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參數(shù)資料
型號(hào): W83791D
廠(chǎng)商: WINBOND ELECTRONICS CORP
元件分類(lèi): 模擬信號(hào)調(diào)理
英文描述: W83791D Winbond H/W Monitoring IC
中文描述: SPECIALTY ANALOG CIRCUIT, PQFP48
封裝: LQFP-48
文件頁(yè)數(shù): 28/46頁(yè)
文件大小: 636K
代理商: W83791D
W83791D
Preliminary
Publication Release Date: Aug, 2001
Revision 0.41
21
6.7
FAN Speed Count and FAN Speed Control
6.7.1 Fan speed count
W83791D support 5 sets of fan counting. Fan inputs are provided for signals from fans equipped with
tachometer outputs. The level of these signals should be set to TTL level, and the maximum input voltage should not
be over +5.5V. If the input signals from the tachometer outputs are over the VCC, the external trimming circuit
should be added to reduce the voltage to meet the input specification. The normal circuit and trimming circuits are
shown as Figure 8.
Determine the fan counter according to:
.
Divisor
RPM
Count
×
×
=
6
10
35
In other words, if the fan speed counter has been read from register CR[28] or CR[29] or CR[2A] or CR[BA] or
CR[BB] , then the fan speed can be evaluated by the following equation.
.
Divisor
Count
RPM
×
×
=
6
10
35
The default divisor is 2 and defined at CR47.bit7~4, CR4B.bit7~6, and Bank0 CR5D.bit5~7 which are three
bits for divisor. This provides very low speed fan counter such as power supply fan. The followed table is an
example for the relation of divisor, RPM, and count.
Divisor
Nominal RPM
Time
per
Revolution
1
8800
6.82 ms
153
2 (default)
4400
13.64 ms
153
4
2200
27.27 ms
153
8
1100
54.54 ms
153
16
550
109.08 ms
153
32
275
218.16 ms
153
64
137
436.32 ms
153
128
68
872.64 ms
153
Table 2.
Counts
70% RPM
Time for 70%
6160
3080
1540
770
385
192
96
48
9.74 ms
19.48 ms
38.96 ms
77.92 ms
155.84 ms
311.68 ms
623.36 ms
1246.72 ms
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