User's Manual

N
720 Hardware User Guide
Copyright © Neoway Technology Co., Ltd 23
ESD protectors, such as ESD diodes or ESD varistors (with a junction capacitance of less than
33 pF), are recommended to be added on the SIM signals, especially in automotive electronics or
other applications with badly ESD. Replace the ESD diodes with 27 pF to 33 pF capacitors
connecting to GND in common applications. The ESD diodes or small capacitors should be close
to UIM card.
N720 supports SIM card detection. UIM_DETECT is 1.8V interrupt pins. Low level means UIM
card detected while high level mean no UIM card detected.
If you apply N720 to some electric terminals, MUP-C713(H2.8) is recommended.
Figure 2-16 Encapsulation
The antenna should be installed far away from the UIM card and UIM card traces, especially to
the build-in antenna.
The UIM traces on the PCB should be as short as possible and shielded with GND copper.
The ESD protection diodes or small capacitors should be close to UIM card on the PCB.