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nRF5340 - How to enable High Voltage mode

Hi,

I've developed a custom board with nRF5340-QKAA (see schematic sheet attached).
nRF5340's VDD pins are not tied to VDDH pin, then I assume the nRF5340 automatically starts in High Voltage mode.
In my design I use
VDD_HV = 5.00 V
When the board is powered up I get
VDD_nRF = 1.77 V
Q1: Is this value compatible with the High Voltage mode operation ?
Q2: How to increase VDD_nRF to 3.3 V ? Is there some special configuration switch in Zephyr ?
Thanks
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