Circuit Operation (Handset) - Panasonic KX-TG2853BXS Service Manual

4.4.

Circuit Operation (Handset)

4.4.1. Construction
The circuit mainly consists of DSP and RF part as shown in the block diagram.
4.4.1.1. BBIC: IC1
Function:
• Battery Low, Power down detect circuit
• Ringer Generation
• Interface circuit (RF part, Speaker, Mic, LED, Key scan, LCD)
Initial waves:
4.4.1.2. RF part
Mainly voice signal is modulated to RF, or it goes the other way.
4.4.1.3. EEPROM: IC2
ALL setting data is stored.
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KX-TG2853BXS/KX-TG2854BXS/KX-TGA280BXS