Plug-n-play USB Type C dummy PD

USB C has a nifty power management system where, by default, you can get a classic 5V at 1A power out from a power supply or port, but with some fancy twiddling you can request higher voltages and currents. We’ve always wanted a simple breakout that could get you a range of voltages using just jumper pads, but didn’t have a lot of luck with IP2721. Then we found this chip – the HUSB238 (https://en.hynetek.com/pdsink.html) – used in a USB-to-DC cable and it seems kinda perfect! It can do 5V to 20V with just a resistor setting, and also set the current too. There’s also an I2C interface that can be used to set them, although its unclear if the settings are persistent – we’ll have to try it out. There’s a library here if you want to see what the registers are like (https://github.com/ltyridium/HUSB238-lib) here’s our draft for a breakout design. Whatcha think? Any other PD sink controllers you like to use?

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