W83L784 데이터 시트보기 (PDF) - Winbond

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W83L784

Winbond H/W Monitoring IC

Winbond 

W83L784R

Preliminary

6.3 Analog Inputs

The maximum input voltage of the analog pin is 4.096V because the 8-bit ADC has a 16mv LSB.

Really, the application of the PC monitoring would most often be connected to power suppliers. The

CPU V-core voltage and +3.3V voltage can directly connected to these analog inputs. The 5VSB and

battery inputs should be reduced a factor with external resistors so as to obtain the input range. As

Figure 10 shows.

Positive Inputs

VIN1(VCORE)

VIN2(+3.3V)

VCC

Pin 16

Pin 14

Pin 20

10V(Battery DC)

R1

VIN3(VBAT)

Pin 13

232K, 1%

R2

99K, 1%

8-bit ADC

with

16mV LSB

Typical Thermister

Connection

**The connections of CPUT2

is same as CPUT1

R

10K, 1%

CPUT1

VREF

RTHM

10K, 25 C

Pin 17

Pin 19

Figure. 10.

6.3.1 Monitor over 4.096V voltage:

The input voltage VIN3 can be expressed as following equation.

VIN 3 = VBAT −DC

×

R2

R1 + R2

The value of R1 and R2 can be selected to 232K Ohms and 99K Ohms, respectively, when the input

voltage VBAT-DC is 10V. The node voltage of VIN3 can be subject to less than 4.096V for the maximun

input range of the 8-bit ADC. The pin 24 is connected to the power supply VCC with +5V. There are

two functions in this pin with 5V. The first function is to supply internal analog power in the W83L784R

and the second function is that this voltage with 5V is connected to internal serial resistors to monitor

the +5V voltage. The value of two serial resistors are 34K ohms and 50K ohms so that input voltage

to ADC is 2.98V which is less than 4.096V of ADC maximum input voltage. The express equation can

represent as follows.

Confidential, For Beta-site Only

-15 -

Publication Release Date: Sep.

1999

Revision 0.54

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