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Original question:

AM62A3: USB OTG without PD Controller

AM62A3: Full compliant USB OTG

Jaap Overtoom
Prodigy 30 points
Part Number: AM62A3

Tool/software:

In the AM62Ax Sitara Processors Technical Reference Manual (Rev. B) it says that USB OTG is not supported.

But then the TRM also shows how to connect a USB micro-AB connector as a USB OTG port.

In AM625 / AM623 / AM625SIP / AM620-Q1 / AM62A7 / AM62A3-Q1 / AM62P / AM62P-Q1 Schematic Design Checklist (Rev. E)  it says that the USBn_ID pin can be connected to a GPIO pin., but it still says "Full compliant USB On-The-Go (OTG) feature is not supported."

 

The documentation seems to contradict it self?

Can I implement a USB OTG port with a USB micro-AB connector or not? 

What are the implications of a non "Full Compliant" USB OTG?

  • +1
    TI__Guru**** 167931 points

    Hi Jaap,

    Sorry for the confusion. The USB Specifications is not very intuitive.

    The "Full Compliant" USB OTG means the USB OTG Specifications, It includes the USB role switching protocols without detaching/attaching, such as HNP, SRP, etc. These are not supported on AM62Ax devices.

    However, what the TRM shows with the USB micro-AB connector is to support USB dual-role mode, which means the USB controller can work in either host or device mode based on the USB ID pin status from the micro-AB connector.

  • 0 in reply to Bin Liu
    Prodigy 30 points

    Thansk for the clarification. Much appreciated.