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3. TECHNICAL BRIEF
D. 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
LCD_DATA
LCD_CLK
SIM_RST
(GPIO_23)
E. Key interface
Include 5 column, 5 row and additional GPIO 35 for KEY_ROW5.
The AD6527 detects whetherkey is pressed or not by using interrupt method.
F. AD6537B Interrupt
AD6537B provides an active-high interrupt output signal.
Interrupt signals are generated by the Auxiliary ADC, audio, and charger modules.
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 3-6 SIM CONTRON SIGNALS DISCRIPTION
2V85_VSIM
R336
20K
R337
SIM_DATA
0
C314
NA
Figure 3-9 SIM Interface of AD6527
Description
2V85_VSIM
J300
4
1
VCC
OND1
5
2
RST
VPP
6
3
CLK
IO
10
7
OND2
OND5
9
8
OND3
OND4
C315
C316
220n
1000p
- 26 -
SIM_RST
0
R338
SIM_CLK
C317
NA
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