W83L786NR 查看數據表（PDF） - Winbond

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W83L786NR

H/W Monitoring IC

Winbond 

W83L786NR/ W83L786NG

7.4.1 Voltage Input can not be over 2.048V

The input voltage Vcore, and Vram can be expressed as following equation:

VRAM

= V+2.5V

×

R2

R1 + R2

. V+2.5V is +2.5V inputs.

The value of R1 and R2 can be selected to 100K Ohms and 100K Ohms, respectively, when the input

voltage is 2.5V. The node voltage of VRAM can be subject to less than 2.048V for the maximum input

range of the 8-bit ADC. The pin 5 is connected to the power supply VCC with +3.3V. There are two

functions in this pin with 3.3V: the first function is to supply internal analog power of the

W83L786NR/NG and the second function is to connect this pin to internal serial resistors to monitor

the +3.3V voltage. The values of two serial resistors are 20K ohms and 40K ohms so that input

voltage to ADC is 1.1V which is less than 2.048V of ADC maximum input voltage. The express

equation can represent as follows.

Vin

= VCC

×

20KΩ

20KΩ + 40KΩ

≅ 1.1V

where VCC is set to 3.3V.

7.4.2 Voltage Fault (VOLTAGE_FAULT #)

W83L786NR/NG provides a good protection for voltage. Set Pin 20 (VOLTAGE_FAULT#) to monitor

voltage. When Vcore (Pin13), Vram (Pin14), or VCC (Pin5) voltage exceeds high or low voltage limit in

VR2B ~ VR34, Pin 20 VOLTAGE_FAULT# will be asserted (Figure 4).

Voltage High limit

Voltage Low lim it

VOLTAGE_FAULT#

Figure 4. Voltage Fault

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