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20
KX-TG234SK/KX-TGA470B
4.7.
Circuit Operation (Handset)
4.7.1.
Outline
Handset consists of the following ICs as shown in
Block Diagram (Handset)
(P.18).
• DECT BBIC (
B
ase
B
and IC): IC1
- All data signals (forming/analyzing ACK or CMD signal)
- All interfaces (ex: Key, Detector Circuit, Charge, EEPROM, LCD)
• EEPROM: IC3
- Setting data is stored. (e.g. ID, user setting)
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
→
BBC1 (IC1) 10 pin
The Reset signal generates IC1 (54 pin) and 1.8 V.
Startmonitor
(IC1 57pin)
VDDC (1.2 V)
VBAT
Reset (RSTN)
(IC1_54 pin)
BBIC chip initialize
(CKM/STM)
GND
BATTERY
2CELL
BBIC
3.0V
3.0V
DOUBLER OUT (Charge Pump)
For all peripherals
3.0V
3.0V
EEPROM
GND
LCD BACKLIT LED
4.0V
GND
BELL, KEY LED
3.0V
4.0 output
External Charge Pump
Circuit or IC
4.0V
VBAT
VBAT
VDDC (1.2V)
3.0V
3.0V
LCD
Содержание KX-TG234SK
Страница 49: ...49 KX TG234SK KX TGA470B Attach the LCD and fix by hook A two points A...
Страница 66: ...66 KX TG234SK KX TGA470B Memo...
Страница 71: ...71 KX TG234SK KX TGA470B Memo...
Страница 74: ...74 KX TG234SK KX TGA470B 14 5 Schematic Diagram Handset_LED LED KX TGA470 SCHEMATIC DIAGRAM Handset_LED...
Страница 76: ...76 KX TG234SK KX TGA470B Memo...
Страница 80: ...80 KX TG234SK KX TGA470B Memo...
Страница 88: ...88 KX TG234SK KX TGA470B 16 4 Accessories A1 A2 A3 A4 A5...