topic Re: Question, i.MX28 24MHz crystal in i.MX Processors

Question, i.MX28 24MHz crystal

SLICE — Tue, 17 Apr 2018 10:05:14 GMT

Dear team,

My customer is using i.MX28 for their board now, and they want to change 24MHz crystal from the current one.
Could you show me whether there is a specification on i.MX28 about the period from start of oscillation to its stabilization?

Thanks,

Miyamoto

Re: Question, i.MX28 24MHz crystal

igorpadykov — Tue, 17 Apr 2018 11:15:43 GMT

Hi Miyamoto

I am afraid i.MX28 crystal start-up time specs are not available.

One can follow design check list and crystal requirements on

Hardware Design Checklist for i.MX28

In general time to crystal stabilization is defined by crystal Q factor

(typical Q value for a quartz oscillator ranges from 10**4 to 10**6),

it requires (roughly) Q number periods until crystal become stable.

Crystal oscillator - Wikipedia

Best regards
igor
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Re: Question, i.MX28 24MHz crystal

SLICE — Wed, 18 Apr 2018 03:31:37 GMT

Hi igorpadykov‌

Thanks for your support.

They believes that i.MX will do switching clock or releasing reset internally after stabling the oscillation.

Can I understand that users do not have to detect the stability of the oscillation externally?

Best Regards,

Miyamoto

Re: Question, i.MX28 24MHz crystal

igorpadykov — Wed, 18 Apr 2018 04:55:38 GMT

Hi Miyamoto

yes this is correct understanding.

Best regards
igor