Crystal oscillator Startup issue

[Anonymous]

Has anyone had issues with the crystal oscillator not starting? I'm using a Kyocera 19.2MHz crystal, CX3225GB series with no luck.  External oscillator input works fine.

[Anonymous]

We had the same issue.  It was a power issue.  How are you supplying power to the board?

[Anonymous]

I'm using switching regulators.

[Anonymous]

I should elaborate.  External (non-USB) 5V supply driving on-board switching regulators. I checked the voltage rails and haven't seen any noise problems.

[Anonymous]

So apparently, my 19.2MHz crystal is actually an 18.432MHz crystal (thank you Digi-Key) .  I'm assuming this would prevent the oscillator from starting up.

[Anonymous]

We are bus powered.  When we plugged a 2.0 USB cable into a wall adapter, the crystal would not work.  When we plugged the same cable into a USB 2.0 port, the crystal worked fine.

   

Our power lines looked fine, too, but the crystal still didn't work.

[Anonymous]

Interesting.  I have the ability to bus power my board so I'll try this, if I ever get the right crystal from Digi-Key.

[Anonymous]

That crystal should work as well.  I would think....

[Anonymous]

With the correct crystal installed, the FX3 works with either USB bus power or the ac adapter.

[Bob_Marlowe]

Grreat! Took you exactly one week to get it to work. Who pays for the mistake?

       

Bob

[Anonymous]

Digi-Key was very happy to send me the wrong part, again.  After that I gave up and ordered a new oscillator.  Ultimately, it's always the developer that pays for these mistakes.