TauLabs/TauLabs — pull request #1262 by lilvinz (2014-09-07 20:18:25+00:00)
Title: quanton: enable internal pull-up on usb vsense line

The impedance of the voltage divider is too high and could lead to
random failure of the usb connection.
In practice this has not ever been observed on any original quanton board
as of yet but enabling the internal pull up raises the line voltage by
0.2 V and thus gives a higher error margin.