i find the spec. about UBS1_DP/USB1_DM need add an external series resistor of 33r.
however,the application about USB1,ex. MCB4300-board,there is no resister added.
So ,the resister is Necessary?
Hi,
Yes, it is necessary for USB1. Please check the OM13088: LPCXpresso4367 Development board as example.
http://www.nxp.com/downloads/en/schematics/LPCX43xx_18xx_V3_Schematic_Rev-B.pdf
Have a great day,
Soledad
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