i.MX Processors中的主题 Re: imx7d external clock source voltage range

imx7d external clock source voltage range

felixhsu — Wed, 10 Jan 2018 10:18:15 GMT

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.

Re: imx7d external clock source voltage range

CarlosCasillas — Wed, 10 Jan 2018 23:34:57 GMT

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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Re: imx7d external clock source voltage range

twhsueh — Thu, 11 Jan 2018 07:54:45 GMT

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,

Re: imx7d external clock source voltage range

CarlosCasillas — Fri, 12 Jan 2018 00:39:28 GMT

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