USB-C Charging on the PBP?

[moonwalkers]

@moonwalkers

K, but you asserted, quite rudely, that anything over 7.5w MUST be PD.

You were totally wrong.

Instead of writing a novel you could just say "oops, sorry for being so wrong and so rude"

Bottom line:
THERE IS NO PD CHARGING ON THE PBP.

Have a nice day!

My comment about me getting annoyed wasn't directed specifically at you, it was more at the general "WTF says PD but can't charge quickly" attitude. I should've made that clear and apparently I failed to do so, for that I apologize.

And yes, I was wrong in my claim that without PD USB type C cannot deliver more than 7.5W, but I incidentally happened to be correct that just because the port cannot go above 3A@5V doesn't mean it doesn't support PD. You were correct that USB type C can deliver 3A without PD, but incorrect that inability to go beyond 3A@5V means it doesn't support PD. Hence my statement that looks like we may be both correct and incorrect at the same time.

I hope I've clarified my position and we can return to a more civilized discussion.

And to address your last comment:

THERE IS NO PD CHARGING ON THE PBP

According to the specs, it appears there are effectively three different ways to negotiate power delivery:

• standard in-band "unit load" approach, where device requests the number of said unit loads and host controls the power output - until introduction of USB type C also the only standard approach
  
• USB type C @1.5A and @3A, where upstream host provides given fixed power and the downstream device decides how much it will take
  
• USB PD, where devices initially use standard minimal unit load and then re-negotiate both voltage and current.
  

From reading those specs it is my understanding that if PBP is connected to a PD-aware charger through a PD-aware cable then the power delivery between the two devices will be negotiated using PD mechanism but still will not exceed what PBP's charge controller can take, whereas if either the cable or the charger are not PD-aware then the power delivery will happen using either USB type C @1.5A/@3A or the pre-type-C "unit load" approach.

While we now know that PBP does indeed support USB PD (since that is a prerequisite for supporting DisplayPort alternate mode), we can verify your claim of PBP not supporting PD charging using the experiment I proposed above - take an Android phone known to support PD, take a known to support PD USB type C cable, connect those to PBP, and configure the phone to provide power to PBP--if PBP starts charging then there is most definitely PD charging on the PBP. Like I said before, I don't have either the phone or cable like that handy, so if someone else could try that it would be awesome.