u-blox NORA-W2 Series, Hardware Integration Manual

Page: 25 / 61

NORA-W2 series - Hardware integration manual
UBX-22005177 - R01 Design-in Page 25 of 61
C1 – Public
3.7 Design-in checklists
3.7.1 Schematic checklist
 All module pins have been properly numbered and designated in the schematic (including thermal
pins).
 Power supply design complies with the specification.
 The power sequence has been properly implemented.
 Adequate bypassing has been included in front of each power pin.
 Each signal group is consistent with its own power rail supply or proper signal translation has been
provided.
 Configuration pins are properly set at bootstrap.

SDIO bus includes series resistors and pull-ups, if needed.
 Unused pins are properly terminated.

A pi-filter is provided in front of each antenna for final matching.
 Additional RF co-location filters have been considered in the design.
3.7.2 Layout checklist
 PCB stack-up and controlled impedance traces follow the recommendations given by the PCB
manufacturer.
 All pins are properly connected, and the footprint follows u-blox pin design recommendations.
 Proper clearance has been provided between the RF and digital sections of the design.
 Proper isolation has been provided between antennas (RF co-location, diversity, or multi-antenna
design).
 Bypass capacitors have been placed close to the module.

Low impedance power path has been provided to the module.
 Controlled impedance traces have been properly implemented in the layout (both RF and digital)
and the recommendations provided by the PCB manufacturer have been followed.
 50
Ω
RF traces and connectors follow the rules described in Antenna interfaces .
 Antenna design has been reviewed by the antenna manufacturer.
 Proper grounding has been provided to the module for the low impedance return path and heat
sink.
 All traces and planes are routed inside the area defined by the main ground plane.
 u-blox has reviewed and approved the PCB 3 .
3
This is applicable only for end-products based on u-blox reference designs.