NRF52832 hardware design evaluate

RE: NRF52832 hardware design evaluate

Kaja — Fri, 28 May 2021 11:32:05 GMT

No problem,

feel free to keep it open to upload updated design files, to get a second review.

Best regards,
Kaja

RE: NRF52832 hardware design evaluate

Ys Ou — Fri, 28 May 2021 05:45:44 GMT

Kaja,

very appreciate your checking and suggestion.

Let's close this ticket.

Best Regards,

RE: NRF52832 hardware design evaluate

Kaja — Fri, 28 May 2021 05:38:54 GMT

Okay,

add some more vias close to the grounding pads of components:

Also 4*4 vias in the center pad should be enough.

Best regards,
Kaja

RE: NRF52832 hardware design evaluate

Ys Ou — Fri, 28 May 2021 01:25:25 GMT

Hi Kaja,

thanks your comment, this is the picture with drill. .

RE: NRF52832 hardware design evaluate

Kaja — Thu, 27 May 2021 11:21:10 GMT

Hi,

1. The RF path should be directly copied from the reference layout, placement of components, traces.. the blue trace should be a 50 Ohm tranmssion line, a coplanar waveguide.
2. Avoid routing under the traces to the crystal, to avoid noise on the clock and radio.
3. C6 and C33 should be placed close to pin P0.25 and P0.26 as in the reference layout, to reduce the noise and work as a sufficient workaround for errata 138.
4. I can't see any drill holes in this gerber folder.. could you share a picture of the top layer with drill holes?
5. The antenna is an pcb end mounted antenna, here it's mounted as a center-edge mounted antenna.. and the antenna pad closes to the radio is placed within the ground area, blocking it in even more.. I would recommend that you talk to the antenna vendor, and see what they say about this layout, you might have to consider changing the antenna, most vendors has a selection guide, like this one.

Best regards,
Kaja

RE: NRF52832 hardware design evaluate

Ys Ou — Thu, 27 May 2021 00:38:53 GMT

Kaja,

any suggestion for the gerber files?

RE: NRF52832 hardware design evaluate

Ys Ou — Mon, 24 May 2021 01:10:37 GMT

Hello Kaja,

Thanks your suggestion, The Pi network is for the certification requirement and will be debugged via VNA . The SW3 spoil the completed PI Net , and we will move SW3 before C26. Yes, the SW3 will impact the impedance matching ,but we would like add a manual on/off on the RF signal to see the RF signal level changing when test. this is a especial design.the antenna has a 50 ohm input impedance . attached is the gerber file.

BR,

devzone.nordicsemi.com/.../1207.GerberFiles.zip

RE: NRF52832 hardware design evaluate

Kaja — Fri, 21 May 2021 11:47:49 GMT

Hi,

you need a full pi network for the antenna:

Why do you have SW3 in the RF path?

Could you upload gerber files, so that I can give you a proper review of the layout as well?

Best regards,
Kaja