W83L786NR 查看數據表（PDF） - Winbond

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W83L786NR

H/W Monitoring IC

Winbond 

W83L786NR/ W83L786NG

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).

T E M P _ F A U L T lim it

TEM P_FA U LT#

F ig u re 6 . T E M P _ F A U L T

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:

1.35 × 106

Count = RPM × Divisor

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.

1.35 × 106

RPM = Count × Divisor

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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