Hello
I'm working at battery powered mobile device with USB Type C & PD support. This device should act as DRP (power sink & source). While acting as a sink it should be able to sink up to 3A at 9V, and acting as source it will provide 1.5A at 5V only. So as I have a battery charger BQ25895 in my circuit yet, it would be perfect to use it's internal boost converter for OTG to step up batter voltage to 5V for providing source for VBUS. But according to datasheet OTG boost converter could be enabled only if no voltage is detected on the VBUS. It work fine for usb 2.0, but not for USB C & PD? I mean that according to PD 3.0 spec VCONN should also be supplied by Source by default, but late VCONN source could be changed. So we can get Sink, suppling VCONN (related to BQ25895, voltage is present at VBUS and converter is disabled).
As I see, It would be Ok to have device which is sourcing VCONN only when it's a power source, but does it match PD specificaion?
I have read PD specification, but still can\t get clear undestanding: If I have DRP device, when acting as Sink should it support VCONN-Swap function? Or it just may support it?