Panasonic KX-TG6551CAM Service Manual page 10

KX-TG6551CAM/KX-TGA650RUM/KX-TGA651RUM
4.3.3. 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:
6.5V
AC Adaptor
VBAT
VDDC (1.2 V)
Reset (RSTN)
(IC501_54 pin)
Startmonitor
(IC501 57pin)
(CKM/STM)
VBAT
IC301
3.0V
RSTN(Reset)
DC/DC
CONVERTOR
STM/CKM
IC501
VBAT
pin 10
BBIC
pin 54
pin 57
pin 9
RF Part
BBIC chip initialize
10
+3.0V
pin 15
DOUBLER OUT
For peripherals
VDDC (1.2V)
IC611
EEPROM
IC611
Receive
Amp.