About the leak voltage on the CMD line during linux suspend state for i.MX6UL

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About the leak voltage on the CMD line during linux suspend state for i.MX6UL

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yuuki
Contributor V

Dear all,

We check the operation of Linux on i.MX6UL_EVK board.
We see the leak voltage on the CMD line of the SD card during linx suspend state.
The voltage on the CMD line remains to around 0.6V-0.7V.

CMD line voltage.png

The following command is used to enter a system into the Suspend state.
echo mem > /sys/power/state

A used SD card is a SanDisk 4GB SD card included in the EVK board.
A TDK 8GB SD card was the same result, too.

Why does such voltage remain on the CDM line?

Does this affect the system?
(May this cause some kind of problems?)

Best Regards,
Yuuki

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igorpadykov
NXP TechSupport
NXP TechSupport

Hi Yuuki

seems this is cased by leakage, as spf-28617 U707

powers NVCC_SD1 and  may be gated during suspend,

while VSD_3V3 (always on) powers SD slot P1701.

This does not affect the system,  not cause any kind of problems.

Best regards

igor

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igorpadykov
NXP TechSupport
NXP TechSupport

Hi Yuuki

seems this is cased by leakage, as spf-28617 U707

powers NVCC_SD1 and  may be gated during suspend,

while VSD_3V3 (always on) powers SD slot P1701.

This does not affect the system,  not cause any kind of problems.

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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