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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
- 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
AD6537B
CSFS
Control
CSDI
Serial
Port
CSDO
ADC
INT
Interrupt
Logic
Figure 3-18 AD6537B BATTERY CHARGING BLOCK
: AC 85V ~ 260V, 50~60Hz
Trouble
Charge
Charge
Timer
Chg.
DAC
Aux
- 35 -
VCHG
GATEDRIVE
ISENSE
VBATSENSE
VBATx
4-Terminal Battery Pack
BATTYPE
R
TRIF
REFCHG
TEMP2
R
thermistor
AGND1
3. TECHNICAL BRIEF
VCHARGER
R
GATE
R
SENSE
R
TEMP
TEMP
resistor
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