LG C1150 Service Manual page 37

3. TECHNICAL BRIEF
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 - 760mAh, Advanced Li-polymer
CSFS
CSDI
INT
AD6537B
Control
Serial
Port
CSDO
Charge
Timer
Aux
ADC
Interrupt
Logic
Figure 3-19. AD6537B BATTERY CHARGING BLOCK
VCHG
Trouble
Charge
GATEDRIVE
Chg.
DAC
ISENSE
VBATSENSE
VBATx
BATTYPE
R
TRIF
REFOHG
AGND1
- 38 -
VCHARGER
R
GATE
R
SENSE
3-Terminal
Battery Pack
R
TEMP
thermistor