LPC546xx and crystal-less USB0 operation in device mode

giusloq — Wed, 18 May 2022 06:36:22 GMT

It seems it's possible to use USB0 full-speed peripheral in device mode with only internal oscillator (without an external crystal).

However Errata says there's a problem with clock adjustment when the device is connected to the host through multiple bus. The work-around is:

Use the FRO calibration library provided in TN00032. This library allows the application to
have a crystal-less USB device operation in full-speed mode.

I tried to search for Technical Note TN00032, but I couldn't. Where is it?

Re: LPC546xx and crystal-less USB0 operation in device mode

xiangjun_rong — Wed, 18 May 2022 08:39:38 GMT

Hi,

You can download it from the link:

https://www.nxp.com/docs/en/application-note/TN00032.zip

If you can not download it, pls update the ticket, I will attach it here.

XiangJun Rong

topic Re: LPC546xx and crystal-less USB0 operation in device mode in LPC Microcontrollers

LPC546xx and crystal-less USB0 operation in device mode

Re: LPC546xx and crystal-less USB0 operation in device mode