w83627ehf Winbond Electronics Corp America, w83627ehf Datasheet - Page 32

• Manufacturer Part Number: w83627ehf
• Description: W83627ehf/ef W83627ehg/eg Winbond Lpc I/o
• Manufacturer: Winbond Electronics Corp America

W83627EHF/EF, W83627EHG/EG
6.3
Analog Inputs
The maximum input voltage of the analog pin is 2.048V because the 8-bit ADC has a 8mV LSB. Really,
the application of the PC monitoring would most often be connected to power suppliers. The CPU
Vcore voltage , battery(pin 74), 3VSB(pin 61), 3VCC(pin 12) , AVCC(pin 114) voltage can directly
connected to these analog inputs. The +12V voltage inputs should be reduced a factor with external
resistors so as to obtain the input range. As Figure 6.2 shows.
Figure 6.2
6.3.1
Monitor over 2.048V voltage
The +12V input voltage can be expressed as following equation.
R
2
VIN
0
V
u
0
R

R
1
2
The value of R1 and R2 can be selected to 56K Ohms and 10K Ohms, respectively, when the input
voltage V
is 12V. The node voltage of VIN0 can be subject to less than 2.048V for the maximum input
0
range of the 8-bit ADC.
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