LG GS290 Service Manual page 36

Figure 7 Remote power on and End-key power on circuit
3.5. SIM & uSD interface
GS290 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
SIM_IO
Figure 8 SIM & Micro SD Circuit
LG Electronics
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Only for training and service purposes
SIM CONNECTOR
VSIM_2V9 VSIM_2V9
J400
R407
4
10K C5
5
C6
6
C7
10
GND4 GND1
9
C405
GND3 GND2
22p
GCA26D-6S-H18-E1500
38/136
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VSIM_2V9
1
C1
2
C2
3
C3
7
8
C401 C410 C409
0.1u 22p DNI
3. TECHNICAL BRIEF
SIM_RST
SIM_CLK
LGE Property
LGE Internal Use Only