CH340G board

by luca
A new, updated version of this board is now available and it’s described in this blog post.

On this site I’ve already posted about the CH340G chip, manufactured by a chinese company and often adopted as a cheap solution when a USB -> serial converter is needed.

As the chip package (SOP16) is quite easy to solder, I ordered some ICs from AliExpress and I designed a minimal demoboard, based on the reference schematics:


You can download Eagle files (both schematics and board) in my Github repository.

I used Seeedstudio’s FusionPCB service to manufacture the PCBs (if you want to learn how to use it for your PCBs you can follow my tutorial) and hare are some photos of the first prototype:



To verify if it works, you can connect the TX and RX pins with a jumper;  if you open a serial terminal, you should see each character you type:


In the end, here’s the link to the WCH official website where you can download the drivers.

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Antonio Campese Monday March 2nd, 2020 - 09:45 AM

Ciao Luca, buongiorno. Sono sicuro che a te la scheda funziona. Nel datasheet il piedino 4 (V3) è collegato a un condensatore e il condensatore al +3,3V. Il tuo C1 è collegato direttamente a massa. C’è un motivo? Grazie mille anche e soprattutto per queste lezioni.

luca Tuesday March 3rd, 2020 - 09:58 AM

ciao Antonio, in effetti ho trovato disparità sui vari datasheet che trovo in rete… in alcuni collegano il pin a massa, in altri a 5v. Probabilmente è messo per filtrare eventuali oscillazioni sull’alimentazione quindi in condizioni normali non ha molta importanza.

Antonio Campese Thursday March 5th, 2020 - 02:14 PM

Grazie mille


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