Name: Fibocom L850-GL Series
Brand: Fibocom
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FIBOCOM L850-GL Series Hardware Guide Page 38 of 59

3.5.2 USIM Interface Circuit

3.5.2.1 N.C. SIM Card Slot

The reference circuit design for N.C. (Normally Closed) SIM card slot is shown in Figure 3-18:

Figure 3-18 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 3-19:

Figure 3-19 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.

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Fibocom L850-GL Series Specifications

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