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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 such as 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
SIM_DATA
SIM_CLK
SIM_RST
(GPIO_23)
SIM_DATA
E. Key interface
Include 5 column , 5 row and additional GPIO 35 for KEY_ROW5. The AD6527 detects whether key
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.
Table 3-6. SIM CONTRON SIGNALS DISCRIPTION
This pin receives and sends data to SIM card. This model can support
1.8volt and 3.0 volt interface SIM card.
Clock 3.25MHz frequency.
Reset SIM block
Figure 3-9. SIM Interface of AD6527
2V85_VSIM
SIM CONNECTOR
R359
20K
4
GND
5
VPP
R360
0
6
I_O
Description
2V85_VSIM
J300
1
VCC
2
RST
3
CLK
- 28 -
SIM_RST
R361
0
SIM_CLK
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