LG KG245 Service Manual page 25

3. TECHNICAL BRIEF
F. 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.
Signals
SIM_DATA
SIM_CLK
SIM_RST
(GPIO_23)
SIM_DATA
This pin receives and sends data to SIM card. This model can support
1.8volt and 3.0 volt interface SIM card.
Clock 3.25MHz frequency.
Reset SIM block
Table 3-6. SIM CONTRON SIGNALS DISCRIPTION
2V85_VSIM
J301
R369
20K
4
GND
5
VPP
6
I_O
(KDS, 1.6T)
C324
NA
SIM CONNECTOR
Figure 3-8. SIM Interface of AD6527
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Description
2V85_VSIM
1
VCC
2
RST
3
CLK
SIM_RST
SIM_CLK