Service Manual

- TCXO : The clock source for various blocks of the MSM3500.- 27MHz : The clock is needed for operation of u -processor that is in
MSM53000
- 32.768KHz : This clock extends the battery life by operating the during sleep mode to save the power.
MSM500 has following features:
- Low operating voltage ( 2.7 ~ 3.6V )
- Interfaces with IFT3000 and IFR3000 of RF part directly
- Includes EVRC vocoder internally and can have external vocoder optionally
- Includes internal echo cancellation
- Including internal voice operated switch
- Microprocessor of ARM7TDMI is operated as sub-system
Memory consists of 8Mbit Flash, 2Mbit SRAM and 128Kbit of EEPROM. The main programs of the data-card are stored in Flash ROM. ESN,
NAM and other parameters and data related to call processing is stored in EEPROM.
SRAM has system parameters, data buffer and the stack values of each task.