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FIBOCOM FG621-LA Series Hardware Guide
Page 33 of 57
5.3.2.2 (U)SIM Card Connector without Detection Signal
When using an (U)SIM card connector without detection signal, USIM_DET pin must be left floating, and
at the same time, the hot plug function should be disabled using AT command. The reference circuit is
shown in the figure below.
Figure 5-11 (U)SIM card connector without detection signal reference circuit
5.3.3 (U)SIM Hot Plug
FG621-LA series module supports (U)SIM hot plug function, and it determines the insertion and removal
of (U)SIM card by detecting the USIM_DET pin state.
The (U)SIM hot plug function can be configured by the “AT+MSMPD” command, and the AT commands
are shown in the following table:
Table 5-7 (U)SIM hot plug function configuration
AT command
(U)SIM hot plug
detection
Function description
AT+MSMPD=1
Enabled
(U)SIM hot plug detection is enabled by default.
AT+MSMPD=0
Disabled
(U)SIM hot plug detection function is disabled. The module
reads the (U)SIM card upon power-on, and does not detect
the USIM_DET state.
After the hot plug detection function of the (U)SIM card is enabled, if USIM_DET is in high level, the
module will detect the (U)SIM card insertion and execute card initialization program. After reading the
(U)SIM card information, the module will register network. When the USIM_DET is in low level, the
module detects (U)SIM card removal, and it will not read the (U)SIM card.
Note:
