Read Panasonic KX-UDT111RU (serv.man3) Service Manual online
7
KX-UDT111RU
4.2.
Circuit Operations
4.2.1.
Outline
Handset consists of the following ICs as shown in Block Diagram (Handset).
• BBIC (Base Band IC): IC100
- All data signals (forming/analyzing ACK or CMD signal)
- All interfaces (ex: Key, Detector Circuit, Charge, LCD, LED, SRAM, Flash ROM)
- All interfaces (ex: Key, Detector Circuit, Charge, LCD, LED, SRAM, Flash ROM)
• SRAM: IC101
- Application data and code are temporarily stored.
• Flash ROM (substitute EEPROM): IC102
- Adjustment data, program data and temporary user data are stored.
• RF IC: IC1
- PLL Oscillator
- Detector
- Compress/Expander
- Amplifier for reception
- Amplifier for transmission
- Detector
- Compress/Expander
- Amplifier for reception
- Amplifier for transmission
4.2.2.
Power Supply Circuit / Reset Circuit
The power supply of each IC is as follows.
The Power On Reset is designed to guarantee power-on of the system only when 1.8v and 3.0v voltages exist.
The Power On Reset is designed to guarantee power-on of the system only when 1.8v and 3.0v voltages exist.
4.2.3.
Reset Circuit
The reset signal is generated with IC1(44Pin).
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