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D. SIM interface
The AD6720 provides SIM Interface Module. The AD6720 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
SIM_DATA
SIM_CLK
SIM_RST
(GPIO_23)
SIM_DATA
This pin receives and sends data to SIM card.
This model can support only 3.0 volt interface SIM card.
Clock 3.25MHz frequency.
Reset SIM block
Table 3-5. SIM CONTROL SIGNALS DESCRIPTION
2V85_VSIM
SIM CONNECTOR
R120
20K
4
GND1
5
VPP
R126
6
IO
10
0
GND5
9
GND4
C133
NA
Figure 3-5. SIM Interface of AD6720
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3. TECHNICAL BRIEF
Description
2V85_VSIM
J100
1
VCC
2
RST
3
CLK
7
GND2
8
GND3
C128
C134
220n
22p
SIM_RST
SIM_CLK
C135
1000p
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