USB PD - CC decoding adventures part 2

RE: USB PD - CC decoding adventures part 2

scottiebabe — Mon, 20 Mar 2023 15:30:34 GMT

We all learn by experimenting! I believe device discovery occurs with vbus unpowered so the op-amps input esd diode may load the cc lines before vbus is applied. Likely not enough to cause a problem, but something to consider in the future. Happy probing!

RE: USB PD - CC decoding adventures part 2

shabaz — Sun, 19 Mar 2023 17:03:29 GMT

Hi Wolfgang,

Great work! Thanks for setting it up as a project where the boards can be ordered easily. This will be something I will try to construct at some point too, to learn about the messaging with PD chips.

This color option looks really good!

RE: USB PD - CC decoding adventures part 2

baldengineer — Sun, 19 Mar 2023 16:17:13 GMT

It's great to see a follow-up to your previous post. And the board does look great in After Dark!

On the schematic, I noticed you labeled D- and D+ opposite of the connector's pinout. Was this intentional? (I suppose it does not matter since it is straight through.)

RE: USB PD - CC decoding adventures part 2

wolfgangfriedrich — Sun, 19 Mar 2023 16:07:11 GMT

There is an Easter egg hidden in the post, which caused me some grief.