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3. TECHNICAL BRIEF
3.4.9 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. Figure
shows the schematic of GPADC part. The GPADC channel spec is as following Table.
ADC 6 channels
Resource
GPA0
GPA2
GPA3
GPA4
GPA6
GPA7
Figure. Schematic of GPADC and AUTOADC2
Figure. GPADC and AUTOADC2 Block diagram
Name
RTEMP
VLOOP
WPOWERSENSE
WRFLOOP
GPA6
VBACKUP
Table. GPADC channel spec
- 64 -
Description
Radio temperature sense
Loop voltage sense
Reference voltage for PAM
Lock inform
Headset detect
Backup battery
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