W83L785R 데이터 시트보기 (PDF) - Winbond

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W83L785R

Winbond H/W Monitoring IC

Winbond 

W83L785R/W83L785G

+5V

+5V

FAN Out

GND

Pull-up resister

4.7K Ohms

1K~2.7K

Fan Input

Pin 1

Pin 2

10K

W83L785R

Figure 7-3. Fan with Tach Pull-Up to +5V, or Totern-Pole

Output and Register Attenuator

+5V

+5V

FAN Out

GND

FAN

Connector

Pull-up resister < 1K

or totem-pole output

> 1K

Fan Input

Pin 1

Pin 2

3.3V Zener

W83L785R

Figure 7-4. Fan with Tach Pull-Up to +5V, or

Totem-Pole Putput and Zener Clamp

6.6.2 Fan speed control

The W83L785R/G provides two sets for fan PWM speed control. The duty cycle of PWM can be

programmed by an 8-bit register which are defined in the CR81h and CR83h. The default duty cycle is

set to 100%, that is, the default 8-bit registers is set to FFh. The expression of duty can be

represented as follows.

Duty − cycle (%) = Programmed

8 - bit Register Value × 100 %

255

+12V

+5V

PWM Clock Input

R1

R2

D

G

NMOS

S

PNP Transistor

+

C

-

FAN

PWM Clock Input

R1

R2

D

G

NMOS

S

PNP Transistor

+

C

-

FAN

6.7 SMI#

Figure 8

6.7.1 Temperature

Pin SMI# for temperature has 3 modes.

6.7.1.1. Comparator Interrupt Mode

Temperature exceeding TO causes an interrupt and this interrupt will be reset when reading all of the

Interrupt Status Registers. Once an interrupt event has occurred by exceeding TO, then reset, if the

temperature remains above the THYST, the interrupt will occur again when the next conversion has

completed. If an interrupt event has occurred by exceeding TO and not reset, the interrupts will not

occur again. The interrupts will continue to occur in this manner until the temperature goes below

THYST. (Figure 9-1)

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