RE: nRF52810 Design check

wolver087 — Fri, 10 Jul 2020 11:48:13 GMT

Thank you very much for your response! I've made the suggested changes. Also I've changed a little my schematic (removed reset circuit, added DC-DC components) Here I moved L4 and L5 to the other side of the board. Please take a short glance on my new design and say if it is acceptable.

And a quick question: will XTAL in this design affect the radio? Isn't it too close to the antenna?

RE: nRF52810 Design check

ketiljo — Fri, 10 Jul 2020 08:24:34 GMT

[quote user=""]1) Is my schematic correct?[/quote]

Yes, the schematic looks correct.

[quote user=""]2)Should I use impedance match IC (2450FM07A0029) instead of L1-C3 matching? What are the benefits of using this chip?[/quote]

Only if you need the smaller size, else two components are more flexible.

[quote user=""]3) Is my PCB design correct (see pictures below), especially RF part?[/quote]

Two things you need to fix:

1. C3 should be grounded only to the VSS_PA pin, like this:

2. Make a straight track to the antenna,.

Else it looks just fine.

[quote user=""]5) Is it ok to provide such reset circuit? Can I ommit it? If I can, are there any other options to reset the MCU?[/quote]

You can remove R5 and C15 if you like as there are on-chip reset circuitry.

[quote user=""]6) Also, will it be a better approach to turn MCU 90 degree counter-clockwise (like in picture below)? Which one is better for radio?[/quote]

Shorter track to the antenna is always better, less insertion loss.

[quote user=""]7) Can I move some parts like decouple capacitors and XTALS to the other side of the board?[/quote]

Yes, but keep the tracks short to the capacitors.

[quote user=""]8) Is it okay to use all R and C in 0402 package?[/quote]

Yes, no problem.