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i.MX8X power-up/down sequence guidelines

Question asked by Kazuma Sasaki on May 28, 2019
Latest reply on May 28, 2019 by Yuri Muhin

Power-up/down sequence guidelines described in datasheet.

Please let me confirm three points here.

From latest datasheet. (IMX8DXAEC Rev. 1, 5/2019)

Q1. Regarding power-up sequence. datasheet defined "a stable voltage operating within the operating range".

It means that we only care timing which over the minimum defined operating range. Is it right? I draw a timing chart based on my understanding as below. is it okay?

 

Q2. Regarding power-down sequence. datasheet mentioned "Supply group 0 must be turned off last, after all other supplies".

What timing the group 0 is allow to turn off? I draw a timing chart based on my understanding as below. Is it okay?

if my understanding wrong, please elaborate more detail about turn off timing.

 

Q3. Regarding power-up sequence. datasheet mentioned group 0 must be powered first but, other groups are allowable to power simultaneously group 0. I draw a timing chart based on my understanding as below. Is it okay?

 

Best Regards,

Kazuma Sasaki.

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