Hi all
I'd like to get your thoughts on my problem.
My customer built custom boards that is over 10 with i.MX6Dual and had some issues.
The issues are as below.
These boards can boot from serial boot.
When they test a platform_SDK and DDR Stress Test, it has no error.
The concern is that the board isn't satisfied with the location of the bulk capacitor recommedation.
From the above results, I guess that it is caused by lack of meeting some recommendation.
So if they satisfy some recommendation, the issues will be disappeared.
What do you think about it ?
Please tell me your opinion.
Ko-hey
已解决! 转到解答。
Hi ko-hey
you are right, not following bulk capacitor placement recommedations
may lead to described issues.
Recommended to place the various sized CAPs, where as the larger sized bulk
CAPs are further out and the smaller high freq CAPs (0.22 uF) are closest to the
power balls as possible. To satisfy stability requirements over process and
temperature conditions one needs to follow EB814:
http://cache.freescale.com/files/32bit/doc/eng_bulletin/EB814.pdf
Best regards
igor
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Hi ko-hey
you are right, not following bulk capacitor placement recommedations
may lead to described issues.
Recommended to place the various sized CAPs, where as the larger sized bulk
CAPs are further out and the smaller high freq CAPs (0.22 uF) are closest to the
power balls as possible. To satisfy stability requirements over process and
temperature conditions one needs to follow EB814:
http://cache.freescale.com/files/32bit/doc/eng_bulletin/EB814.pdf
Best regards
igor
-----------------------------------------------------------------------------------------------------------------------
Note: If this post answers your question, please click the Correct Answer button. Thank you!
-----------------------------------------------------------------------------------------------------------------------
Hi Igor
I'm sorry in insufficient explanation.
I want to know a recommend equipment condition such as sampling freq of oscilloscope and type of probe.
What conditions do you measure the ripple on voltage rail in freescale ?
Ko-hey