The more energy-efficient way to implement ADC - nRF52840 SDK16

[Nikosant03]

Hi, I want to use the ADC peripheral (SKD16) and I am looking for the most energy-efficient way of doing this. I design a prototype that will be based on nRF52840 IC and will be powered on by coin cell battery, so energy consumption is crucial. At the moment, I am using the SAADC example where I have initialized a timer and PPI to propagate compare events.

However, I've written that the timer driver is more power-hungry since it is running on 16MHz while RTC is less, running on 32.768KHz. 

I will use a low sampling rate (100Hz). Also, the data will be dispatched over BLE (so I will use the soft device). So my question is: what is the more energy-efficient and robust approach of using the SAADC peripheral to perform ADC?

Thanks in advance

Nick

[Jørgen Holmefjord]

Hi,

Please have a look at this example. I have not been updated to SDK 16 yet, and it has not been fully verified on SDK 15, but it should show you how to get to the lowest power state of sampling SAADC:

Best regards,
Jørgen

[Nikosant03]

Thanks Jorgen,

I will try and return with feedback ASAP

Nick