ARM Technical Support Knowledge Articles

USB LED OR USBCV TEST FAILS

Applies to: MCB2140 Evaluation Board

Answer


Information in this article applies to:


QUESTION

On the MCB2140 board the USB examples run fine, but the USB LED does not work and the examples do not pass the USBCV tests.

What could be wrong?

ANSWER

On some MCB2140 boards produced in November 2005, the resistor values R39 and R38 were reversed. Make sure that the value of R39 is 10K and R38 is 100K as stated in the MCB2140 schematics.

Make sure that you are using the current versions of the USB example projects available under:

MORE INFORMATION

Article last edited on: 2006-09-11 15:53:30

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