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3. TECHNICAL BRIEF
D. SIM interface
The AD6527B 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
SIM_DATA
SIM_CLK
SIM_RST
(GPIO_23)
E. Key interface
Include 5 column , 5 row. 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 SIGNALS DESCRIPTION
2V85_VSIM
R344
20K
4
5
6
SIM_DATA
Figure 3-6. SIM Interface of AD6527B
Description
2V85_VSIM
J301
1
GND
VCC
2
VPP
RST
3
I_O
CLK
- 28 -
SIM_RST
SIM_CLK
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