https://devzone.nordicsemi.com/f/nordic-q-a/51830/difference-between-reference-designs-of-nrf52840Was looking through the reference designs you have in github . I figured the difference between nRF52840_qiaa_var1 (what is qiaa ?) and nRF52840_qiaa_var2 is the use of the DC/DC converter. I cant find any difference between the rest and var2 .. allen-USTelligent Community 13Fri, 06 Sep 2019 08:27:23 GMThttps://devzone.nordicsemi.com/thread/208406?ContentTypeID=1Fri, 06 Sep 2019 08:27:23 GMT137ad170-7792-4731-bb38-c0d22fbe4515:773711a8-924e-462c-a502-836eaf2085d0Andreas<p>Hi,</p> <p>&nbsp;</p> <p>As described in <a href="https://github.com/NordicPlayground/nrf5-eagle-reference-design">github</a> these Eagle reference designs are not the official, verified and regularly maintained reference designs. The difference between the variants are described in the <a href="https://infocenter.nordicsemi.com/topic/ps_nrf52840/ref_circuitry.html?cp=3_0_0_6_2">PS</a>, Altium reference layouts are found in the <a href="https://www.nordicsemi.com/Products/Low-power-short-range-wireless/nRF52840">product pages</a>.</p> <p>&nbsp;</p> <p>best regards,</p> <p>Andreas</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/208349?ContentTypeID=1Thu, 05 Sep 2019 22:10:25 GMT137ad170-7792-4731-bb38-c0d22fbe4515:01a2f0be-5a41-48a6-a987-2246fe52be07awneil[quote userid="16704" url="~/f/nordic-q-a/51830/difference-between-reference-designs-of-nrf52840"]what is qiaa[/quote] <p>they are the bit of the part number that identify package &amp; memory size:</p> <p><a href="https://infocenter.nordicsemi.com/topic/ps_nrf52840/ordering_info.html?cp=3_0_0_9">https://infocenter.nordicsemi.com/topic/ps_nrf52840/ordering_info.html?cp=3_0_0_9</a></p><div style="clear:both;"></div>