Reference design for nRF52 (smaller footprint PCB ant or chip)?

[Shay Ohayon]

I know that Nordic has published a reference antenna design with the nRF52DK. However, I would like to develop a much smaller module with minimal antenna PCB trace or antenna chip. Does someone have a reference design for that to save up the work of trying to match components? Ideally, something like this (MDBT42: raytaccorp.blogspot.tw/.../mdbt42-module-nordic-nrf52832-solution.html)

[bjorn-spockeli]

Hi Shay,

My suggestion would be to base your design on the nRF52 Solar Powered Sensor Beacon, you can find the hardware files(i.e. gerbers, BOM and schematics) here.

Best regards

Bjørn

[Shay Ohayon]

Thanks Bjorn. Just what I was searching for!

[bjorn-spockeli]

Happy to help :)

[Shay Ohayon]

Bjorn, can you explain or comment on why P0.26 and P0/27 are connected via 10k resistors to P0.08? What is the purpose of that? Is this suppose to be some sort of pull up/down for the SDA/SCL?