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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. (Fig.2)
shows the schematic of GPADC part. The GPADC channel spec is as following (Table 2).
WPOWERSENSE
WRFLOOP
JACK_DET
VBACKUP
Figure 3-4-10. Schematic of GPADC and AUTOADC2
Figure 3-4-11. GPADC and AUTOADC2 Block diagram
ADC 6 channels
Resource
GPA0
GPA2
GPA3
GPA4
GPA6
GPA7
ADCSTR
RTEMP
VLOOP
M
U
X
ADSTROBE
Name
RTEMP
VLOOP
WPOWERSENSE
WRFLOOP
GPA6
VBACKUP
Table 3-4-5. GPADC channel spec
A
D
AUTOADC2
Controller
Description
Radio temperature sense
Loop voltage sense
Reference voltage for PAM
Lock inform
Headset detect
Backup battery
- 67 -
3. Technical Brief
B4
MOD1
C7
ADSTR
M10
GPA0
L10
GPA1
K10
GPA2
L11
GPA3
K11
GPA4
J11
GPA6
J10
GPA7
J9
GPA12
D9
GPA13
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