3. TECHNICAL BRIEF
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
18
Figure 3-5: SIM Interface of AD6720
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