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STM32L476 USB Termination

Question asked by riggs.rob on Apr 13, 2016
Latest reply on Sep 29, 2016 by sjoberg.christian
Hi folks,

I am a little confused about USB termination requirements on the STM32L476 part.  I read in the datasheet that termination resistors on D+/D- are not needed and that the impedance matching is done by the internal PHY (as well as pull-up).

However, I was reviewing the schematics for the STM32L4 Discovery board and it shows that termination resistors are used externally.  As I would consider this a reference design, I am a bit confused by the discrepancy.

Are the 22 Ohm termination resistors needed on D+/D- with this part or not?



PS -- This forum software is absolutely horrible.  It is impossible to tell if this question has already been asked and answered.