Saadc

RE: Saadc

Andrea Rossi — Tue, 19 Apr 2022 14:15:52 GMT

Understood.

Thanks again

RE: Saadc

ketiljo — Tue, 19 Apr 2022 14:14:23 GMT

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.

RE: Saadc

Andrea Rossi — Tue, 19 Apr 2022 13:59:25 GMT

Ok, thanks.

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

RE: Saadc

ketiljo — Tue, 19 Apr 2022 13:52:57 GMT

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

RE: Saadc

Andrea Rossi — Tue, 19 Apr 2022 12:38:57 GMT

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

RE: Saadc

ketiljo — Tue, 19 Apr 2022 08:35:22 GMT

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.