From the datasheet below:
Mode 1: 1.8 V to 5.5 V External Supply
In this mode, the PSoC 4000S is powered by an external power supply that can be anywhere in the range of 1.8 to 5.5 V.
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how about the io voltage, will that be 1.8V or 1:1 with the supplied rail, ie 3.6-4.2v running off a lipo battery!?