W83627UHG Nuvoton Technology Corporation of America, W83627UHG Datasheet - Page 42

• Manufacturer Part Number: W83627UHG
• Description: IC I/O CONTROLLER 128-QFP
• Manufacturer: Nuvoton Technology Corporation of America

Specifications of W83627UHG

• Applications: PC's, PDA's
• Interface: LPC
• Voltage - Supply: 3.3V, 5V
• Package / Case: 128-XFQFN
• Mounting Type: Surface Mount
• Pin Count: 128
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

7.3
The eight analog inputs of the hardware monitor block connect to an 8-bit Analog to Digital Converter
(ADC) and consist of four general-purpose inputs connected to external device pins (CPUVCORE,
VIN0 – VIN2) and four internal signals connected to the power supplies (AVCC, VBAT, 5VSB and
5VCC). All inputs are limited to a maximum voltage of 2.048V due to an internal setting of 8mV LSB
(256 steps x 8mV = 2.048V). All inputs to the ADC must limit the maximum voltage by using a voltage
divider. The power supplies have internal resistors, while the external pins require outside limiting
resistors as described 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 measurement
Analog Inputs
Positive Voltage Input
Negative Voltage Input
Figure 7-4 Analog Inputs and Application Circuit of the W83627UHG
10K@25 C, beta=3435K
V2
V0
R THM
CPUVCORE
VIN1
R1
CPUD+
CPUD-
(AGND)
10K, 1%
R
Power Inputs
15K, 1%
R2
R
R3
CAP,2200p
-31-
CPUTIN
SYSTIN
AVCC
VBAT
5VSB
5VCC
AGND
R4
VIN0
Publication Release Date: May 25, 2007
VIN2
VREF
Pin 97
Pin 74
Pin 61
Pin 12
Pin 101
Pin 100
Pin 99
Pin 98
Pin 102
Pin 103
Pin 104
Pin 105
W83627UHG
8-bit ADC
8mV LSB
with
Revision 1.0