10 Replies Latest reply on Aug 27, 2012 10:04 AM by userc_40462

Crystal oscillator Startup issue

userc_40462 Aug 18, 2017 3:58 PM

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.

1. Re: Crystal oscillator Startup issue

joanne.dreitzler Aug 16, 2012 11:31 AM (in response to userc_40462)

We had the same issue. It was a power issue. How are you supplying power to the board?
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2. Re: Crystal oscillator Startup issue

userc_40462 Aug 16, 2012 1:29 PM (in response to userc_40462)

I'm using switching regulators.
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3. Re: Crystal oscillator Startup issue

userc_40462 Aug 16, 2012 1:31 PM (in response to userc_40462)

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.
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4. Re: Crystal oscillator Startup issue

userc_40462 Aug 16, 2012 3:43 PM (in response to userc_40462)

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.
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5. Re: Crystal oscillator Startup issue

joanne.dreitzler Aug 17, 2012 1:01 PM (in response to userc_40462)

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.
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6. Re: Crystal oscillator Startup issue

userc_40462 Aug 17, 2012 1:46 PM (in response to userc_40462)

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.
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7. Re: Crystal oscillator Startup issue

joanne.dreitzler Aug 17, 2012 2:25 PM (in response to userc_40462)

That crystal should work as well. I would think....
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8. Re: Crystal oscillator Startup issue

userc_40462 Aug 22, 2012 2:48 PM (in response to userc_40462)

With the correct crystal installed, the FX3 works with either USB bus power or the ac adapter.
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9. Re: Crystal oscillator Startup issue

JoMe_264151 Aug 22, 2012 3:04 PM (in response to userc_40462)

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

Bob
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10. Re: Crystal oscillator Startup issue

userc_40462 Aug 27, 2012 10:04 AM (in response to userc_40462)

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.
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