Can you please tell me where I can find an USB dongle which follows this diagram:
I have a tablet and a BobjGear USB to RJ45 Ethernet Adapter, but the battery will discharge while using the tablet connected to the network cable.
I want something as described in the diagram where A is the tablet, B is the Ethernet Adapter and C is the regular USB charger !
Does such a thing exists ?
What will happen to the tablet when I will try to provide the input power while it's supposed to be outputting power ? Is it even possible to connect the power in parallel – as the Tablet A is supposed to power the Adapter B ( A -> B )
Connecting the charger will force the current to flow in the opposite direction ( C -> A & C -> B ) ?
Best Answer
According to the USB specification, these things should NOT exist. They are illegal (re: USB) for precisely the reasons you are struggling with it.
Electrically, we describe this condition as "contention." You are causing two power sources to fight for control of a wire. It's a bad thing... ;-)
USB On-The-Go (OTG) uses a separate pin (not shown in your diagram) to solve the contention issue.