15
KX-TG7841/KX-TG7842/KX-TG7843/KX-TG7844/KX-TG7845/KX-TG365SK/KX-TG7871/KX-TG7872/KX-TG7873/KX-TG7874/KX-TG7875/KX-TG385SK/KX-TGA680
4.6.6.
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
+5.5V
+3.0V
+3.0V
+1.8V
+3.0V_CP
IC501
IC302
IC502
BBIC
AC Adaptor
3.0V
REGULATOR
QSPI FLASH
VDD3
VDD1
VDD4
+3.0V_CP2
IC601
TAM FLASH
IC611
D610
VDD5
EEPROM
LCD
RF Part
LEDs
Q301
Bluetooth
unit
+2.4V
VDD2
Q302
IC721
Q661
LCD BLT
LCD_BLT (pin59_IC501)
Startmonitor
(IC501 57pin)
VDDC (1.2 V)
VBAT
Reset (RSTN)
(IC501_77pin)
BBIC chip initialize
(CKM/STM)