multi-voltage USB dual UART
A CP2105 based USB UART adapter with two ports at CMOS signal levels.
What's special about this board is that the logic level voltage for the UART ports can be selected by a rotary switch to either 1.8, 2.3, 2.5, 2.8, 3.0 or 3.3 Volts. This is extremely useful in a lab-type setup where you often have to connect to the UART of embedded devices at a variety of different voltage levels.
The UART signals for each of the two ports feature RxD/TxD, RTS and CTS lines and have full ESD/TVS protection diodes.
In addition, some GPIO signals are available on an extension header.
NOTE: This product does not include a USB mini-B cable. It ships as bare PCB assembly as shown o nthe picture.
You can find more information (including schematics and PCB layout) about this open hardware project at https://osmocom.org/projects/mv-uart/wiki