NRf5340DK IO pins voltage level

[AlaBek]

Hello,
I want to know what voltage level are the pins on DK5340 , I am using USB cable for power supply. I read that the DK is compatible with ARDUINO REV3, so does that mean it supports 5v? 
Regards 

[Kazi Afroza Sultana]

Hello,

The nRF5340 DK has a 5 V boost regulator.

''It gives a stable 5 V output from the following sources:

• USB connector J2 for the interface MCU
• USB connector J3 for the nRF5340 System on Chip (SoC)
• Lithium-polymer (Li-Poly) battery connectors (J6 or P27)
• VIN 3–5V pin on P20''

https://infocenter.nordicsemi.com/topic/ug_nrf5340_dk/UG/dk/5V_power_sources.html?cp=4_0_4_4_2_0 

In normal voltage mode, the GPIO high level equals the voltage supplied to the VDD pin. In high voltage mode, it equals the level specified in the VREGHVOUT register.

You can see the recommended operating value of VDD here https://infocenter.nordicsemi.com/topic/ps_nrf5340/chapters/recommended_op_conditions/doc/recommended_op_conditions.html?cp=4_0_0_9