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3. TECHNICAL BRIEF
D. SIM interface
The AD6724 provides SIM Interface Module. The AD6724 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 3-5 in detail.
LGE Internal Use Only
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Signals
Description
SIM_DATA
This pin receives and sends data to SIM card.
This model can support 3.0 volt and 1.8 volt interface SIM card.
SIM_CLK
Clock 3.25MHz frequency.
SIM_RST
Reset SIM block
(GPIO_23)
Table 3.5.D SIM CONTROL SIGNALS DESCRIPTION
Figure 3.5.D2 SIM Interface of AD6724
NA
R332
2V85_VSIM
C325
1000p
2V85_VSIM
C324
220n
C7
7
GND1
GND2
8
9
GND3
GND4
10
J300
C1
1
C2
2
3
C3
C5
4
5
C6
6
2V85_VSIM
R331
4.7K
SIM_DATA
SIM_CLK
nSIM_RST