参数资料
型号: W83L786NG
厂商: WINBOND ELECTRONICS CORP
元件分类: 通信及网络
英文描述: SPECIALTY TELECOM CIRCUIT, PDSO20
封装: 0.209 INCH, LEAD FREE, SSOP-20
文件页数: 9/50页
文件大小: 998K
代理商: W83L786NG
W83L786NR/ W83L786NG
- 12 -
7.5.3
Temperature Fault (TEMP_FAULT #)
W83L786NR/NG provides a good protection for temperature fault. Set Pin 2 (TEMP_FAULT#) to
monitor temperature. When D+-D- (Pin12, 11), or VTIN1 (Pin10) temperature exceeds temperature
fault limit in VR35 or VR37, Pin 2 TEMP_FAULT# will be asserted (Figure 6).
Fi g u r e 6 . T E M P_ FA U L T
T EM P _ F A U LT
l i m i t
TEM P _ F A U LT#
7.6 FAN Speed Count and FAN Speed Control
7.6.1
Fan Speed Count
Inputs are provided by the signals from fans equipped with tachometer outputs. The level of these
signals should be set to TTL level, and maximum input voltage cannot be over VCC. 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 in
Figure 7.
Determine the fan counter according to:
Count
RPM
Divisor
=
×
135 106
.
In other words, the fan speed counter has been read from register VR28 or VR29, and the fan speed
can be evaluated by the following equation.
RPM
Count
Divisor
=
×
135 106
.
The default divisor is 2 and defined at CR54.bit0~2, bit4~6 which are three bits for divisor. That
provides very low speed fan counter such as power supply fan. Table 2 is an example for the relation
of divisor, RPM, and count.
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