21
KX-TG4221N/KX-TG4222N/KX-TG4223N/KX-TG313SK/KX-TG4224N/KX-TG4225N/KX-TGA421N
4.7.
Circuit Operation (Handset)
4.7.1.
Outline
Handset consists of the following ICs as shown in
• DECT BBIC (
B
ase
B
and IC): IC5
- All data signals (forming/analyzing ACK or CMD signal)
- All interfaces (ex: Key, Detector Circuit, Charge, EEPROM, LCD.)
- PLL Oscillator
- Detector
- Compress/Expander
- Reception
• EEPROM: IC3
- Temporary operating parameters (for RF, etc.)
4.7.2.
Power Supply Circuit/Reset Circuit
Circuit Operation:
When power on the Handset, the voltage is as follows;
BATTERY(2.2 V ~ 2.6 V: BATT+)
F1
Q2 (1.8 V), IC5-49pin (3.0V)
The Reset signal generates IC5 (68 pin) and 1.8 V.
1.8 V
Reset
(IC1_61pin)
B
Содержание KX-TG4221N
Страница 65: ...65 KX TG4221N KX TG4222N KX TG4223N KX TG313SK KX TG4224N KX TG4225N KX TGA421N Memo ...
Страница 68: ...68 KX TG4221N KX TG4222N KX TG4223N KX TG313SK KX TG4224N KX TG4225N KX TGA421N Memo ...
Страница 72: ...72 KX TG4221N KX TG4222N KX TG4223N KX TG313SK KX TG4224N KX TG4225N KX TGA421N Memo ...