USB Power Draw?


I looked around a few places, but couldn’t find the specs for the USB host port anywhere. What are the limits for current on that port? There are a few mentions around the site / docs that advise that one can use a USB hub to allow for multiple devices (which I’d like to do). Does the Duo have any protection from overdraw?


Hi Brian. Yes, there is a protection IC in the USB Host. About the maximum current the correct answer is, depends. The power supply is shared with CPU, Control Chain devices, etc. Anyway, you can assume the USB host can provide maximum of 800mA.