ZED-F9P - Integration Manual
UBX-18010802 - R01
3 EOS/ESD/
EMI precautions
Page 35 of 64
Objective Specification - Confidential
patches or external antenna connection points, then additional ESD measures as shown in
the figure below can also avoid failures in the field.
Figure 34: RF ESD precautions
3.3 EOS precautions
Electrical Overstress (EOS) usually describes situations when the maximum input power exceeds
the maximum specified ratings. EOS failure can happen if RF emitters are close to a GNSS receiver
or its antenna. EOS causes damage to the chip structures. If the RF_IN is damaged by EOS, it’s hard
to determine whether the chip structures have been damaged by ESD or EOS.
EOS protection measures as shown in the figure below are recommended for any designs combining
wireless communication transceivers (e.g. GSM, GPRS) and GNSS in the same design or in close
proximity.
Figure 35: Active antenna EOS protection
3.4 Safety precautions
The ZED-F9P must be supplied by an external limited power source in compliance with the clause
2.5 of the standard IEC 60950-1. In addition to external limited power source, only Separated or
Safety Extra-Low Voltage (SELV) circuits are to be connected to the module including interfaces
and antennas.
For more information about SELV circuits see section 2.2 in Safety standard IEC 60950-1
