nRF52840 DCDC mode DCDC switching frequency?

RE: nRF52840 DCDC mode DCDC switching frequency?

hmolesworth — Mon, 21 Dec 2020 18:18:13 GMT

Maybe try a shielded indictor if not already using one; that would radiate less.

ketiljo — Mon, 21 Dec 2020 09:12:11 GMT

Try to separate the touch input lines as much as you can from the DCDC inductors. Ground plane between the two as well.

Poki Huang — Fri, 18 Dec 2020 14:01:41 GMT

Hi Ketijo:

Seems we check the noise is radiate out to the inductive coil, not couple on board

So do you have any suggestion that can improve this radiation, like how layout can improve it? Or any else?

Thank you~~

Poki

ketiljo — Fri, 18 Dec 2020 11:57:21 GMT

The DCDC switching frequency is fixed at 8 MHz. The energy can couple to other traces if they run near the inductors.

Poki Huang — Fri, 18 Dec 2020 05:53:17 GMT

I add one question

Will this switching frequency coupling to other trace?

If yes, do you have suggestion layout that can avoid it?

Thank you~~

Poki