https://devzone.nordicsemi.com/f/nordic-q-a/36425/vdd-referenceHello, I&#39;m confused what the NRF51422 uses for it&#39;s digital IO reference. So for example, If I use a 3.0V coin cell battery through its DC/DC converter: 1. What voltage does the DC/DC output going to the analog reference pin? 2. What would the chip useen-USTelligent Community 13Mon, 16 Jul 2018 16:51:23 GMThttps://devzone.nordicsemi.com/thread/140271?ContentTypeID=1Mon, 16 Jul 2018 16:51:23 GMT137ad170-7792-4731-bb38-c0d22fbe4515:c89b8809-e5c1-490c-8dec-69795d189f61AmbystomaLabs<p>Absolutely everything is in the product spec.&nbsp; nRF51 Series Reference Manual.</p> <p><a href="http://infocenter.nordicsemi.com/index.jsp?topic=%2Fcom.nordic.infocenter.nrf51%2Fdita%2Fnrf51%2Fpdflinks%2Fref_manual.html">infocenter.nordicsemi.com/index.jsp</a></p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/140265?ContentTypeID=1Mon, 16 Jul 2018 16:31:09 GMT137ad170-7792-4731-bb38-c0d22fbe4515:ae1c86c3-0755-4578-8efa-46d7a481c3a0tmurcko<p>Gotcha - I did not realize there was a prescaler you can use. Can you forward the documentation on that prescaler? I was having trouble finding it.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/140114?ContentTypeID=1Sat, 14 Jul 2018 11:30:33 GMT137ad170-7792-4731-bb38-c0d22fbe4515:02f65dc8-0518-4ef3-b649-8c53fb026b5bAmbystomaLabs<p>The best and easiest way to use the ADC is to configure it to use its internal 1.2volt bandgap reference.</p> <p>Then you configure the prescaler such that the sample voltage falls within 0 to 1.2volts.&nbsp;</p> <p>No matter how you configure the prescaler the input sample voltage cannot exceed Vdd_nRF.</p><div style="clear:both;"></div>