W83L786R/ W83L786G
DIVISOR
NOMINAL RPM
TIME PER
REVOLUTION
COUNTS
70% RPM
TIME FOR
70%
1
8800
6.82 ms
153
6160
9.74 ms
2 (default)
4400
13.64 ms
153
3080
19.48 ms
4
2200
27.27 ms
153
1540
38.96 ms
8
1100
54.54 ms
153
770
77.92 ms
16
550
109.08 ms
153
385
155.84 ms
32
275
218.16 ms
153
192
311.68 ms
64
137
436.32 ms
153
96
623.36 ms
128
68
872.64 ms
153
48
1246.72 ms
Table 2
FAN Out
+12V
GND
Pull-up resister
4.7K Ohms
+12V
Fan Input
Pin 11
Pin 12
W83L786R
22K~30K
10K
FAN
Connector
FAN Out
+12V
GND
Pull-up resister < 1K
or totem-pole output
+12V
Fan Input
Pin 11
Pin 12
W83L786R
> 1K
Figure 7-2. Fan with Tach Pull-Up to +12V, or
Totem-Pole Putput and Zener Clamp
3.3V Zener
Figure 7-1. Fan with Tach Pull-Up to +12V, or Totern-Pole
Output and Register Attenuator
FAN Out
+5V
GND
Pull-up resister
4.7K Ohms
+5V
Fan Input
Pin 11
Pin 12
W83L786R
1K~2.7K
10K
FAN
Connector
FAN Out
+5V
GND
Pull-up resister < 1K
or totem-pole output
+5V
Fan Input
Pin 11
Pin 12
W83L786R
> 1K
Figure 7-4. Fan with Tach Pull-Up to +5V, or
Totem-Pole Putput and Zener Clamp
3.3V Zener
Figure 7-3. Fan with Tach Pull-Up to +5V, or Totern-Pole
Output and Register Attenuator
Publication Release Date: March 06
- 14 -
Revision0.8