[Urgent]Pin usage of USB_OTG serial downloader

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[Urgent]Pin usage of USB_OTG serial downloader

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ko-hey
Senior Contributor II

Hi all

My customer is building a custom board with i.MX6UL and they have to fix their schematic by this week.

They plan to use USB_OTG only for serial download.

But there are no detail description in chapter "8.9 Serial Downloader" of RM.

So let me confirm which pins need for USB_OTG serial download.

There are following pins for USB_OTG1.

Which pins do user need only for USB_OTG1 serial download ?

①USB_OTG1_DN          T15

②USB_OTG1_DP          U15

③USB_OTG1_VBUS     T12

④USB_OTG1_CHD_B   U16

⑤USB_OTG1_ID            B3,H17,K13

⑥USB_OTG1_OC          C1,C16,L15

⑦USB_OTG1_PWR       C2,C17,M16

According to the reference schematics (SPF-28617_C1.pdf and SPF-28616_C.pdf), it seems that USB_OTG serial download needs only following pins.

Is it correct ?

①USB_OTG1_DN     T15

②USB_OTG1_DP     U15

③USB_OTG1_VBUS   T12

If my understanding is correct, what is your recommended connection for unsued pins ?

If my understanding is wrong, which pad do you recommed to use for USB_OTG1_ID, USB_OTG1_OC and USB_OTG1_PWR ?

Ko-hey

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igorpadykov
NXP TechSupport
NXP TechSupport

Hi Ko-hey

you are right, only these pins are needed

USB_OTG1_DN,

USB_OTG1_DP   

USB_OTG1_VBUS

other pins can be left unconnected

Best regards

igor

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igorpadykov
NXP TechSupport
NXP TechSupport

Hi Ko-hey

you are right, only these pins are needed

USB_OTG1_DN,

USB_OTG1_DP   

USB_OTG1_VBUS

other pins can be left unconnected

Best regards

igor

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

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ko-hey
Senior Contributor II

Hi Igor

Thank you for your quick reply and answer.

I'll talk with my customer and if we have some question please let me ask again.

Ko-hey

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