I'm using an ADUM4160 connected to an FTDI FT245RL. When the unit is connected through a hub it works fine, and no issues. However, when connected directly to a PC, windows displays the "fails to enumerate" message.
I had PIN connected to VDD2. SPD=VDD2, SPU=VBUS.
I lifted PIN and controlled it externally. Toggling it externally when connected to a hub caused it to enumerate properly as we saw before. Toggling it when the unit is connected to a PC still gave me the "fails to enumerate" message.
How can I solve this issue?