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參數資料
| 型號： | W83783S |
| 廠商： | WINBOND ELECTRONICS CORP |
| 元件分類： | 模擬信號調理 |
| 英文描述： | MONITORING IC |
| 中文描述： | SPECIALTY ANALOG CIRCUIT, PDSO24 |
| 封裝： | SOP-24 |
| 文件頁數： | 19/57頁 |
| 文件大小： | 312K |
| 代理商： | W83783S |
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W83783S
Preliminary
Publication Release Date: April 1999
- 14 - Revision 0.55
6.4 FAN Speed Count and FAN Speed Control
6.4.1 Fan speed count
Inputs are provides for signals from fans equipped with tachometer outputs. The level of these signals
should be set to TTL level, and maximum input voltage can 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 obtain the input specification. The normal circuit and trimming circuits are
shown as Figure 13.
Determine the fan counter according to:
Count
RPM Divisor
=
135 10
6
In other words, the fan speed counter has been read from register CR28 or CR29 or CR2A, the fan
speed can be evaluated by the following equation.
RPM
Count
Divisor
=
×
×
135
.
10
6
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. That provides very low speed fan counter such as power supply fan. The
followed table is an example for the relation of divisor, PRM, and count.
Divisor
Nominal
PRM
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 1.
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相關代理商/技術參數 |
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| W83783S_04 | 制造商:WINBOND 制造商全稱:Winbond 功能描述:Monitoring IC |
| W83783S_07 | 制造商:WINBOND 制造商全稱:Winbond 功能描述:Winbond H/W Monitoring IC |
| W83787F | 制造商:WINBOND 制造商全稱:Winbond 功能描述:WINBOND I/O WITH SERIAL-INFRARED SUPPORT |
| W83787IF | 制造商:WINBOND 制造商全稱:Winbond 功能描述:WINBOND I/O WITH SERIAL-INFRARED SUPPORT |
| W83791D | 制造商:WINBOND 制造商全稱:Winbond 功能描述:Winbond H/W Monitoring IC |
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