16 crystal capacitors tolerance

RE: 16 crystal capacitors tolerance

run_ar — Mon, 14 Dec 2015 09:54:45 GMT

I think you need to follow the advice you are given in the other tread.

RE: 16 crystal capacitors tolerance

Daniel — Thu, 10 Dec 2015 16:20:34 GMT

I'm sorry for my ausence. Not problem to upload the documents. But, they are already in the forum in this other post. Do you think it's necessary to register a new case? Just tell me, if you think it will help, I will do it without hesitation. Again, thank you for your help.

RE: 16 crystal capacitors tolerance

run_ar — Tue, 08 Dec 2015 13:43:58 GMT

Can you please upload your layout and schematics to mypage so we can take a look at it. Remember to reference this case. Thanks.

RE: 16 crystal capacitors tolerance

Daniel — Tue, 08 Dec 2015 13:22:33 GMT

Yes, I have checked. Thank you anyway for the idea!

RE: 16 crystal capacitors tolerance

run_ar — Tue, 08 Dec 2015 09:05:53 GMT

Have you checked with nRF master control panel for android? just in case your advertisement is filtered by nRF beacon?

RE: 16 crystal capacitors tolerance

Daniel — Sat, 28 Nov 2015 07:54:59 GMT

Well I have been working. I changed the crystal for another one, and changed the capacitors to 18pF (anyway 5%, I can't find 2% here). Now the crystal works. Great. Anyway I'm not caching any BLE with the nRF Beacon app for Android. Now I thing that may be a problem with the Balun and the antenna. I had handsoldered the balun, so I'm not sure that it's in the right position. I had tried a couple of times to move it up or down. It's a nightmare. I might have know to avoid the Balun, but now it's late. Any tips to check the Balun's contacts?

RE: 16 crystal capacitors tolerance

run_ar — Fri, 27 Nov 2015 16:40:18 GMT

If the crystal isn't working it is probably operating outside of spec or struggling to start at all. If you are using the softdevice it could be that the start up time is to long: For correct operation of the SoftDevice, it is a requirement that the 16 MHz crystal oscillator (16 MHz XOSC) startup time is less than 1.5 ms.

RE: 16 crystal capacitors tolerance

Daniel — Thu, 26 Nov 2015 11:28:36 GMT

Yes. That was also what I thought. But right now the crystal is not working. I have to check with a oscillograph. Had anyone ever tried the 16Mhz crystal with 2% tolerance capacitors?

RE: 16 crystal capacitors tolerance

run_ar — Wed, 25 Nov 2015 08:18:34 GMT

I would guess this will work, however I have to recommend using the recommended tolerance of 2%.