![]() 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. My question is, is it safe to just do the short-circuit without removing the 1117 linear regulator? Hi, The trick is, that you miss 2 nd LDO, that is inside CH341A chip. I can use the hot air station to remove the 1117 and then short-circuit the input with the output. One simple solution to fix this issue is to simply bypass the 1117-3.3V regulator. There are no limiting series resistors on those signals. So all I2C and SPI signals are 5V while the external memory is powered at 3.3V. Source: All Vcc connections in the ZIF socket are 3.3V but the CH341A is powered at 5V. Someone already did the schematic of this board (atached). ![]() I bought one cheap chinese CH341A serial memory programmer black PCB (see attached picture).
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