3. TECHNICAL BRIEF
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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
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