W83L786G【PDF 18/57 页】IC H/W MONITOR 28-SSOP

W83L786R/ W83L786G

7.5.3 Temperature Fault (TEMP_FAULT #)

W83L786R/G provides a good protection for temperature fault. Set Pin 28 (TEMP_FAULT#) to monitor

temperature. When D+-D- (Pin16, 15), VTIN1 (Pin14), or VTIN2 (Pin13) temperature exceeds

temperature fault limit in VR35, VR37, or VR39, Pin 28 TEMP_FAULT# will be asserted (Figure 6).

F i g u r e 6 . T E M P _ F A U L T

T E M P _ F A U L T l i m i t

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:

Count

RPM Divisor

=

?/DIV>

135 10

6

.

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

=

?/DIV>

135 10

6

.

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.

Publication Release Date: March 06

- 13 -

Revision0.8

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