About capacitor value for some power supply in i.MX6

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About capacitor value for some power supply in i.MX6

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tomo
Contributor II

Hello, all.

SABRE-SD board has 22uF capacitor for VDD_HIGH_CAP, NVCC_PLL_OUT pin.

But these pin are recommended a 10uF capacitor according to Design Checklist (IMX6DQ6SDLHDG_Rev1.pdf).

And it is written in checklist that operation cannot be guaranteed, if capacitance over 10uF.

Why SABRE-SD board has 22uF, and does SABRE-SD board not occurred problem so far?

Best regards,

Tomo

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igorpadykov
NXP TechSupport
NXP TechSupport

Hi Tomo

to guarantee operation in whole temperature range

and production process variations it is necessary to

follow recommendations Design Checklist IMX6DQ6SDLHDG_Rev1.pdf.

Also SABRE-SD board design was developed before all processor

documentation was prepared.

Best regards
igor
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tomo
Contributor II

My customer pointed out to me that 24 MHz crystal has stop once before stable oscillation.
Is this waveform good for the i.MX6?24M_XTAL.png

I changed to 22uF capacitor for NVCC_PLL_OUT pin, then 24 MHz oscillation stop phenomenon is not occured.
Could you tell me if this phenomenon is related to the value of the capacitor?

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igorpadykov
NXP TechSupport
NXP TechSupport

Hi Tomo

to guarantee operation in whole temperature range

and production process variations it is necessary to

follow recommendations Design Checklist IMX6DQ6SDLHDG_Rev1.pdf.

Also SABRE-SD board design was developed before all processor

documentation was prepared.

Best regards
igor
-----------------------------------------------------------------------------------------------------------------------
Note: If this post answers your question, please click the Correct Answer button. Thank you!
-----------------------------------------------------------------------------------------------------------------------

View solution in original post

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