Saadc

You can measure higher voltages if you use an external voltage divider, like this: https://devzone.nordicsemi.com/nordic/nordic-blog/b/blog/posts/measuring-lithium-battery-voltage-with-nrf52

Remember that the voltage on any pin must be lower than VDD+0.3 V.

Thanks for this hint.

But is there a possibilities to measure an higher voltage directly with nrf? I'm powering a sensor with 5V, and I would like to know if it is possible to use that 5V source also as external reference for the saadc.

Thanks again

Thanks for this hint.

But is there a possibilities to measure an higher voltage directly with nrf? I'm powering a sensor with 5V, and I would like to know if it is possible to use that 5V source also as external reference for the saadc.

Thanks again

No, the ADC can't measure higher voltages than VDD, unless you divide it. 

Ok, thanks.

And VDD must be max 3.3V, must it? Or can I use an higher voltage for VDD( so 5V)?

VDD is max 3.6 V, please see the documentation: https://infocenter.nordicsemi.com/topic/com.nordic.infocenter.nrf52832.ps.v1.1/recommended_op_conditions.html#concept_vng_xls_2q

Anything above this _will_ break the device. 

Understood.

Thanks again