EVA-M8E - Hardware Integration Manual
UBX-15028542 - R05
Contents
Page 22 of 44
Production Information
2.12
C93-M8E Application Board- Evaluating EVA-M8E Module
Based on the EVA-M8E module, the C93-M8E application board enables immediate evaluation of u-
blox’s Untethered Dead Reckoning technology in most vehicle applications. The C93-M8E includes
antenna, RTC and peripheral components required to complete an end-product design in a small case,
ready for mounting in a vehicle application. The C93 offers UART (3 V logic-level) and USB interfaces
and may be powered via USB. The C93 may be installed in any stable position within the vehicle with
adequate GNSS signal levels and needs no configuration.
☞
PCB schematic, layout and BOM available upon request.
2.13
EOS/ESD/EMI precautions
When integrating GNSS receivers into wireless systems, careful consideration must be given to
electromagnetic and voltage susceptibility issues. Wireless systems include components which can
produce Electrostatic Discharge (ESD), Electrical Overstress (EOS) and Electro-Magnetic
Interference (EMI). CMOS devices are more sensitive to such influences because their failure
mechanism is defined by the applied voltage, whereas bipolar semiconductors are more susceptible
to thermal overstress. The following design guidelines are provided to help in designing robust yet
cost effective solutions.
⚠
To avoid overstress damage during production or in the field it is essential to observe strict
EOS/ESD/EMI handling and protection measures.
⚠
To prevent overstress damage at the RF_IN of your receiver, never exceed the maximum input
power as specified in the EVA-M8E Data Sheet [1].
2.13.1
Electrostatic Discharge (ESD)
Electrostatic discharge (ESD) is the sudden and momentary electric current that flows
between two objects at different electrical potentials caused by direct contact or
induced by an electrostatic field. The term is usually used in the electronics and other
industries to describe momentary unwanted currents that may cause damage to
electronic equipment.
2.13.2
ESD protection measures
⚠
GNSS receivers are sensitive to Electrostatic Discharge (ESD). Special precautions are required
when handling.
Most defects caused by ESD can be prevented by following strict ESD protection rules for production
and handling. When implementing passive antenna patches or external antenna connection points,
then additional ESD measures as shown in Figure 6 can also avoid failures in the field.
Passive antennas
Active Antennas
A
B
LNA with appropriate ESD rating
RF ESD protection diode
Figure 6: ESD Precautions
