W83627DHG Nuvoton Technology Corporation of America, W83627DHG Datasheet - Page 43

• Manufacturer Part Number: W83627DHG
• Description: IC I/O CONTROLLER 128-QFP
• Manufacturer: Nuvoton Technology Corporation of America

Specifications of W83627DHG

• Applications: PC's, PDA's
• Interface: LPC
• Voltage - Supply: 3.3V
• Package / Case: 128-XFQFN
• Mounting Type: Surface Mount
• Pin Count: 128
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

7.3
The maximum input voltage on analog pins is 2.048 V because the 8-bit ADC has an 8-mV LSB.
Usually, the voltage ports of CPU Vcore (pin 100), battery (pin 74), 3VSB (pin 61), 3VCC (pin 12), and
AVCC (pin 95) can be directly connected to their respective analog pins, as illustrated in the figure
below.
As illustrated in the figure above, other connections may require some external circuits. The rest of this
section provides more information about voltages outside the range of the 8-bit ADC, CPU Vcore
voltage detection, and temperature sensing
7.3.1
Input voltages greater than 2.048 V should be reduced by external resistors to keep the input voltages
in the proper range. For example, input voltage V
VIN0 according to the following equation:
Analog Inputs
Voltages Over 2.048 V or Less Than 0 V
Positive Voltage Input
Negative Voltage Input
10K@25 C, beta=3435K
V0
V1
R
THM
CPUVCORE
VIN2
VIN3
R1
CPUD+
CPUD-
(AGND)
VIN
10K, 1%
R
Power Inputs
15K, 1%
R
0
R2
=
CAP,2200p
V
0
R3
(+12 V) should be reduced before it is connected to
0
-31-
×
R
1
R
AUXTIN
CPUTIN
SYSTIN
+
VREF
2
AVCC
VBAT
3VSB
3VCC
R
2
CPUD-(AGND) Pin 105
VIN0
VIN1
Pin 102
Pin 103
Pin 104
Publication Release Date: Aug, 22, 2007
R4
Pin 95
Pin 74
Pin 61
Pin 12
Pin 100
Pin 99
Pin 97
Pin 96
Pin 98
Pin 101
W83627DHG
8-bit ADC
8mV LSB
with
Version 1.4