![background image](http://html.mh-extra.com/html/samsung/sgh-r220/sgh-r220_service-manual_1191004026.webp)
4. Block Diagrams
4-1 Main Baseband
Block Diagrams
4-1
Batter
y
T
ype
Batter
y
V
olta
g
e
Batter
y
T
emperature
3VTX
XVCC
R
TC_3V3
Serial Data
Interface
I/O
Interface
A/D
Interface
A
GC,AFC
PLL
LO
AD
SWITCH
Char
ging
Cir
cuit
Li-Ion Batter
y
(Standar
d)
ONE C
VIBRA
T
O
R
SYSTEM CLOCK
(13MHz)
SRAM
FLASH
EEPR
OM
R
TC_CLOCK
(32.768KHz)
KEYP
AD
SIM CARD
SPEAKER
MIC
LCD
BB INTERF
A
C
E
RF INTERF
A
C
E
ALER
T_VCC
A
VCC
VCC
3VRF