w83795g Winbond Electronics Corp America, w83795g Datasheet - Page 96

• Manufacturer Part Number: w83795g
• Description: Nuvoton H/w Monitor
• Manufacturer: Winbond Electronics Corp America

10.1.1.2. Speed Cruise Mode
Eight pairs of fan input sensors (FANIN8-FANIN1) and fan outputs (FANCTL8-FANCTL1) in Fan Speed
Cruise mode. FANCTL8-FANCTL1 and FANIN8-FANIN1 mapping are one-by-one relationship.
FANCTL8 is applies to FANIN8. FANCTL7 is applies to FANIN7…etc.
FANCTL3-FANCTL8 functions are not for W83795ADG.
Fan Speed Cruise mode keeps the fan speed in a specified range. First, this range is defined in BIOS
by a fan speed count (the amount of time between clock input signals, not the number of clock input
signals in a period of time) and an interval (e.g., 160 ± 10). As long as the fan speed count is in the
specified range, fan output remains the same. If the fan speed count is higher than the high end (e.g.,
170), fan output increases to make the count lower. If the fan speed count is lower than the low end
(e.g., 150), fan output decreases to make the count higher. One example is illustrated in this figure.
DownTime
FanSpeed
•
•
•
Set the fan output (FANCTL1 – FANCTL8) controlled mode by Fan Control Mode Selection
Registers (FCMS) Bank2 Address 01
Set FANIN Target Speed (FTS) Bank2 Address 40
Set Tolerance of FANIN Target Speed (TFTS) Bank2 Address 50
Count
Smart Fan Lowering
Fan
output
170
160
150
FanSpeed
(%)
100
50
0
Smart Fan Control Parameters Figure
A
StopTime
Mechanism of Fan Speed Cruise
HEX
- 96 –
and 08
C
UpTime
HEX
HEX
Smart Fan Arising Fan
– 4F
HEX
Speed
TM
W83795G/ADG
Mode
HEX
Revision 1.41
Aug/2/2010