Sim Interface - LG KE820 Service Manual

3. TECHNICAL BRIEF
VSUPPLY
RPWRON_EN
R453
C461
100K
100p
END_KEY
Figure9 Remote power on and End-key power on circuit

3.5. SIM interface

KE820/KG99 supports 1.8V & 3V plug in SIM, SIM interface scheme is shown in (Figure 10).
SIM_IO, SIM_CLK, SIM_RST ports are used to communicate with BBP(S-Gold2) and the SIM power
supply enabled by BBP (_SIM_EN).
SIM Interface
SIM_CLK : SIM card reference clock
SIM_RST : SIM card Async /sync reset
SIM_IO : SIM card bidirectional reset
U403 R1114D281D-TR-F
R454
1 3
VDD VOUT
1K
4 2
NC GND1
6 5
CE GND2
C460
1000p
VBAT
END
2V85_SIM
S
_SIM_EN
G
D
R320
4.7K
SIM_IO
C308
27p
Figure 10 SIM CARD Interface
END_KEY
RPWRON
RPWRON
C438 R219
1000p 100K
R321
END_KEY
10K
SI1305-E3
Q301
J301
4 1
GND VCC
5 2
VPP RST
6 3
I_O CLK
C309 C310
1u 27p
- 40 -
VBAT
R215 0
U204 NLAST4599DFT2G
6 NO
COM 5
4 NC
C233
1u
KP_OUT(1)
1
2SC5585
2 Q302
3
R322
KP_IN(5)
100K
SIM_RST
SIM_CLK
PWRON