w83l784r Winbond Electronics Corp America, w83l784r Datasheet - Page 16

• Manufacturer Part Number: w83l784r
• Description: Winbond H/w Monitoring Ic
• Manufacturer: Winbond Electronics Corp America

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.
6.3.1 Monitor over 4.096V voltage:
The input voltage VIN3 can be expressed as following equation.
The value of R1 and R2 can be selected to 232K Ohms and 99K Ohms, respectively, when the input
voltage V
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
BAT-DC
**The connections of CPUT2
is same as CPUT1
is 10V. The node voltage of VIN3 can be subject to less than 4.096V for the maximun
Positive Inputs
Typical Thermister
Connection
VIN
10V(Battery DC)
3
10K, 25 C
R THM
VIN1(VCORE)
VIN2(+3.3V)
V
R
Figure. 10.
-15 -
BAT DC
10K, 1%
232K, 1%
VCC
CPUT1
R1
R
1
R
VIN3(VBAT)
VREF
2
R
R2
99K, 1%
2
Pin 16
Pin 14
Pin 20
Pin 19
Pin 17
Pin 13
Publication Release Date: Sep.
8-bit ADC
16mV LSB
with
W83L784R
Preliminary
Revision 0.54
1999