Ldo Block; Battery Charging Block - LG KG110 Service Manual

3. TECHNICAL BRIEF
VSIM
SIMDATAOP
E. LDO Block
There are 8 LDOs in the AD6720.
- VCORE : supplies Digital base band Processor core and AD6720 digital core
- VMEM : supplies external memory and the interface to the external memory on the digital
base band processor (1,8V or 2.8V, 150mA)
- VEXT : supplies Radio digital interface and high voltage interface (2.8V, 170mA)
- VSIM : supplies the SIM interface circuitry on the digital processor and SIM card (2.85V,
20mA)
- VRTC : supplies the Real-Time Clock module (1.8 V, 20 mA)
- VABB : supplies the analog portions of the AD6720
- VMIC : supplies the microphone interface circuitry (2.5 V, 1 mA)
- VVCXO : supplies the voltage controlled crystal oscillator ( 2.75 V, 10 mA)

3.3.3 Battery Charging Block

1. It can be used to charge Lithium Ion batteries.
Charger initialization, trickle charging, and Li-Ion charging control are implemented
in hardware.
2. Charging Process
- Check charger is inserted or not
R341
20K J300
SCK-6S-12PT-TF
5
GND
6
VPP
7
IO
Figure 3-5: SIM Interface of AD6720
VSIM
C321
(1608)
2.2u
1
VCC
2
RST
3
CLK
18
SIMRESET
SIMCLK
R345 0