imx7d external clock source voltage range

[felixhsu]

Hi All

Could you tell me the imx7d external clock source voltage range is 1.8V or 3.3V or other voltage range?

PS: the external clock means EXT_CLK1 or EXT_CLK2 ...etc.

Thanks.

[twhsueh]

Hi Carlos,

    If "SD1_DATA1(pin D6)" is set to "CCM_EXT_CLK2" and NVCC_SD1 : 3.3V. 

    OSC clock input can not exceed 1.8V too?

   

thanks,

[CarlosCasillas]

Hi Felix,

When the pad is configured to SD card functionality, it will be tight to 3.3V rail; however, when using the pin as CCM_EXT_CLK, it will be tight to 1.8V rail.

As a final note, all of the CCM CLK pins are outputs (the N/P are differential outputs, and the other are single-ended).

Hope this will be useful for you.

Best regards!

/Carlos

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[CarlosCasillas]

Hi Felix,

You could refer to section 5.3.2 of the i.MX7D Reference Manual, where it is mentioned oscillator pads should be supplied to 1.8V, and higher voltages must not be applied:

https://www.nxp.com/docs/en/reference-manual/IMX7DRM.pdf

Hope this will be useful for you.

Best regards!

/Carlos

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