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USB_OTG2_VBUS connection clarification for ON board chip to chip interface

Question asked by Logesh S on Jan 31, 2018
Latest reply on Jan 31, 2018 by igorpadykov

Hi,

 

We are using MCIMX7D3EVK10SD in our design.

 

We have received our Assembled Board. In our board USB_OTG1_DP/DN is connected to Micro USB connector. USB_OTG1_VBUS pin is left floating in processor.

 

Initially, We attempted to boot our board, by connecting USB cable from Test PC to device, but the device is not detected. But later we connected VBUS of connector and USB_OTG1_VBUS and device got detected and we are able to get prompt now.

 

But, We are using USB_OTG2_ DP and USB_OTG2_DN for on board chip to chip interface between IMX7D and LTE chip. In this port USB_OTG2_VBUS is left floating and not connected to VBUS pin of LTE. (But VBUS of LTE is supplied with onboard 5V.) For communication between IMX7D and LTE,

 

1. Does USB_OTG2_VBUS need to be powered for proper communication?

2. We did not Fan out USB_OTG2_VBUS in layout (floating). Do we have any internal register option to power up the USB_OTG2_VBUS pin?

3. Do we need to connect both VBUS of LTE and USB_OTG2_VBUS of IMX7D for proper communication?

 

Earlier as per suggestion from community VBUS of LTE pin is not connected in USB_OTG2_VBUS of processor for on board chip to chip interface.

 

Kindly request you to provide the solution as soon as possible.

 

Thanks & Regards,

Logesh

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