UM1 USB to UART converter

UM1 USB to UART converter is designed for easy UART communication. It has a wide range of Vref voltage and allows communication in 1.8v, 2.5v, 3.3v and 5v standard signal levels.
Features:
• CH340 USB controller
• Buffered UART port. Vref 1.65V – 5.5V
• Programmer is powered by 5V from USB
• 2.54mm pitch 4-pin UART header
• Small PCB outline
• 2.54mm pitch cable included
Instructions:
UM1 USB to UART converter has CH340 USB controller onboard. The controller is connected to buffer ICs. Buffer ICs are needed to amplify the driving current and widen the supported voltage levels. Buffer ICs are connected to 4 pin UART header, with a 2.54mm pitch. The converter is powered by 5v from USB, but still, external Vref voltage must be connected. Vref voltage must match UART signals voltage. The converter can work with Vref from 1.65v to 5.5v. This includes 1.8v, 2.5v, 3.3v and 5v standard signal levels.

Documentation