Users Manual

LTE Standard Module Series
EC25 Hardware Design
EC25_Hardware_Design
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EC25 supports (U)SIM card hot-plug via the USIM_PRESENCE pin. The function supports low level and
high level detections. By default, it is disabled, and can be configured via AT+QSIMDET command.
Please refer to document [2] for more details about the command.
The following figure shows a reference design for (U)SIM interface with an 8-pin (U)SIM card connector.
Figure 17: Reference Circuit of (U)SIM Interface with an 8-pin (U)SIM Card Connector
If (U)SIM card detection function is not needed, please keep USIM_PRESENCE unconnected. A
reference circuit for (U)SIM interface with a 6-pin (U)SIM card connector is illustrated in the following
figure.
Figure 18: Reference Circuit of (U)SIM Interface with a 6-pin (U)SIM Card Connector