w83l784r Winbond Electronics Corp America, w83l784r Datasheet - Page 24

• Manufacturer Part Number: w83l784r
• Description: Winbond H/w Monitoring Ic
• Manufacturer: Winbond Electronics Corp America

6.5.3.2 Fan Speed Cruise mode
automatically depend on current fan spesed to keep it with in a specific range. A wanted fan speed
count and interval must be set (ex. 160
range, PWM duty will keep the current value. If current fan speed count is higher than the high limit
(ex. 160+10), PWM duty will be increased to keep the count less than the high limit. Otherwise, if
current fan speed is less than the low limit(ex. 160-10), PWM duty will be decreased to keep the
count higher than the low limit. See Figure 18 example.
Confidential, For Beta-site Only
At this mode, W83L784R provides the Smart Fan system which can control the fan speed
PWM
Duty
Cycle
58`C
55`C
52`C
100
50
0
PWM
Duty
Cycle
58`C
55`C
52`C
Fan Start = 20%
100
50
A
0
Fan Start = 20%
A
10 ) by BIOS. As long as the fan speed count is the specific
Figure 17-1.
Figure 17-2.
B
Fan Stop = 10%
-23 -
C
B
D
C
Fan Start = 20%
Publication Release Date: Sep.
D
W83L784R
Preliminary
Revision 0.54
1999