18
KX-TG4771B/KX-TG4772B/KX-TG4773B/KX-TGA470B
4.7.
Circuit Operation (Portable)
4.7.1.
Outline
Portable consists of the following ICs as shown in
Block Diagram (Portable)
(P.16).
• 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 Portable, 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-TGA470B
Страница 65: ...65 KX TG4771B KX TG4772B KX TG4773B KX TGA470B Memo ...
Страница 72: ...72 KX TG4771B KX TG4772B KX TG4773B KX TGA470B 14 6 Portable LED LED KX TGA470 SCHEMATIC DIAGRAM Handset LED ...
Страница 74: ...74 KX TG4771B KX TG4772B KX TG4773B KX TGA470B Memo ...
Страница 80: ...80 KX TG4771B KX TG4772B KX TG4773B KX TGA470B Memo ...