w83637hg Winbond Electronics Corp America, w83637hg Datasheet - Page 32

• Manufacturer Part Number: w83637hg
• Description: Winbond Lpc I/o Lpc I/o
• Manufacturer: Winbond Electronics Corp America

6.3.1 Monitor over 4.096V voltage
The +12V input voltage can be expressed as following equation.
The value of R1 and R2 can be selected to 28K Ohms and 10K Ohms, respectively, when the input
voltage V1 is 12V. The node voltage of VIN1 can be subject to less than 4.096V for the maximun input
range of the 8-bit ADC.
The -12V input voltage can be expressed as following equation.
The value of R3 and R4 can be selected to 56K Ohms and 232K Ohms, respectively, when the input
voltage V2 is -12V. The node voltage of VIN2 can be subject to less than 4.096V for the maximun input
range of the 8-bit ADC.
The Pin 114 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 W83637HF and the second function is
that this voltage with 5V is connected to internal serial resistors to monitor the +5V voltage. The
W83637HF internal two serial resistors are 34K ohms and 51K ohms so that input voltage to ADC is
3V which is less than 4.096V of ADC maximum input voltage. The express equation can represent as
follows.
6.3.2 CPUVCORE voltage detection method
W83637HF provides two detection methods for CPUVCORE(pin100).
(1). VRM8 method:
this voltage register multiplies 16mV. The formula is as the following:
(2). VRM9 method:
formula is as the following:
The LSB of this mode is 16mV. This means that the detected voltage equals to the reading of
The LSB of this mode is 4.88mV which is especially designed the low voltage CPU. The
Detected Voltage =
Detected Voltage =
VIN
2
Re
Re
=
(
V
ading
ading
V
in
2
−
=
. 3
VCC
where VCC is set to 5V.
∗
∗
VIN
) 6
. 0
. 0
×
016
00488
1
×
R
=
51
3
V
R
+
V
K
1
4
+ 0.7 V
×
R
Ω
51
- 27 -
4
R
+
K
1
+
R
Ω
34
+
3
2
R
, 6 .
K
2
Ω
whereV
≅
3
Publication Release Date: March, 2006
V
2
=
−
12
W83637HF/HG
Revision 1.6