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參數(shù)資料
型號(hào): W83637HF-AW
廠商: WINBOND ELECTRONICS CORP
元件分類: 外設(shè)及接口
英文描述: LPC I/O
中文描述: MULTIFUNCTION PERIPHERAL, PQFP128
封裝: PLASTIC, QFP-128
文件頁數(shù): 34/149頁
文件大小: 936K
代理商: W83637HF-AW
W83637HF
Publication Release Date: June 25, 2003
- 29 -
Revision 1.3
2N3904
C
E
B
R=30K,1%
C=3300pF
Bipolar Transistor
Temperature Sensor
Pentium II/III
CPU
D+
D-
Therminal
Diode
C=3300pF
R=30K,1%
VREF
SYSTIN
CPUTIN
OR
W83637HF
CPUD-
Figure 6.3
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
6.4.
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.
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