Silicon Labs CP210x: I am using it by supplying 3.3V to the VDD pin, but can I leave the REGIN pin unconnected?

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Silicon Labs CP210x: I'm using the VDD pin with 3.3V power, but can I leave the REGIN pin unconnected?

CP21xx

To prevent malfunction, do not leave REGIN (VREGIN) unconnected. Make sure that there is no voltage difference between REGIN (VREGIN) and VDD as in the self-powered circuit in the datasheet.

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