EVA-M8M - Hardware Integration Manual
UBX-14006179 - R02
Early Production Information
Design-in
Page 8 of 45
2
Design-in
In order to obtain good performance with a GNSS receiver module, 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-M8M an additional external LNA is
mandatory
if a passive antenna is used
to achieve the performance values as written in the
EVA-M8M Data Sheet
2.1
Power management
2.1.1
Overview
The EVA-M8M modules provide 4 supply pins:
VCC
,
VCC_IO
,
V_BCKP
and
V_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-M8M modules when not using the USB interface. In this case, the
V_USB
pin is connected to ground.
Figure 1: EVA-M8M power supply example
