3. TECHNICAL BRIEF
- 34 -
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.
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.
Signals
Description
SIM_DATA
This pin receives and sends data to SIM card.
This model can support only 3.0 volt interface SIM card.
SIM_CLK
Clock 3.25MHz frequency.
SIM_RST
Reset SIM block
(GPIO_23)
Table 3-5. SIM CONTROL SIGNAL DESCRIPTION
Figure 3-9. SIM Interface of AD6527
SIM CONNECTOR
(GPIO_23)
22p
C327
2V85_VSIM
220n
C325
9
10
GND5
IO
6
2
RST
1
VCC
VPP
5
J300
CLK
3
4
GND1
GND2
7
8
GND3
GND4
2V85_VSIM
2V85_VSIM
C326
NA
C328
1000p
20K
R337
SIM_RST
SIM_CLK
SIM_DATA
Содержание KG920
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