LG KE520 Service Manual page 34

3.4.4 Monitoring ADC
The monitoring ADC (MADC) consists of a 10-bit analog-to-digital converter (ADC) combined with an
11- input analog multiplexer. The ADC implementation consists of a successive approximation
conversion.
Five of the eleven inputs are available externally (ADIN1..5), and the remaining six inputs are
dedicated to die temperature measurement, main battery voltage, backup battery voltage, charger
voltage, charger current monitoring and USB Vbus voltage. Three external inputs (ADIN1..3) are
standard inputs. The two others (ADIN4..5) which are associated with current sources, are intended
for battery temperature and battery type measurements.
ADC 8 channels
Resource
VCHG
VBAT
ICTL
ADIN1
ADIN2
ADIN3
ADIN4
ADIN5
3.4.5 Switch ON/OFF
KE520 Power State : Defined 4cases as follow
- Power-ON : mobile is powered by main battery or backup battery.
- Power-OFF : mobile isn't any battery.
- Switch-ON : mobile is powered and waken up from switch-off state.
- Switch-OFF : mobile is powered to maintain only the permanent function(ULPD).
To enter into Switch-ON state, one of following 4 condition is satisfied.
- PWR-ON pushed after a debouncing time of 30ms.
- ON_REMOTE : After debouncing, when a falling edgeis detected on RPWON pin.
- IT_WAKE_UP : When a rising edge is detected on RTC_ALARM pin.
- CHARGER_IC :When a charger voltage is above VBAT+0.4V on VCHG.
Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Name
VCHG
VBAT
ICTL
TEMP_SENSE
JACK_TYPE
Not Used
REMOTE_ADC
BATT_TEMP
<Table.5> ADC Channel Spec
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3. Circuit Description
Description
Charging Management
Temperature Sensing
REMOTE Control Detect
Battery Sensing - Now No Use
LGE Internal Use Only