adc input voltage - NRF52

[Bryan H]

What is the maximum input voltage for the ADC on the NRF52. I found answer for the NRF51 but nothing definitive on the NRF52. I have a photocell (or LDR) to sense light (used to tell when an LED should turn on and off). It is running at VCC which is 3.3V in my case. When I did this on NRF51, I brought the voltage down to 2.4 through a voltage divider to both stay under the 2.4 max (without scaling) and to reduce current. On the NRF51, I basically had resolution on the ADC input between 0v and 1.2v ( reading from 1.2-2.4 was shown as the maximum). Is the information the same for NRF52? I want as much resolution as possible on the ADC input. Thanks, Bryan

[Sigurd]

With the SAADC you have full scale input range (0 to VDD). In addition to the SAADC example in the SDK(SDK_INSTALL_FOLDER/examples/peripheral/saadc), we also have more examples on Github. We also have a blog post here, where the SAADC is used to measure the voltage of a lithium battery.

[Bryan H]

Thank you for your help! The example answered my questions and I have successfully implemented SAADC on my project. Thank you!