LG FM300 Service Manual page 23

3.2.5 SIM interface (sub board, U600)
Xenon[FM300] supports 1.8V & 2.9V plug in SIM, SIM interface scheme is shown in figure 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 y
SIM_IO : SIM card bidirectional reset
SIM_PWRDOWN
SIM_PWRSEL
LGE Internal Use Only
y
2V6_IO
1
STOP_
2
MOD_VCC
3
VDD
100n
C600
4
NC1
SYS_PWR
100n
C604
SIM_PWR
Figure 3.12 SIM Interface
U600
NCN4555
12
NC3
11
SIM_CLK
10
GND
9
SIM_RST
17
G_SLUG
100n
C605
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3. TECHNICAL BRIEF
3. TECHNICAL BRIEF
SIM_CLK
SIM_RST
SIM_DATA
Only for training and service purposes