LG GT500 - GPADC (General Purpose ADC) and AUTOADC2

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Only for training and service purposes
3. TECHNICAL DESCRIPTION
3.4 GPADC (General Purpose ADC) and AUTOADC2
The GPADC consists of a 14 input MUX and an 8-bit ADC. The analog input signal is selected
with the MUX and converted in the ADC.
The GPADC has a built in controller, AUTOADC2, which is able to operate in the background without
software intervention. The AUTOADC2 periodically measures the battery voltage or current. (Fig.2-4-1)
shows the schematic of GPADC part. The GPADC channel spec is as following (Table 2-4-1).
Fig 3-4-1. Schematic of GPADC and AUTOADC2
ADC 2 channels
Resource Name Description
GPA3 PCB_VERSION HW PCB Version check
GPA7 VBACKUP Backup battery
Table 3-4-1. GPADC channel spec
Fig 3-4-2. GPADC and AUTOADC2 Block diagram
GPA2
C9 B8
GPA3
A8
GPA4
C8
GPA5 GPA6
D8
GPA7
B7
GPA0
A9
GPA1
B9
GPA12
C7
TP300
PCB_VERSION
TESTOUT
RTEMP VBACKUP