WCH-linkE

I usually need a downloader when downloading programs for microcontrollers. I saw that Qinheng has released WCH-link, and I feel that it is pretty good. Both 51 and 32 can be used.
But sometimes the USB interface in the microcontroller is far away, and the connection quality will decrease when the Dupont cable used for downloading is long. I think it is difficult to find a 1-meter-long Dupont cable, and basically everyone has a 1-meter-long data cable.
I changed it to a smaller version of WCH-link that uses the Type-C interface. Recently, I found that two new versions of link have been released, so I also changed linkE.
The schematic diagram is consistent with the official LinkE WCH-LinkE-R0-1v3 version.
There are two PCBs, one is two-layer and the other is four-layer. I have not verified the second floor, but the fourth floor has been done.
The output current control uses the same CH217 as the original version. Now there are 1.9 pieces on Taobao. If it is too expensive, you can solder a 0 ohm resistor. I widened the corresponding pad to facilitate the soldering of the resistor.
(Actually, I thought about using other chips instead, and even almost placed an order to buy the chip. But when I checked the circuit two days ago, I suddenly found that the chip I was looking for was high-level enabled, and
CH217 was low-level enabled. Someone has found a replacement chip on the open source platform, but it is currently out of stock on Lichuang.)

It seems that CH32V305FBP6 cannot be downloaded directly using USB. You have to use another WCH-Link to download the firmware. For the download method, see page 13 of the instruction manual.