Pantech G310 Service Manual

Pantech G310 Service Manual Manual pdf 9 page image

G310 Service ManualPANTECH R&D CONFIDENTIAL8Section 4. Theory of Operation4.1 Logic Section4.1.1 DC Distribution and Regulation PartApplying battery voltage and pressing “END” key on the key pad short-circuits “Ground” and “_PowerON”. ADP3522(U103) control that power manage regarding power on/off in handsetPressing POWERKEY on the key pad is active on the handset.This will turn on all the LDOs, when POWERKEY is held low. The power of RF Tx power amplifier issupplied directly by the battery.4.1.2 Logic part4.1.2.1 SummaryThe logic part consists of AD6526 ARM7 microprocessor-combined GSM-ASIC, COMBO(flashROM & SRAM), AD6521 VBC Chip. AD6526 is GSM-ASIC chipset implemented for GSM terminal’ssystem control and baseband digital signal processing.Major parts used in the logic part are as follows:1) AD6526 : U101, [ARM7 Processor Core + GSM Signal Processing] ASIC2) AD6521 : U102, Voiceband Baseband Codec3) COMBO MEMORY(Flash ROM : U104, 128Mbit Flash Memory + 32Mbit SRAM )4.1.2.2 Baseband Digital Signal ProcessingAD6526 is a GSM core device containing ARM7 CPU core. AD6526 is 160 pin LFBGA (mini-BGA)package, consisting of terminal chips. The function and characteristics of clock are as follows:1) Complete single chip GSM Processor2) Channel codec sub-system• Channel coder and decoder• Interleaver and Deinterleaver• Encryption and Decryption3) Control Processor Subsystem including• Parallel and serial Display interface• Keypad Interface• SIM Interface• Control of RADIO subsystem• Real Time Clock with Alarm