Read Panasonic KX-TGF310RUM / KX-TGF320RUM / KX-TGF320UCM / KX-TGFA30RUM Service Manual online
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KX-TGF310RUM/KX-TGF320RUM/KX-TGF320UCM/KX-TGFA30RUM
4.8.
Circuit Operation (Handset)
4.8.1.
Outline
Handset consists of the following ICs as shown in Block Diagram (Handset) (P.16).
• DECT BBIC (Base Band IC): IC1
- All data signals (forming/analyzing ACK or CMD signal)
- All interfaces (ex: Key, Detector Circuit, Charge, EEPROM, LCD)
- All interfaces (ex: Key, Detector Circuit, Charge, EEPROM, LCD)
• EEPROM: IC3
- Setting data is stored. (e.g. ID, user setting)
4.8.2.
Power Supply Circuit/Reset Circuit
Circuit Operation:
When powering on the Handset, the voltage is as follows;
BATTERY(2.2 V ~ 2.6 V: BATT+)
BATTERY(2.2 V ~ 2.6 V: BATT+)
F1 BBC1 (IC1) 10 pin
The Reset signal generates IC1 (54 pin) and 1.8 V.
Start monitor
(IC1 57pin)
VDDC (1.2 V)
VBAT
Reset (RSTN)
(IC1_54 pin)
(IC1_54 pin)
BBIC chip initialize
(CKM/STM)
GND
BATTERY
2CELL
2CELL
BBIC
3.0V
3.0V
DOUBLER OUT (Charge Pump)
For all peripherals
For all peripherals
3.0V
3.0V
EEPROM
LCD BACKLIT LED
GND
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
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