Using CT-3 to test DFPs with power sharing

RLB

DFPs with power sharing only advertise PDOs with the maximum power being the total charger power rating divided by the number of ports.  For example a 50W charger will advertise PDOs for each port that do not exceed 50W/2 or 25 Watts.  You would see PDO1: 5V@3A (15W) ; PDO1: 9V@2.77A (25W); PDO3: 15V@1.67A (25W) & 20V@1.25A (25W), however, the module could provide more, up to a maximum of 50W.  According to the PD spec this is the way a DFP (charger) must intitally work.  I want to know if there is a way to get th te CT-3 to read the PDOs, but then ask for a PDO that exceeds the advertised level?  Is this something you are currently aware of and are working on?  I will see if I can gather more information on the proper PD message transacton(s) for doing such a thing from the supplier of the PD chipset I am using, and share that information with you as I receive it.

21-09-10 update: zip file uploaded containing CT-3 capture during Mac Book charging (model A2141).  Excel file contains synopsis of charging session with observations.  Can CT-3 be made to emulate Mac book?

Image: How CT-3 sees the charger we are developing...

How CT-3 sees our charger