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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).
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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
Resource Name
Description
GPA0
RTEMP
Radio temperature sense
GPA2
VLOOP
Loop voltage sense
GPA3
WPOWERSENSE
Reference voltage for PAM
GPA4 WRFLOOP
Lock
inform
GPA6 GPA6
Headset
detect
GPA7 VBACKUP
Backup
battery
Table 3-4-1. GPADC channel spec
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