FW16 Schematics need updating

[jcdutton]

Hi,

I have looked at the FW16 schematics here:
https://github.com/FrameworkComputer/Framework-Laptop-16/blob/main/Mainboard/Mainboard_Interfaces_Schematic_Framework_Laptop_16_7040_Series.pdf

The power to the USB ports is provided by at SY8370C chip.
One for +5V ALW A, that feeds 3 USB ports, and another +5V ALW B, that feeds the other 3 USB ports.
The SY8370C can output 11A.
So that should be enough for 15W from every USB port at the same time.
But the FW16 can only do 15W from one USB port at a time.

Please update the schematic to match what the FW16 can actually do.

[JohnAZoidberg]

Sorry what exactly do you think is wrong on the schematic?

[jcdutton]

What is wrong with the schematic?
"The power to the USB ports is provided by at SY8370C chip.
One for +5V ALW A, that feeds 3 USB ports, and another +5V ALW B, that feeds the other 3 USB ports.
The SY8370C can output 11A.
So that should be enough for 15W from every USB port at the same time."
So, the existing schematic implies that 15W should be available from every USB port at the same time.
But, the FW documentation here, says it cannot.
https://knowledgebase.frame.work/expansion-card-slot-functionality-on-framework-laptop-16-amd-ryzen-7040-series-rkUjGm7cn
"Ports 1,2,4,5 are shared on a first come first serve basis. So they are 1.5A by default, but one port from any of these can negotiate 3A over PD. Once that is taken, the other ports are limited to 1.5A. Ports 3,6 are 900mA."

So, my assumption that either the schematic is wrong, or the FW documentation is wrong.

Now, why do I wish to know the answer to this?
If the FW16 schematic and PCB can actually handle 15W to every USB port, but the EC firmware is limiting it to only one port at 3A, I could change the EC firmware source code and enable 15W on every USB port. But if there is some hardware constraint that I am unaware of, I could avoid potential damage to the PCB / Mainboard if I knew what that constraint is?

Why do I even need 3A to every port? Maybe I wish to plug in two USB4/Thunderbolt NVME enclosures that use 10W each and copy data between them, while the FW16 is plugged into a 180W PSU.