EVA-8M and EVA-M8 series - Hardware Integration Manual
UBX-16010593 - R06
Design-in
Page 22 of 47
Early Production Information
☞
The paste mask outline needs to be considered when defining the minimal distance to the next
component.
☞
These are recommendations only and not specifications. The exact geometry, distances, stencil
thicknesses and solder paste volumes must be adapted to the specific production processes (e.g.
soldering etc.) of the customer.
2.11.3
Placement
A very important factor in achieving maximum GNSS performance is the placement of the receiver on
the PCB. The connection to the antenna must be as short as possible to avoid jamming into the very
sensitive RF section.
Make sure that RF critical circuits are clearly separated from any other digital circuits on the system
board. To achieve this, position the receiver digital part towards your digital section of the system
PCB. Care must also be exercised with placing the receiver in proximity to circuitry that can emit heat.
The RF part of the receiver is very sensitive to temperature and sudden changes can have an adverse
impact on performance.
⚠
High temperature drift and air vents can affect the GNSS performance. For best performance
avoid high temperature drift and air vents near the module.
2.12
Migration considerations
u-blox is committed to ensuring that products in the same form factor are backwards compatible over
several technology generations. Utmost care has been taken to ensure there is no negative impact on
function or performance and to make u-blox 8 / u-blox M8 modules as fully compatible as possible
with u-blox 7 versions. If using BeiDou, check the bandwidth of the external RF components and the
antenna. For power consumption information, see the
EVA-M8 Data Sheet [1] and the EVA-8M Data
Sheet [2].
The EVA-M8M and EVA-M8Q GNSS modules provide flash firmware update capabilities when
connecting an external SQI flash memory device. More information and recommendations for using
an external SQI flash see section 2.2.5. It is highly advisable that customers consider a design review
with the u-blox support team to ensure the compatibility of key functionalities.
☞
For EVA-7M design which makes use of the single crystal feature, cannot be migrated to EVA-
M8Q! Because single crystal feature is not supported on EVA-M8Q.
☞
For an overall description of the module software operation, see the
u-blox 8 / u-blox M8 Receiver
Description Including Protocol Specification [3].
☞
For migration, see the
u-blox 7 to u-blox 8 / u-blox M8 Software Migration Guide [7].
2.12.1
Hardware migration from EVA-7M to EVA-8M / EVA-M8M / EVA-M8Q
P
in
EVA-7M
EVA-8M / EVA-M8M / EVA-M8Q
Pin Name
Typical Assignment
Pin Name
Typical Assignment
Remarks for
Migration
1
RF input
Add external LNA and
SAW if no active
antenna used
RF input
Add external LNA and SAW if no active
antenna used
EVA-8M / EVA-M8M
require external LNA if
passive antenna is
used. External LNA is
recommended for
EVA-M8Q.
2
GND
Ground
GND
Ground
No difference
3
Reserved
Leave open.
Reserved
Leave open.
No difference
4
Reserved
Leave open.
Reserved
Leave open.
No difference
