TUSB422: Charging Dock Design

do you need to charge B side?

Regards

brain

Hi Brian

Only USB basic power (5V/500mA) is supplied to the B side.
-> For device operation and USB communication rather than charging

charging is for A side and A and B should be able to communicate.
In addition, A is always charged, and USB communication of A must start when B is connected

sincerely

so USB communication is between A and B, not go though MCU.

B is device only or OTG as well?

Regadrs

Brian

Hi Brian

On the B side, both OTG (UFP) and PC (DFP) are connected.
So A (DRP) needs to be able to recognize which device is connected to B.

In addition, regardless of the existence of device B, the power role with device A must be maintained until device A is disconnected.
- A : Sink
-Customize Device : Source

Sincerely

so USB communication is only between A and B, right?

Regards

Brian

Hi Brian

Yes, that's right

Sincerely

ok, It seems pretty complicated, can we have a call?

Regards

Brian