EVA-M8E - Hardware Integration Manual
UBX-15028542 - R05
Contents
Page 7 of 44
Production Information
2
Design-in
In order to obtain good performance with the GNSS receiver module combined with Untethered Dead
Reckoning (UDR) technology, there are a number of points that require careful attention during the
design-in. These include:
•
Power Supply: Good performance requires a clean and stable power supply.
•
Interfaces: Ensure correct wiring, rate and message setup on the module and your host system.
•
Antenna interface: For optimal performance, seek short routing, matched impedance and no
stubs.
•
External LNA: With EVA-M8E an additional external LNA is recommended if a passive antenna is
used.
2.1
Power management
2.1.1
Overview
The EVA-M8E module provides four supply pins:
VCC
,
VCC_IO
,
V_BCKP
and
VDD_USB
. They can be
supplied independently or tied together to adapt various concepts, depending on the intended
application. The different supply voltages are explained in the following subsections.
Figure 1 shows an example to supply the EVA-M8E module when not using the USB interface. In this
case, the
VDD_USB
pin is connected to ground.
Figure 1: EVA-M8E power supply example
