USB-C Port Power Behavior

[mongo]

The three @Cybertruck USB-C ports have four PD profile options which behave as follows:
1 or 2 devices connected: 65W max each
5V@3A, 9V@3A, 15V@3A, [email protected]

3 devices connected: 42W max each
5V@3A, 9V@3A, [email protected], [email protected]

So, if you are using a high power devices like a Starlink Mini or fridge, don't use the third port.

This may explain why some people have issues with Starlink Mini and some don't since those cords use 20V@3A or [email protected] profiles. (Official cable is 100W 20V@5A, so doesn't initialize)

The ports all refresh their profile when a new device is connected which might cause a temporary dropout.

Test setup with three protocol analyzers and 75W of total load.

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[CyberSav]

Interesting behavior... Kinda wish they were all equal. My last car had 6 USB-C ports, all 6 were capable of delivering 100W. At the same time.

 

[mongo]

Interesting behavior... Kinda wish they were all equal. My last car had 6 USB-C ports, all 6 were capable of delivering 100W. At the same time.

Yeah, design trade offs.
The console control board runs all three and seems to have a 130W limit (excluding inductive chargers) along with 3A limits on each converter.
With the 48V architecture, six 100W ports would require an additional 12 Amps or so of capacity from the MV power system.
With PD communication, they could be more flexible in terms of allocation. Boost the port current to 5A and it could gave one at 100W and one at 35W.

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