Hello The following is the 42.2 electrical content of the attachment design guide:
Enumerate as a USB device when connected to a USB host, such as a Mac, and: ● Not draw more than 100 mA of current until they have been successfully enumerated. ● Request no more than 500 mA of charging current in their USB device descriptor.
It seems that this specification is for accessories with power role as sink mode.
The question is:
How to handle source mode when connecting to iPad Pro? Can it provide 5V 1.5A energy to iPad Pro and communicate through USB 2.0?
Thank you.