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Most USB2UART Bridges using 3,3V or 5V from USB.
The FTDI is a good choice with high modularity and voltagelevel choice.
A good alternative is a bridge with a CP2104 chip from Silicon Labs.
These USB to serial adapter supports also 1.8V and most bridges with this chip have a buildin jumper to plugin an external voltage for the logiclevels.
just google for 'USB to UART Bridge CP2104' there are many hits.
But it must be a cp2104, the cp2102 is not capable of 1,8V.
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