Use of ADC to measure Battery voltage

[Shimon_nohayo]

Hi,

I'm using SDK 15.2.0

I need to measure the voltage in AIN3 and I would like ot know what is the difference between ADC SAADC and SAADC legacy layer.

The system is a very low power system and I need sporadically measure the ADC ( no timer needed 

[Jørgen Holmefjord]

Hi,

SAADC legacy layer is used to allow legacy applications to use the new NRFX drivers with the legacy API. I do not know what you are referring to with ADC SAADC, please elaborate.

Best regards,
Jørgen

[Shimon_nohayo]

Hi,

Now I understand better.

It seems that the SAADC evt consume ~1mA , Can you guide me on how to operate the ADC only in demand. I need to sample the ADC only once in a few hours 

Shimon

[Jørgen Holmefjord]

If you require the SAADC to sample only every few hours, you can unit it after completed sample. There is a low_power_mode in the driver that handle this for you. A low power example is available in this GitHub repository.

[Shimon_nohayo]

Hi,

Thank you the example is very helpful, 

 - How do I define the SADC Vref to be internal?

BR,

Shimon 

[Jørgen Holmefjord]

This is done on line #220 of main.c in that example.