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3.5.3.2. N.O. SIM Card Slot
The reference circuit design for N.O. (Normally Open) SIM card slot is shown in Figure 3-13:
The principles of the N.O.SIM card slot are described as follows:
When the SIM card is removed, CD and SW pins are open-circuited, and the
SIM_DETECT pin is at low level.
When the SIM card is inserted, CD and SW pins are short-circuited, and the
SIM_DETECT pin is at high level.
3.5.4.
USIM Hot Plug
The AIW-356 DQ-JK1 module supports the SIM card hot plug function, and determines
whether the SIM card is inserted or removed by detecting the SIM_DETECT pin state of the
SIM card slot.
The SIM card hot plug function can be configured by using AT+MSMPD command, and the
description for AT command is shown in the following table:
Figure 3-13 Reference circuit for N.O. SIM card slot
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