decreases slowly to zero or to
a specified “stop value”. This stop value is enabled by Bank0 Index12h, bits 3 ~ 5, and the value
itself is specified in Bank0 Index08h, Index09h, Index15h and Index 64h. The fan remains at the
stop value for the period of time defined in Bank0 Index0Ch, Index0Dh, Index17h and Index 66h.
•
•
•
•
•
•
•
•
•
if the current temperature is higher than the high end, increase the fan speed;
if the current temperature is lower than the low end, decrease the fan speed;
otherwise, keep the fan speed the same.
The temperature sensor selected by Temperature Source Selection Register (TSS) Bank 2
Address 09
The fan output (FANCTL1 – FANCTL8) selected by Temperature to Fan mapping
Relationships Register (TFMR) Bank2 Address 09
Set the fan output (FANCTL1 – FANCTL8) controlled mode by Fan Control Mode Selection
Registers (FCMS) Bank2 Address 01
Set Critical Temperature to Full Speed all fan (CTFS) Bank2 Address 68
Set Target Temperature of Temperature Inputs (TTTI) Bank2 Address 60
Set Hystersis of Temperature (HT) Bank2 Address 70
HEX
– 0B
HEX
HEX
- 97 –
and 08
HEX
HEX
– 0B
HEX
– 75
HEX
HEX
W83795G/ADG
HEX
HEX
– 6D
– 65
Revision 1.41
Aug/2/2010
HEX
HEX
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