About leak voltage by USB VBUS timing in i.MX6DQ.

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About leak voltage by USB VBUS timing in i.MX6DQ.

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keitanagashima
Senior Contributor I

Dear All,

Hello.

I have a question about  leak voltage by USB VBUS timing in i.MX6DQ.

Refer to attached file.

And, please answer to me.

Best Regards,

Keita

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1 Solution
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aven_tsao
NXP Employee
NXP Employee

HI Keita:

Sorry for my mistake.

The leakage is from the the power-mux of internal USB LDO when switching the power source.

And the leakage will turns off when the either input power source is valid.

Best regards

Aven

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aven_tsao
NXP Employee
NXP Employee

Hi Keita:

Q1. What is the cause of this leak voltage at the Case.1?

Ans. The leakage is from the the power-mux of internal USB LDO when switching the power source.

And the leakage will turns off when

Q2. Is there possibility of the destruction or malfunction of SoC by the leak voltage?

Ans. The leakage is located in power mux side , it will not affect to SoC.

Is it necessary to rise USB_OTG_VBUS and USB_H1_VBUS at the same time?

No need,

In case the USB Host port is enabled, the USB_H1_VBUS should be directly connected to a 5 V supply.

pastedImage_2.png

Best regards

Aven

1,336 Views
keitanagashima
Senior Contributor I

Hi Aven,

Please answer to my additional questions.

[Q1-1]

> Q1. What is the cause of this leak voltage at the Case.1?

> Ans. The leakage is from the the power-mux of internal USB LDO when switching the power source.

> And the leakage will turns off when

Last sentence looks blank (... turns off when ~ ??).

What did you answer last?

Best Regards,

Keita

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1,336 Views
aven_tsao
NXP Employee
NXP Employee

HI Keita:

Sorry for my mistake.

The leakage is from the the power-mux of internal USB LDO when switching the power source.

And the leakage will turns off when the either input power source is valid.

Best regards

Aven

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1,336 Views
keitanagashima
Senior Contributor I

Hi Aven, Karina

Thank you for your support.

>Sorry for my mistake.

No. problem.

Thank you very much!

Best Regards,

Keita

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karina_valencia
NXP Apps Support
NXP Apps Support

AvenTsao​ please continue with the follow up.

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karina_valencia
NXP Apps Support
NXP Apps Support

AvenTsao​ do you have an update?

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karina_valencia
NXP Apps Support
NXP Apps Support

AvenTsao​ are you able to help here?

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