LG C1100 Service Manual page 31

3. TECHNICAL BRIEF
VSIM
VCORE
VRTC
VMIC
VTCXO
VMEM
VEXT
3. Battery Charging Block
1. It can be used to charge Lithium Ion and/or Nickel Metal Hydride batteries.
Charger initialization, trickle charging, and Li-Ion charging control are implemented in
hardware.
2. Charging Process
- Check charger is inserted or not
- If AD6537B detects that Charger is inserted, the CC-CV charging starts.
- Exception: When battery voltage is lower than 3.2V, the precharge(low current charge
mode) starts firstly.
- And the battery voltage reach to 3.2V the CC-CV charging starts.
3. Pins used for charging
- CHG_DET: Interrupt to AD6525 when charger is plugged.
- CHG_EN: Control signal from AD6525 to charge Li+ battery
- EOC: Interrupt to AD6525 when battery is fully charged
- GATEIN: Control signal from AD6525 to charge NiMH battery. But, not used.
- MVBAT: Battery voltage divider. Divide ratio is 1:2.3 and it is sensed in AD6521
AUX_ADC
4. TA (Travel Adaptor)
- Input voltage: AC 85V ~ 260V, 50~60Hz
- Output voltage: DC 5.2V ( ±0.2 V )
- Output current: Max 850mA ( ±50mA )
5. Battery
- Li-polymer & Li-ion battery (Max 4.2V, Nom 4.0V)
- Standard battery: Capacity - 770mAh, Advanced Li-ion
Table 3-6. AD6537B LDO DESCRIPTION
Description
2.85V(is provided to SIM card)
1.8V(is provided to the AD6525 & AD6537B's digital core)
1.8V(is provided to the RTC and Backup Battery)
2.55V(is provided to the AD6525 I/O and used as microphone bias)
2.75V(is provided to VCTCXO)
2.8V(is provided to Flash)
2.8V(is provided to LCD)
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