I could be wrong too, but this is my understanding.
-
The way Sparkfun intend the USB-C PD to be used.
-
The way I think Aaron wants it to work.
The Sparkfun board is programmed to say it has 5V/5A to the Pi 5. I think there are smarts in the PMIC chip that wont allow this to happen.
VDD is the power for the I2C interface to the Arduino board.
The following is from the Sparkfun schematic. Proper current flow is from VIN to VSNK, you cannot connect the Meanwell to VSNK and expect it to work in reverse. The mosfet diode would be forward biased.
Anyway hope all this makes sense.
Most of this is just me reading the how to, analysing the schematic and the USB-C standard.
Regards
Jim
