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USB LDO Specification

Question asked by MARK WATSON on Mar 8, 2015
Latest reply on Mar 20, 2015 by Karina Valencia Aguilar

We are seeing some intermittent failures with the USB communication between our device (MVF61NS151...) and a host PC.  I started investigating and noted that the USB Dcap voltage is about 2.7 volts.  The tower board schematic labels this as 3V3 and the VYBRIDFSERIESEC on page 30 shows it as 3p0.  What is the correct voltage for the internal regulator for USB?  My bus voltage is at least 4.9 V, so that is not the problem.  Is there a register setting to disable the internal regulator?  I have no loads on the Dcap piin, just a couple of capacitors.