It is a compact board with powerful 8 bit MCU. Uploading software is quite simple via USB and there are opensource tools to that from Linux as well (make sure you use the right upload option that matches CH552 bootloader version!). The plus point is this MCU can interface old 5V TTL chips and have active communication with host PC over USB. I gave only 4 stars because there is no schematics for this board on the Wiki site (there are some schematic for 55X boards, but not for this one). The MCU should be able to operate using 3.3 Volts (and have 3.3 logic levels on GPIO pins), but the board does not seem to let you do that (at least without mods, I guess that’s why we have the 3v3 LDO on the board). Also be aware this board does not fit to a breadboard!
Ralph Doncaster (verified owner) –
I tested the CH551 and the CH552. Both are great little boards.
http://nerdralph.blogspot.com/2020/07/getting-started-with-wch-ch551-and-ch552.html
I think the CH552/554 board could do without the 3V3 regulator, since the chips have a builtin 3v3 LDO.
olin (verified owner) –
It is a compact board with powerful 8 bit MCU. Uploading software is quite simple via USB and there are opensource tools to that from Linux as well (make sure you use the right upload option that matches CH552 bootloader version!). The plus point is this MCU can interface old 5V TTL chips and have active communication with host PC over USB. I gave only 4 stars because there is no schematics for this board on the Wiki site (there are some schematic for 55X boards, but not for this one). The MCU should be able to operate using 3.3 Volts (and have 3.3 logic levels on GPIO pins), but the board does not seem to let you do that (at least without mods, I guess that’s why we have the 3v3 LDO on the board). Also be aware this board does not fit to a breadboard!