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power connection in normal mode

Hello,

I planned to to use in my design 1.8V. But for redusing power consumption of nrf5340, which way is correct and prefferable: 

1. Use external 1.8V supply in normal mode, when VDD connected to VDDH;

2. connect external voltage to VDDH(3V) and use internal VDDOUT 1.8V(High voltage mode).

one more question...

For program nrf53 should i use voltage level shifter, if my supply is 1.8V

Beforehand thanks,

Arsen

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