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FIBOCOM MC610 Series Hardware Guide
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The principle of SIM card slot with detection signal is described as follows:
When SIM card is inserted, USIM_PRESENCE is high level.
When SIM card is pulled out, USIM_PRESENCE is low level.
3.5.2.2 SIM Card Slot Without Detection Signal
Figure 3-13 Reference design diagram for MC610 series USIM/SIM interfaces without detection signal
SIM_IO does not require a pull-up resistor.
SIM card slot without detection signal, module USIM_ PRESENCE pins are subject to 10 kV
grounding in series.
3.5.3 USIM Design Requirements
The circuit design of SIM card needs to comply with EMC standards and ESD requirements, and needs to
improve the electromagnetic susceptibility to ensure that the SIM card can work stably. The following
points should be strictly observed in the design:
l
The layout of SIM card slot should be close to the module as far as possible, and away from RF
antenna, DCDC power supply, clock signal line and other strong interference sources;
l
The SIM card slot with metal shielding shell is used to improve the electromagnetic susceptibility;
Note:
