Problem with CH340C

Thread Starter

aliycherif

Joined Oct 23, 2020
7
Hi I made a board that contains an ESP32-WROVER and an USB to serial adapter ch340c but it's not visible when I connect it to the PC (Windows 10).
I tried to install the ch340 driver and I even tried 7 USB cables but the problem still remain.

So maybe I have a mistake in the design ?

PS: 3.3V comes from a ferrit bead.
probleme.png
 

ericgibbs

Joined Jan 29, 2010
11,156
hi ali,
Have you compared your CH340 connections to a regular Arduino Uno.
Are you using a 32bit or 64bit PC.?
E
BTW: What is connected to X1 X0 on the CH340.???

Added CH340 d/s
 

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Thread Starter

aliycherif

Joined Oct 23, 2020
7
I compared it to the Wemos LOLIN D32 Pro schematic.
Arduino Uno use the ch340g and 5v to power it . In my case , I use the ch340c (It doesn't require an external Oscillator) and 3.3v to power it.
I use 64 bit PC.
 

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Thread Starter

aliycherif

Joined Oct 23, 2020
7
It is mentionned in the datasheet that the decoupling capacitor 0.01 uF should be connected to V3 only when it is powered with 5v.
datassheet.png
 

Thread Starter

aliycherif

Joined Oct 23, 2020
7
Have you probed for 3.3v on the board? It’s possible you have a bad solder joint. Please post a picture of your board.
the board have been manufactured by jlcpcb. I probed for 3.3v everything seems okay and the ch340c is powered up but the Pc don't detect it.
 
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