Ublox NORA-W36 Series, System Integration Manual

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NORA-W36 series - System integration manual
UBX-22021120 - R01 Design-in Page 24 of 48
C1-Public
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, like GPIO_J9 , SWITCH_1 and SWITCH_2, are properly set and can be controlled
from host or be accessed through test points to allow boot into Bootloader.
 DBG_TX should be available from host or accessed through test points to allow debug logging.
 Unused pins are properly terminated.

A pi-filter is provided in front of each antenna for final matching (NORA-W361 only)
 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 RF connector design .
 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.
 Reference plane skipping has been minimized for high frequency buses.
 All traces and planes are routed inside the area defined by the main ground plane.
 u-blox has reviewed and approved the PCB 2 .
2 Applicable only for end-products based on u-blox reference designs