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FIBOCOM L610-LA Series Hardware Guide
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Figure 3-9 SIM Card Slot Diagram SIM016-8P-220P
Figure 3-10 Reference Design of L610 USIM/SIM Interface with Detection Signal
Principles of SIM card slot with detection signal are as follows:
When SIM is inserted, USIM_PRESENCE pin is high level;
When SIM is not inserted, USIM_PRESENCE pin is low level.