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KX-TG2257BXS
17 CIRCUIT OPERATION (Handset)
17.1. Construction
The circuit mainly consists of DSP and RF unit as shown in the block diagram.
17.1.1. DSP:IC201
Function
• • Battery Low, Power down detect circuit
• • Ringer Generation
• • Interface circuit
RF unit, speaker, mic, LED, Key scan, LCD, Headset
17.1.2. RF unit
Mainly voice signal is modulated to RF, or it goes the other way.
17.1.3. EEPROM: IC202
All setting data is stored.
ex: ID code, user setting (Flash Time, Tone/Pulse)
17.2. Power Supply Circuit
Voltage is supplied separately to each block.
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