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FM350-GL Hardware Guide Page 37 of 67
Figure 3-16 Reference circuit for N.C. SIM card slot
The principles of the N.C.SIM card slot are described as follows:
When the SIM card is detached, it connects the short circuit between CD and SW pins, and drives
the SIM_DETECT pin low.
When the SIM card is inserted, it connects an open circuit between CD and SW pins, and drives the
SIM_DETECT pin high.
3.5.2.2 N.O. SIM Card Slot
The reference circuit design for N.O. (Normally Open) SIM card slot is shown in Figure 3-17:
Figure 3-17 Reference circuit for N.O. SIM card slot
The principles of the N.O.SIM card slot are described as follows:
When the SIM card is detached, it connects an open circuit between CD and SW pins, and drives
the SIM_DETECT pin low.
When the SIM card is inserted, it connects the short circuit between CD and SW pins, and drives the
SIM_DETECT pin high.
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