https://test-devzone.nordicsemi.com/f/nordic-q-a/88508/new-design---noisy-intermiitent-supply-nrf52840-qiaaNew design and I have a weird behaviour on the low voltage output of the internal LDO for CPU . I have monitored DEC1 voltage on scope Thats all the supply pins, VDD-CPU is supplied from a 3.3V regulator that is completely stable- no noiseen-USTelligent Community 13 Non-ProductionTue, 07 Jun 2022 08:07:03 GMThttps://test-devzone.nordicsemi.com/thread/371057?ContentTypeID=1Tue, 07 Jun 2022 08:07:03 GMT137ad170-7792-4731-bb38-c0d22fbe4515:0d05fcd5-0a49-434c-8a8f-3e67b88c152cuser77059<p>Okay,<br /><br />glad you solved it!<br /><br />Closing the case for now, reopen if needed.<br /><br />Best regards,<br />Kaja</p><div style="clear:both;"></div>https://test-devzone.nordicsemi.com/thread/370982?ContentTypeID=1Mon, 06 Jun 2022 07:34:19 GMT137ad170-7792-4731-bb38-c0d22fbe4515:2035c327-e147-477f-8d93-042791cb029buser112826<p>Thankyou for your reply.&nbsp; Its seemed to be confined to one of the Dev boards - others are not exhibiting this issue, so I am guessing a soldering issue</p><div style="clear:both;"></div>https://test-devzone.nordicsemi.com/thread/370802?ContentTypeID=1Fri, 03 Jun 2022 07:14:36 GMT137ad170-7792-4731-bb38-c0d22fbe4515:93a1c23f-d2b4-4c21-82ef-392e48bceacauser77059<p>Hi David,<br /><br />could you upload the full schematic and layout files? If you want it to be private, please change the case to a private ticket.<br /><br />You use normal voltage mode?</p> <p>DCDC or LDO?&nbsp;<br /><br />You are not able to program/flash the chip using the SWDIO interface?<br /><br />Best regards,<br />Kaja</p><div style="clear:both;"></div>