Dual Sim & U-Sd Interface - LG GX500 Service Manual

3. TECHNICAL BRIEF
GX500 Operational Description
3.5 Dual SIM & u-SD Interface
3.5.1 Dual SIM Interface
GX500 supports dual SIM mode and each SIM supports 1.8V & 2.9V plug in SIM, SIM interface scheme is
shown in (Figure 8).
SIM_IO, SIM_CLK, SIM_RST ports are used to communicate with BBP(S-Gold3) and the SIM power supply
enabled by PMIC.
SIM Interface
SIM_CLK : SIM card reference clock
SIM_RST : SIM card Async /sync reset
SIM_IO : SIM card bidirectional reset
SG3_SIM1_CLK
SGR_SIM2_CLK
SG3_SIM1_RST
SGR_SIM2_RST
C105
C112
22p 22p
Figure 3-11 Dual
SIM Interface
LGE Internal Use Only
LG Electronics
DUAL SIM SOCKET
2V9_SIM
VSIM_2V9
S102
C4
RESERVED1
C11
CLK2
C3
CLK1
C10
RST2
C2
RST1
C9
VCC2
C1
VCC1
C8
RESERVED2
C110 C109
0.1u 1u
- 48 -
48/143
C12
RESERVED3
C15
I/O_2
C7
I/O_1
C14
VPP2
C6
VPP1
C13
GND2
C5
GND1
C16
RESERVED4
C111
22p
Copyright © 2010 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Revision A
SG3_SIM1_IO
SGR_SIM2_IO
C106
22p
LGE Property