LG B2050 Service Manual - Page 36

TECHNICAL BRIEF, Battery Charging Block

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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 -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 -830mAh CSFS CSDI CSDO AD6537B Control Serial Port Charge Timer Trouble Charge Chg. DAC Aux ADC INT Interrupt Logic VCHG GATEDRIVE ISENSE VBATSENSE VBATx BATTYPE REFCHG RTRIF TEMP2 AGND1 VCHARGER RGATE RSENSE 4-Terminal Battery Pack RTEMP thermistor RTEMP resistor Figure 3-18 AD6537B BATTERY CHARGING BLOCK - 35 -

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3. TECHNICAL BRIEF
- 35 -
Figure 3-18 AD6537B BATTERY CHARGING BLOCK
AD6537B
Control
Serial
Port
CSFS
CSDI
CSDO
Charge
Timer
Trouble
Charge
Chg.
DAC
VCHG
GATEDRIVE
ISENSE
VBATSENSE
VBATx
BATTYPE
REFCHG
R
TRIF
R
SENSE
AGND1
TEMP2
VCHARGER
R
GATE
4-Terminal Battery Pack
R
TEMP
thermistor
R
TEMP
resistor
INT
Interrupt
Logic
Aux
ADC
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
-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 -830mAh