CH340N_π122U31_isolated serial port

I made it more than half a year ago. I only used it for a few days~~ and then I couldn't find it~~ I packed up my things and dug them out. I feel like I can probably get some water and read it [π122U31 chip manual](https://item .szlcsc.com/478032.html), and then you can understand what this is. Because it was drawn casually, and there is no hollow in the middle, it definitely cannot achieve the high-voltage isolation mentioned in the chip manual. It is okay for low-voltage use, and the poster is wrong. There is no guarantee of its performance, and it is not responsible for any suicide attempts. The isolation chip has its own level conversion. Although the range is only 3.0~5.5V, it can also be used as a serial port with level conversion; if you don’t want to be on the right every time You can also connect a 5V to 5V isolated power module to a power supply! [photo_2022-01-22_20-50-51.jpg] ![photo_2022-01-22_20-56-14.jpg]