https://devzone.nordicsemi.com/f/nordic-q-a/15842/can-instable-vdd-cause-nrf51-not-turning-onI have issue with nrf51 booting, i noticed that sometimes when i plug the power to (VDD and GND) the system dosent turn on at al. 1 - how does the system the whole system turn on? (just by receiving the first impulse?) 2 - can the system not turnen-USTelligent Community 13Fri, 19 Aug 2016 09:17:05 GMThttps://devzone.nordicsemi.com/thread/60476?ContentTypeID=1Fri, 19 Aug 2016 09:17:05 GMT137ad170-7792-4731-bb38-c0d22fbe4515:1b46ad64-d070-4df7-98dc-d0341c8c1f36Ole Bauck<p>The supply rise time (0V to VDD) needs to be less than 100ms for the on-chip power-on reset circuitry to function correctly, see <a href="http://infocenter.nordicsemi.com/pdf/nRF51822_PS_v3.2.pdf">Product Specification</a> table 20 in chapter 7. May this be the case?</p><div style="clear:both;"></div>