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L830-EB Hardware User Manual Page 24 of 39
The principles of the N.C. SIM card slot are described as follows:
When the SIM card is detached, it connects the short circuit between CD and SW pins, and drives the
SIM_DETECT pin low.
When the SIM card is inserted, it connects an open circuit between CD and SW pins, and drives the
SIM_DETECT pin high.
3.5.2.2 N.O. SIM Card Slot
The reference circuit design for N.O. (Normally Open) SIM card slot is shown in Figure 3-13:
Figure 3-13 Reference Circuit for N.O. SIM Card Slot
The principles of the N.O. SIM card slot are described as follows:
When the SIM card is detached, it connects an open circuit between CD and SW pins, and
drives the SIM_DETECT pin low.
When the SIM card is inserted, it connects the short circuit between CD and SW pins, and drives
the SIM_DETECT pin high.
3.5.3 USIM Hot-Plugging
The L830 module supports the SIM card hot-plugging function, which determines whether the SIM card is
inserted or detached by detecting the SIM_DETECT pin state of the SIM card slot.
The SIM card hot-plugging function can be configured by “AT+MSMPD” command, and the description for
AT command as shown in the following table:
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