Troubleshooting HFCLKSTARTED

RE: Troubleshooting HFCLKSTARTED

FormerMember — Wed, 05 Oct 2016 12:02:54 GMT

Good that you made it work!

RE: Troubleshooting HFCLKSTARTED

Adam Sillye — Wed, 05 Oct 2016 08:28:49 GMT

Hi - thanks for the comments.

When we patched the C10 properly it immediately started to work.

So, C10 in DCDC is essential for HWCLK - at least on our board.

Thank you for the help.

RE: Troubleshooting HFCLKSTARTED

FormerMember — Fri, 30 Sep 2016 06:24:18 GMT

As far as I understand, you have some custom boards where the HFCLK in most cases won't start, and some similar custom boards where the HFCLK starts without any problems? If that is the case, I would recommend you to check the soldering on the non-properly-working boards: Check that the crystal is well soldered and that it is mounted correctly (not shifted by 90 degrees for instance). In addition, you can replace the load capacitors (C1 and C2) by some new ones, just to make sure that they have the correct value.

RE: Troubleshooting HFCLKSTARTED

butch — Thu, 29 Sep 2016 20:13:26 GMT

I don't have an answer and I'm not an expert, just thoughts: whether an oscillator starts reliably depends on adhering to a recommended layout. Are the layouts the same on your two boards? Can you characterize more than one board to have this problem? I don't think the DCDC is related, but can't you patch in the capacitor on your prototype and see if it helps?