LG B2100, Service Manual

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Service Manual /
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3. TECHNICAL BRIEF
D. SIM interface
The AD6527 provides SIM Interface Module. The AD6527 checks status periodically during established call
mode whether SIM card is inserted or not, but it doesn't check during deep Sleep mode. In order to
communicate with SIM card, 3 signals SIM-DATA, SIM-CLK, SIM-RST(GPIO-23) are required. The
descriptions about the signals are given by bellow Table 3-6 in detail.
E. Key interface
Include 5 column , 5 row and additional GPIO 35 for KEY-ROW5. The AD6527 detects whether
key is pressed or not by using interrupt method.
F. AD6537B Interrupt
AD6537B provides an active-high interrupt output signal. Interrupt signals are generated by the
Auxiliary ADC, audio, and charger modules.
Table 3-6. SIM CONTRON SIGNALS DISCRIPTION
Figure 3-9. SIM Interface of AD6527
Signals Description
SIM-DATA
This pin receives and sends data to SIM card. This model can support
1.8volt and 3.0 volt interface SIM card.
SIM-CLK Clock 3.25MHz frequency.
SIM-RST
Reset SIM block
(GPIO-23)
SIM CONNECTOR
C321
NA
1000p
C323
CLK
3
GND1
4
7
GND2
GND3
8 9
GND4
GND5
10
6
IO
2
RST
VCC
1
VPP
5
J300
C322
220n
R339
20K
C324
NA
2V85_VSIM
R346
0
R347 0
2V85_VSIM
SIM_DATA
SIM_RST
SIM_CLK