LG C3400 Service Manual page 32

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 AD6535 detects that Charger is inserted, the CC-CV charging starts.
- Exception : When battery voltage is lower than 3.2V, the pre-charge
(low current charge mode) starts firstly.
- And the battery voltage reach to 3.2V the CC-CV charging starts.
3. Pins used for charging
- VCHG : charger supply.
- GATEDRIVE : charge DAC output
- ISENSE : charge current sense input
- VBATSENSE : battery voltage sense input.
- BATTYPE : battery type identification input
- REFCHG : voltage reference output
4. TA (Travel Adaptor)
- Input voltage: AC 85V ~ 260V, 50~60Hz
- Output voltage: DC 5.2V ( 0.2 V )
- Output current: Max 800mA ( 50mA )
5. Battery
- Li-ion battery (Max 4.2V, Nom 3.7V)
- Standard battery: Capacity - 1000mAh
AD6535
CSFS
Control
CSDI
Serial
CSDO Port
Charge
Timer
Aux
ADC
INT Interrupt
Logic
Figure 3-18. AD6535 BATTERY CHARGING BLOCK
VCHG
Trickle
Charge
CHGOSC
Chg. GATEDRIVE
DAC
CHGDACREF
ISENSE
VBATSENSE
VBATx
BATTYPE
REFCHG
TEMP2
AGND1
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3. TECHNICAL BRIEF
R
GATE
C
CHGOSC
R
CHGDACREF
R
SENSE
4-Terminal Battery Pack
R
TREF
R R
TEMP TYPE
thermistor resistor