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Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
3. TECHNICAL BRIEF
D. SIM interface
The AD6726 provides SIM Interface Module. The AD6726 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.
Signals
Description
SIM_DATA
SIM_CLK
Clock 3.25MHz frequency.
SIM_RST
(GPIO_23)
Reset SIM block
This pin receives and sends data to SIM card.
This model can support 3.0 volt and 1.8 volt interface SIM card.
Table 3.5.D SIM CONTROL SIGNALS DESCRIPTION
Figure 3.5.D2 SIM Interface of AD6726
SIM_CONNECTOR
2V85_VSIM
C307
DNI
15K
R303
C306
GND1
7
8
GND2
GND3
9
10
GND4
DNI
J300
1
C1
2
C2
C3
3
4
C5
C6
5
C7
6
C304
220n
2V85_VSIM
1000p
C308
SIM_RST
SIM_CLK
SIM_DATA