Gpadc(General Purpose Adc) And Autoadc2 - LG KF750 Service Manual

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.3-4-
1) shows the schematic of GPADC part. The GPADC channel spec is as following (Table 3-4-1).
Resource
GPA0
GPA2
GPA3
GPA4
GPA6
GPA7
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Only for training and service purposes
Fig 3-4-1. Schematic of GPADC and AUTOADC2
Fig 3-4-2. GPADC and AUTOADC2 Block diagram
ADC 6 channels
Name
RTEMP
VLOOP
WPOWERSENSE
WRFLOOP
GPA6
VBACKUP
Table 3-4-1. GPADC channel spec
3. TECHNICAL BRIEF
Description
Radio temperature sense
Loop voltage sense
Reference voltage for PAM
Lock inform
Headset detect
Backup battery
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