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The circuit mainly consists of DSP and RF unit as shown in the block diagram.
18.1.1. DSP:IC201
Function
- Battery Low, Power down detect circuit
- Ringer Generation
- Interface circuit
RF unit, speaker, mic, LED, Key scan, LCD, Headset
18.1.2. RF unit
Mainly voice signal is modulated to RF, or it goes the other way.
18.1.3. EEPROM: IC202
All setting data is stored.
ex: ID code, user setting (Flash Time, Tone/Pulse)
18.2. Power Supply Circuit
Voltage is supplied separately to each block.
18.3. Reset Circuit
Function:
This circuit is used to initialize the microcomputer when it incorporates a Battery.
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