https://devzone.nordicsemi.com/f/nordic-q-a/14005/just-curious-why-vcc-max-is-spec-d-at-3-9-well-not-4-2Hello, It just a diode drop away from 3.9 to 4.2, and 20% typical of a Lipo discharge, just wondering whether the IC design and process is really that tight. The nRF52 runs on a wide dc Vcc range, I especially like the low voltage side, this showsen-USTelligent Community 13Tue, 24 May 2016 01:09:55 GMThttps://devzone.nordicsemi.com/thread/53478?ContentTypeID=1Tue, 24 May 2016 01:09:55 GMT137ad170-7792-4731-bb38-c0d22fbe4515:9b7a778d-96c7-4272-9500-a938c55cc1baFI<p>Thanks for the clarification. Regards</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/53477?ContentTypeID=1Mon, 23 May 2016 10:53:12 GMT137ad170-7792-4731-bb38-c0d22fbe4515:46a017e5-59b2-405b-8013-a7fb4604c3d7Stian R&#248;ed Hafskjold<p>Well, 3.9V is not really within spec. <strong>3.6V</strong> is the max recommended operating voltage: <a href="http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.nrf52832.ps.v1.0/recommended_op_conditions.html?cp=2_2_0_4#concept_vng_xls_2q">infocenter.nordicsemi.com/.../recommended_op_conditions.html</a></p> <p>3.9V is from the absolute maximum before you brick the chip: <a href="http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.nrf52832.ps.v1.0/abs_max_ratings.html?cp=2_2_0_3#abs_max_ratings">infocenter.nordicsemi.com/.../abs_max_ratings.html</a></p> <blockquote> <p>Maximum ratings are the extreme limits to which the chip can be exposed for a limited amount of time without permanently damaging it. Exposure to absolute maximum ratings for prolonged periods of time may affect the reliability of the device.</p> </blockquote><div style="clear:both;"></div>