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CH341A Programmer

Overview

The programmer uses the CH341A+RS0108YQ20 solution.
Front view:

Back view:

Notes:
1. Spare pads for ports A and C are provided; you can choose to solder them according to your needs (the positioning posts must be cut off before soldering both interfaces).
2. Spare 2.54mm header pins for easy programming with DuPont wires.
3. Regarding the level indicator, multiple LED indicators are cumbersome; it's better to judge by LED brightness.
4. Regarding pin 9 of the CH341A, the manual states:

The project includes two projects, "No Level Conversion" and "Level Conversion." In the "No Level Conversion" project, pin 9 is connected to VCC, but when programming 5V chips, VCC will have a 5V voltage, which does not conform to the manual specification. This has no impact in actual use (long-term stability is unknown). It is recommended to modify it yourself or use the "Level Conversion" project.
5. Further details about the programmer are omitted; other experts have written very detailed explanations.
Caution:
The locking socket chip direction is opposite to the existing product chip direction; be careful not to install the chip backwards!

2024.09.18: Added RST pin to "Level Conversion".

Design Files

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It is your responsibility to test the circuit yourself and determine its suitability for you. EEWorld will not be liable for direct, indirect, special, incidental, consequential or punitive damages arising from any cause or anything connected to any reference design used.

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Update:2026-03-28 20:50:41

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