Processor Expert Software中的主题 Re: lpc55xx vbus disable

lpc55xx vbus disable

_Ferrari_ — Thu, 29 Dec 2022 17:20:11 GMT

Dear all,

Is there any possibility to disable VBUS signal in the USB0 peripheral of LPC5526 processor ?

Unfortunately I have all pins busy so I'm asking if there is a possibility to disable the VBUS signal of USB0 peripheral and try to simulate USB connection in other way

thank you very much for your help amnd cooperation

best regards

Re: lpc55xx vbus disable

ZhangJennie — Fri, 30 Dec 2022 08:45:05 GMT

Hi _Ferrari_

When USB as device, USB device gets the 5V from the host via VBUS. USB device judges whether VBUS has power to determine whether USB is plugged in. So we recomend user not disable VBUS to gurantee USB working normally.

If you don't care if there is a disconnect event or not, you can set FORCE_ VBUS bit to 1. It means VBUS is always connected. They don't need to connect VBUS pin from the connector to our USB_VBUS pin physically and the voltage level of VBUS won't matter. Thus I can't gurantee USB working stable. This is not our recommended design.

Have a nice day,

Jun Zhang

Re: lpc55xx vbus disable

_Ferrari_ — Fri, 30 Dec 2022 08:38:06 GMT

Ok, I understand,

Thank you very much and happy new year!

Re: lpc55xx vbus disable

madhubanti — Thu, 10 Apr 2025 14:22:12 GMT

where to find the FORCE_ VBUS?