参数资料
型号: MON35W42
厂商: STANDARD MICROSYSTEMS CORP
元件分类: 模拟信号调理
英文描述: Hardware Monitoring IC with Thermal Diode Interface
中文描述: SPECIALTY ANALOG CIRCUIT, PQFP48
封装: TQFP-48
文件页数: 11/60页
文件大小: 213K
代理商: MON35W42
19
FIGURE 12
FAN Speed Count and FAN Speed Control
Fan speed count
Fan speed count inputs provide for signals from fans equipped with tachometer outputs. These signals
must be TTL level, and the maximum input voltage can not be over Vcc. If the input signals from the
tachometer outputs are above VCC, the external voltage must be reduced using external components
to obtain the proper input voltage. The normal circuit and trimming circuits are shown in Figure 13.
Determine the fan counter according to:
Count
RPM Divisor
'
(
135 10
6
.
In other words, once 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
D ivisor
'
(
135
10
6
.
The default divisor is 2 and defined in CR47.bit7~4, CR4B.bit7~6, and Bank0 CR5D.bit5~7 which
contain the three bits for the divisor. This provides very low speed fan counter support for fans such as
power supply fan. The followed table is an example for the relation of divisor, RPM, and count.
2N3904
C
E
B
R=30K, 1%
C=3300pF
Bipolar Transistor
Temperature Sensor
Pentium II
CPU
D+
D-
Therminal
Diode
C=3300pF
R=30K, 1%
VREF
PIITDx
OR
MON35W82
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