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Using VBUS is not a must

Question asked by ofri.igal on Sep 3, 2013
I saw an old post that people said VBUS is a must, well, it is not

From the datasheet 30.5 -
"The VBUS pin can be freed by disabling the VBUS sensing option. This is done by setting the
NOVBUSSENS bit in the OTG_FS_GCCFG register. In this case the VBUS is considered
internally to be always at VBUS valid level (5 V)."

It applies to HS as well (different register though)

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