for a project I'm working on I am required to have two USB connectors:
- the first is used to provide data and power to only one IC of the board
- the second is used to provide power only to everything else on the board
Since the two USB connectors could be plugged to different sources (one to a PC for data transfer, one to a USB wallwart charger), what do I do with the grounds?
Should I tie them together or keep them separate?
My guts say to do the latter (keep the "data" ground away from the "power" ground, no touchy).