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Schematic of CH340E USB-Serial Adapter
does the ch340e have a voltage regulator integrated to have a 3v3 output?
R

rafalozano

@copilot does the ch340e have a voltage regulator integrated to have a 3v3 output?
2y

copilot

Yes, the CH340E chip does have an integrated voltage regulator that can provide a 3.3V output. This is indicated in the project by the connection of the IC1 pin 10 (V3) to the +3V3 power net. Here’s how it’s typically connected in your project:
  • IC1:V3 connects to +3V3:P1 (and subsequently to various points in the circuit that require 3.3V).
This means that the CH340E is capable of taking in a higher voltage (such as 5V from USB VBUS) and regulating it down to 3.3V for its own use and for external components that require 3.3V. This feature can be very useful for systems that need a 3.3V supply alongside USB communication capabilities.
2y
2
J2

CH340E USB-Serial Adapter