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LPC1788: USB D+ Line pull-down after 11us

Question asked by Paul Shaffer on Jun 19, 2019
Latest reply on Jun 19, 2019 by Sabina Bruce

I would like more information about theUSB 2.0  D-PLUS line on the NXP part number LPC1788 microcontroller. When we power up, the D+ line starts to go "tri-state", then after 11us, the D+ line is internally pull-down to ground.  Why?