W83L786NR 查看數據表（PDF） - Winbond

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W83L786NR

H/W Monitoring IC

Winbond 

W83L786NR/ W83L786NG

7.6.2 Fan Speed Control

The W83L786NR/NG provides two sets for PWM/DC fan speed control. The duty cycle of PWM or the

output voltage of DC can be programmed by a 4-bit register. There are four mode to control fan speed

which are set by programming CR80 [3:2] and CR [5:4], and default are FAN_SET mode.

7.6.2.1. Default Fan Speed Setting

There is a pin to set the default value for fan speed control by adjusting external serial resistors. After

power up, the default value will be stored in CR90 (FAN_SET mode). The figure and table are shown

below.

VCC

Ra

FA N _SET

Rb

SECTION

3

2

1

0

FAN SPEED RATE

100﹪

81﹪

62﹪

43﹪

Figure 8 OFFSET Setting

RA

9.1K

4.7K

9.1K

×

RB

×

9.1K

4.7K

9.1K

7.6.2.2. PWM Mode

Duty − cycle(%) = Programmed 4 - bit Register Value ×100%

16

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