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FIBOCOM NL668-EAU-MiniPCIe-10 Hardware User Manual
Page 26 of 56
3.5.2.2 (U)SIM Card Connector Without Detection Signal
Figure 3-9 (U)SIM Interface without Card Detection Reference Design
(U)SIM card slot without card detection signal, USIM_ PRESENCE Pin remains floating.
3.5.3 (U)SIM Hot Plug
MiniPCIe supports (U)SIM card hot plug function. It determines the insertion and removal of (U)SIM card
of the slot by detecting the USIM_PERSENCE pin state to support (U)SIM card hot plug function.
The (U)SIM card hot plug function can be configured by the “AT+MSMPD” command, and the AT
commands are shown in the following table.
AT command
(U)SIM card hot plug detection
Function description
AT+MSMPD=1 Enable
Default, (U)SIM card hot plug detection is enabled
The module detects whether the (U)SIM card is
inserted through the USIM_PRESENCE pin state
AT+MSMPD=0 Close
(U)SIM card hot plug detection function is disabled
The module reads the (U)SIM card when the
device starts up, and does not detect the
USIM_PRESENCE state
Table 3-10 (U)SIM Card Hot Plug Function
After enabling the hot plug detection function of the (U)SIM card, when USIM_PRESENCE is in high level,
the module will detect the (U)SIM card insertion and then execute the initialization program of (U)SIM
card. After reading the (U)SIM card information, the module will register on the network. When the
USIM_PRESENCE is in low level, the module detects that (U)SIM card is removed, then it will not read
the (U)SIM card.
