![]() ![]() Using the search program "Search Everything" I searched for all instances of AVRDude.exe on my development system as many programs and IDE's use it, then renamed (i.e. Just to confirm AVRDude 6.3 fully supports the CH341A programmer. It mean, it always use 3V3 for communication with eeprom. As far as I understand, that mean, that chip have internal 3.3V regulator and IO pins are NOT 5V tolerant. The operating voltage of other circuits connected to the chip cannot exceed 3.3V. When working with 3.3V voltage, the V3 pin of the CH341 chip should be connected to the VCC pin, and an external 3.3V power supply is input, and the CH341 core is connected. When using a 5V supply voltage, the VCC pin of the CH341 chip inputs an external 5V power supply, and the V3 pin should be externally connected with a power supply decoupling capacitor of 0.01uF to 0.1uF. Hi, The trick is, that you miss 2 nd LDO, that is inside CH341A chip.
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