52832 P0.25 and P0.26 problem

RE: 52832 P0.25 and P0.26 problem

William.wei — Wed, 26 Oct 2022 09:26:22 GMT

Thank you Kaja,

understood now.

Regards,

William.

RE: 52832 P0.25 and P0.26 problem

Kaja — Tue, 25 Oct 2022 13:08:45 GMT

Hi,

there is no software option to errata 138.. so the recommendation is capacitors, or if the pin's are not in use, they can ground the pin's instead.

Best regards,
Kaja

RE: 52832 P0.25 and P0.26 problem

William.wei — Tue, 25 Oct 2022 03:12:12 GMT

Yes Helsing,

it is related to errate 138----adding capacity to this, now adding capacity to 25 and 26 pins can solve this problem. i have confirmed with customer.

so according to you ---"There is no software fix for Item 138." Just want to confirm this from you.

and bluetooth hardware design should not much change according to our reference, except 0.25 and 0.26---customer told me about this .

and testing is about "secondary harmonic" item, not details because we solved this issue quickly

Regards,

William.

RE: 52832 P0.25 and P0.26 problem

helsing — Mon, 24 Oct 2022 13:41:55 GMT

It would be key to know more about how the customer's device is failing FCC. Errata Item 138 is related to ETSI requirements so this could be something else.

The fix with the capacitors only helps for RX mode.

RE: 52832 P0.25 and P0.26 problem

helsing — Mon, 24 Oct 2022 12:34:01 GMT

[quote user=""]also we had errata to clarify about this.[/quote]

Is this the nRF52832 Revision 3 Errata Item 138?

Another case mentions that grounding the pins would help. Edit: I suppose one could ground them internally. Grounding will have to be done externally. There is no software fix for Item 138.

[quote user=""]they can't pass fcc test,the reason for this is they forgot to add capacity to those pins.[/quote]

Do you have any more information regarding how the device fails?

Would it be possible to see more of the schematics? We could make the case private if necessary. It would be interesting to see what else is connected to these two pins when considering an alternative solution.

Regarding a future hardware fix or patch: 12pF capacitors are recommended. However, the value of the missing capacitors is less important critical than and the same value as the crystal loads can be used. The important thing is that they are placed very close to the pins and that capacitors have high quality grounding.

RE: 52832 P0.25 and P0.26 problem

helsing — Mon, 24 Oct 2022 11:46:24 GMT

Hi William,

I am looking into this. It might be possible to configure the IOs in a way that is more favorable for the radio. I will get back to you when I have more information.

Regards,

Håkon