Power Supply Circuit/Reset Circuit - Panasonic KX-TGC220AL Service Manual

KX-TGC220/KX-TGC222/KX-TGC223/KX-TGCA20
4.4.4.

Power Supply Circuit/Reset Circuit

The power supply voltage from AC adaptor is converted to VBAT (3.0V) in IC302. And +3.0V for peripherals and analog part is
insulated from VBAT by Doubler of BBIC.
Circuit Operation:
5.5V
AC Adaptor
VBAT
IC302
3.0V
REGULATOR
VBAT
VDDC (1.2 V)
Reset (RSTN)
(IC501_54 pin)
Startmonitor
(IC501 57pin)
(CKM/STM)
IC501
VBAT
pin 10
RSTN(Reset)
BBIC
pin 54
STM/CKM
pin 57
pin 9
RF Part
ANS LED
MSG LED
BBIC chip initialize
12
+3.0V
pin 15
DOUBLER OUT
For peripherals
VDDC (1.2V)
IC601
FLASH
IC611
EEPROM
Receive
Amp.