JODY-W2 - System integration manual
UBX-18068879 - R14
Design-in
Page 34 of 84
C1 - Public
⚠
Special care should be taken if the
ANT0
and
ANT1
pins must be protected by choosing an ESD
absorber with adequate parasitic capacitance. For 5 GHz operation, a protection with maximum
internal capacitance of 0.1 pF is recommended.
2.10
Design checklist
Schematic checklist
JODY-W2 module pins are properly numbered and designated on the schematic (including
thermal pins).
Power supply design complies with the specification.
The power sequence is properly implemented.
Adequate bypassing is present 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.
Unused pins are properly terminated.
A pi-filter is provided in front of each antenna for final matching.
RF co-location additional filters have been considered in the design.
Layout checklist
PCB stack-up and controlled impedance
traces follow PCB manufacturer’s recommendation.
All pins are properly connected, and the package follows u-blox recommendations for pin
design.
Proper clearance has been provided between the RF and digital sections.
Proper isolation has been provided between Antennas (RF co-location, diversity, or multi-
antenna design).
Bypass capacitors are placed close to the module.
Low impedance power path has been provided to the module.
Controlled impedance traces are properly implemented on the layout (both RF and digital) and
follow PCB manufacturer recommendations.
50
Ω
RF traces and connectors follow the rules described in
Antenna design has been reviewed by the antenna manufacturer.
The module has proper grounding for low impedance return path and heat sink.
Reference plane skipping has been minimized for high frequency busses.
All traces and planes are routed inside the area defined by the main ground plane.
u-blox has reviewed and approved the PCB
11
.
11
This is applicable only for end-products based on u-blox reference designs.
