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Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
3. BB Circuit Technical brief
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2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
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3.5 SIM Interface
KM555 supports 1.8V & 2.9V plug in SIM. SIM_IO, SIM_CLK, SIM_RST ports are
used to communicate with S-Gold3H-LC 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
[Figure 3.5-1] SIM Circuit
GCA26C-6S-H15-E1500
J1
8
7
6
3
5
2
4
1
VCC
GND
RST
VPP
CLK
I_O
GND1
GND2
2V9_SIM
4.7K
R20
2V9_SIM
22p
C24
22p
C23
100n
C1
DNI
C8
SIM_RST
SIM_CLK
SIM_IO
SIM SOCKET