bipolaronMar 22

Let's talk #USB PD negotiation chips that you can stick into your project.

I've been avoiding PD negotiation because I don't want to read the spec for implementing it, nor do I want my project MCU to have to power up in phases I have to contemplate. I also don't understand if I can supply 20V and also use it for communication.

It finally occurred to me that this is probably a chip I can just buy. I found this list of some options, have you used any in your projects?

https://www.chargerlab.com/twenty-five-pd3-1-protocol-chips-and-their-manufacturers-a-chargerlab-analysis/

Show threadSteve Pomeroy
@bipolaron Adafruit has started using some in their products. I'd personally start there and crib from them. Sparkle Motion is one of the latest that does.
Mar 22 at 5:28amMastodon for Android
Show threadbipolaronMar 22

@xxv Huh, that's pretty convenient. https://www.adafruit.com/product/6033

Although the price of a PD USB supply that can do 20V (which I believe mandates 45W or higher) is probably way higher than a 24V wall wart.

And it looks from the standard like you cannot use the data lines if you are using a PD system because the computer can't supply higher voltages anyway.

I guess adding a boost converter to my systems isn't that bad, but unfortunate I can't just add a $0.50 part to up the power supply voltage.

USB Type C PD to 5.5mm/2.1mm Barrel Jack Adapter - 20V

This convenient adapter lets you plug a USB Type C 3.1 5V cable into something with a 5.5mm / 2.1mm DC barrel socket.Works great with any device or cable with 5.5mm / 2.1mm DC ...