topic Re: USB Low-Speed Mode in LPC11U14 in LPCXpresso IDE

USB Low-Speed Mode in LPC11U14

lpcware — Thu, 16 Jun 2016 01:18:43 GMT

Content originally posted in LPCWare by thangle0110 on Thu Nov 21 18:12:56 MST 2013
Hi all,
I want to know exactly that does the LPC11U14 support for low-speed mode?
Now, I have moved the 1.5K pullup from usb_d+ to usb_d-. When i connect it to the host, the host receive the low-speed usb, but it doesn't run correctly.(often suppended).

There're some information that, the LPC11U14 does not support for low-speed mode(full-speed only). But as i've seen in manual that it can work in low-speed.
So, anyone can give the correct information?
Thanks all.

Re: USB Low-Speed Mode in LPC11U14

lpcware — Thu, 16 Jun 2016 01:18:43 GMT

Content originally posted in LPCWare by phucvo on Thu Nov 21 19:52:44 MST 2013
I have same problem.
And i wonder that does the LPC11u14 support for USB 1.1.
Does anyone have ideal ?
Thanks all.

Re: USB Low-Speed Mode in LPC11U14

lpcware — Thu, 16 Jun 2016 01:18:44 GMT

Content originally posted in LPCWare by Tsuneo on Sat Nov 23 07:25:40 MST 2013

Quote:
But as i've seen in manual that it can work in low-speed

The user manual clearly describes that LPC11Uxx is just for full-speed.

Chapter 11: LPC11Uxx USB2.0 device controller
11.3 Features
- USB2.0 full-speed device controller

As the host detects bus speed just with the side (D+ or D-) of pull-up, it could report low-speed when an external D- pull-up would be applied. But without device hardware capability, the device should not work in low-speed.

Tsuneo