Hello,Community
I have an issue about the voltage of USB OTG DP pin of i.MX6.
In normal case, the DP pin should have a voltage change as bellow when the kernel is starting up.
※I measured it on i.MX6DLSabreAuto and connected the OTG port to PC.
But my customer met an problem. On their board, after the D+ pin rising to 0.6V, it will not fall down
and keep on 0.6V for ever.
Could you give me some advice to analyze the reason?(I think it is something about kernel,but I have not find it)
Best Regards,
ZongbiaoLiao
Hi ZongbiaoLiao
main points for check USB_LDO (VDD_VBUS_CAP) voltage,
24MHz signal quality and possibility of ESD damage. It may be useful
to check sect.3.14 i.MX6 System Development User’s Guide (rev.1, 6/2013)
http://cache.freescale.com/files/32bit/doc/user_guide/IMX6DQ6SDLHDG.pdf
Best regards
igor
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Hi Igor
Please help me!
Thank you very much!
Hi ZongbiaoLiao
behaviour of usb signals is described in USB 2.0 specificaion
Best regards
igor
Hi Igor
Thank you for your reply!
In normal case,why does OTG D+ pin have a voltage change as above(why does it need this)?
Please explain the reason.
Best Regards,
ZongbiaoLiao