LG CG225 Service Manual page 33

3. H/W Circuit Description
VRDBB
VRIO
VRMEM
VRRAM
VRABB
VRSIM
VRRTC
3.5.7. ADC Channels
ABB ADC block is composed of 4 internal ADC (Analog to Digital Converter) channels and 4 external
ADC channel. This block operates charging process and other related process by reading battery
voltage and other analog values.
Resource
VCHG
VBAT
ICHG
VBACKUP
ADCIN1
ADCIN2
ADCIN3
ADCIN4
Output Voltage
1.5V
2.8V
2.8V
2.8V
2.8V
2.85V
1.5V
Table 3-7. LDO Output Table
ADC 8 Channels
Name
VCHG
VBAT
ICHG
VBACKUP
ADIC1
BATT_TEMP
TEMPSENSE
HOOK_DETECT
Table 3-8. ADC Channel Spec.
- 32 -
Usage
Digital Core of DBB
Peripheral devices
External memory
LCD & peripheral devices
Analog Block of ABB
SIM card driver
RTC & 32kHz-crystal
Description
Charging Management
Backup Battery
PCB_Revision
Battery Detect
Temperature Sensing
HOOK_DETECT