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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 below Table 3-5
in detail.
Signals
SIM_DATA
SIM_CLK
SIM_RST
(GPIO_23)
SIM_DATA
E. Key interface
Include 6 columns , 6 rows and additional GPIO 35/36 for KEY_ROW5/KEY_COL5.
The AD6527B detects whether key is pressed or not by using interrupt method.
F. AD6535 interrupt
AD6535 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 3-5. SIM CONTROL SIGNAL DESCRIPTION
SIM CONNECTOR
2V85_VSIM
2V85_VSIM
J300
R337
4
GND1
VCC
20K
5
VPP
RST
6
IO
CLK
10
GND5
GND2
9
C326
GND4
GND3
NA
Figure 3-9. SIM Interface of AD6527
- 34 -
Description
2V85_VSIM
1
2
SIM_RST
3
SIM_CLK
7
8
C325
C327
C328
220n
22p
1000p
(GPIO_23)
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