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3. TECHNICAL BRIEF
LGE Internal Use Only
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
D. SIM interface
The AD6721 provides SIM Interface Module. The AD6721 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 3-4
in detail.
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 3.4.D SIM CONTROL SIGNALS DESCRIPTION
Figure 3.4.D2 SIM Interface of AD6721
[Rev.C] Remove N.A. resistor (R246)
SIM CONNECTOR
2V85_VSIM
0
R249
C224
1000p
2V85_VSIM
15K
R243
NA
C223
C222
NA
C221
220n
J200
1
C1
2
C2
C3
3
4
C5
C6
5
C7
6
GND1
7
8
GND2
GND3
9
10
GND4
SIM_RST
SIM_CLK
SIM_DATA
Содержание KP210
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