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FIBOCOM L610-LA Series Hardware Guide
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3.5.2.2 SIM Card Slot without Detection Signal
Figure 3-11 Reference Design of L610 USIM/SIM Interface without Detection Signal
Note:
SIM card slot has no detection signal, and the module USIM_ PRESENCE pin connects 10K to
ground in series. In addition, disable SIM hot plug detection function through AT command.
3.5.3 USIM Hot Plug
L610 modules support SIM hot plug function. It determines the insertion and removal of SIM on the slot by
detecting the USIM_ PRESENCE pin state of SIM card slot to support SIM hot plug function.
SIM hot plug function can be configured by “AT+MSMPD” command, and the AT commands are shown in
the following table:
AT Command SIM Hot Plug Detection
Function Description
AT+MSMPD=1 Enabled
Default value, SIM hot plug detection function is enabled.
The module detects whether the SIM is inserted through
the USIM_PRESENCE pin state
AT+MSMPD=0 Disabled
SIM hot plug detection function is disabled. The module
reads the SIM when the device starts, and does not
detect the USIM_PRESENCE state
After the SIM hot plug detection function is enabled, when USIM_PRESENCE is in high level, the module
will detect the SIM insertion and then execute the SIM initialization program. After reading the SIM
