USB PD Stand-alone Sink Controller

DRANK

Since USB-C’s introduction, I’ve been consistently interested in leveraging it for powering everything under 100 watt (or rather under 90 watt, since it’s hard to come by a full 100 watt USB-C power brick). I finally found time to make the first move and this is the subject of the post.I wanted to keep it simple at the start. Chips like the popular FUSB302 which only provide the wire level handling of the USB-PD protocol, require a lot of software work to make them reliably operational. And that software will need to run on a µC which adds to BOM. So I went to search and found a gem called STUSB4500 from STMicroelectronics. In short, you program some registers to chip’s NVM via I2C once which define what voltage range/current you require and the chip will negotiate those requirements with a charger connected to it.Second version. The black cable goes to the laptop connector.With the perfect foundation in hand, I set out to design a minimal but practical board that I could use with…