Bluetooth Antenna Problem

RE: Bluetooth Antenna Problem

ketiljo — Mon, 28 Nov 2022 08:07:22 GMT

Hi Flavio

Good to hear that you made if work!

Cheers,

Ketil

RE: Bluetooth Antenna Problem

FlavioPiracicaba — Fri, 25 Nov 2022 15:04:09 GMT

Hello Ketil,

You saved my weekend.. I replaced the Crystal and now it's working.

Thanks for all.

Flavio

RE: Bluetooth Antenna Problem

ketiljo — Thu, 24 Nov 2022 13:28:13 GMT

Hi Flavio

Yes, this should be good.

Cheers,

Ketil

RE: Bluetooth Antenna Problem

FlavioPiracicaba — Thu, 24 Nov 2022 12:40:12 GMT

Hi Ketil,

I specified a crystal, not a PLL. I don't know what's happened. Now I will replace by this one:

ECS-320-8-37-CKM-TR3 (32 MHz ±10ppm Crystal 8pF 60 Ohms 4-SMD).

Do you know if it will work well?

Thanks,

Flavio.

RE: Bluetooth Antenna Problem

ketiljo — Thu, 24 Nov 2022 10:14:52 GMT

Hi Flavio

You can't use this crystal oscillator at all. The problem with this is that it has a PLL to generate the frequency. The phase noise is too large so the receiver won't work. You need to use a proper crystal.

Cheers,

Ketil

RE: Bluetooth Antenna Problem

FlavioPiracicaba — Thu, 24 Nov 2022 10:11:33 GMT

Correct, The Pin 4 of cristal is wrong connected. Must be powered.

I will try to fix it and I will reply you.

Thanks,

Flavio.

RE: Bluetooth Antenna Problem

ketiljo — Thu, 24 Nov 2022 08:25:12 GMT

I Flavio

Is this the 32 MHz oscillator you're using? https://www.digikey.no/en/products/detail/kyocera-avx/KC2016K32-0000C1GE00/5322520

If so, you need to switch to a proper crystal. This is a complete oscillator that needs to be powered separately. From the schematic, it looks like you meant to use a crystal here.

Best regards,

Ketil Aas-Johansen

RE: Bluetooth Antenna Problem

FlavioPiracicaba — Wed, 23 Nov 2022 14:31:13 GMT

Crystals:

32KHz: XL1/XL2 is 9HT11-32.768KBZC-T.

32MHz: XC1/XC2 is KC2016K32.0000C1GE00

There isn't capacitors installed on the crystals.

I done the debug, the code is running, but the Bluetooth is not broadcasting. I can't see the client as I can when I use the development kit.

Thanks,

Flavio

RE: Bluetooth Antenna Problem

Kenneth — Wed, 23 Nov 2022 11:54:46 GMT

Hello,

If you don't have access to equipment do measurements, you may consider using a pre qualified nRF5340 module in your design, this will ensure qualified design that also pass radio regulations around the world. For a list of modules:
https://www.nordicsemi.com/Nordic-Partners/3rd-party-modules

The 32kHz crystal affect timing (such as for instance sleep intervals and maintaing a connection), however in your case it seems you have a fundamental problem with getting the radio to work, in such case the problem is related to the 32MHz crystal. So I guess the question then is what 32MHz crystal you have used in your design, and if you have potentially adjusted the load caps in accordance with possible CL parameter for the 32MHz in your design. If you can provide partnumber and CL for the 32MHz crystal used I can take a look at the parameters.

Also, have you done any debugging to find if the code seem to run normally?

Best regards,
Kenneth