LG C3400 Service Manual page 23

3. TECHNICAL BRIEF
D. SIM interface
The AD6527B provides SIM Interface Module. The AD6527B 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.
Signals
SIM_DATA
SIM_CLK
SIM_RST(GPIO_23)
SIM_DATA
E. Key interface
Include 5 column , 5 row and additional GPIO 35 for KEY_ROW5. The AD6527B detects
whether key is pressed or not by using interrupt method.
F. AD6535 Interrupt
AD6535 provides an active-high interrupt output signal. Interrupt signals are generated by the
Auxiliary ADC, audio, and charger modules.
Description
This pin receives and sends data to SIM card. This model can
support 3.0 volt Interface SIM card Only.
Clock 3.25MHz frequency.
Reset SIM block
Table 3-6. SIM CONTRON SIGNALS DISCRIPTION
2V85_VSIM
SIM CONNECTOR
R346
20K
4
5
R348 0 6
Figure 3-9. SIM Interface of AD6527B
2V85_VSIM
1
GND VCC
2
VPP RST
3
I_O CLK
J300
- 22 -
SIM_RST
R349 0
SIM_CLK