MCU can't be recognised

MCU can't be recognisedhttps://devzone.nordicsemi.com/f/nordic-q-a/42367/mcu-can-t-be-recognisedWe are using NRF51822 MCU on our PCB design and we have a problem that we can’t program it, uKeil doesn’t recognize MCU. It seems that then we start programing NRF51822 it stays in reset mode, because before start of programing it sink 3mA current anden-USTelligent Community 13Mon, 14 Jan 2019 09:21:59 GMTRE: MCU can't be recognisedhttps://devzone.nordicsemi.com/thread/165373?ContentTypeID=1Mon, 14 Jan 2019 09:21:59 GMT137ad170-7792-4731-bb38-c0d22fbe4515:daba4fd5-6d70-4296-842d-af352711d51aHåkon Alseth<p>Hi,</p> <p> </p> <p>What programmer (and what software to program) are you using?</p> <p>Some programmers have a set voltage requirement (3.3V), and will not work with lower voltages.</p> <p></p> <p>Kind regards,</p> <p>Håkon</p><div style="clear:both;"></div>