https://devzone.nordicsemi.com/f/nordic-q-a/76402/wlcsp-light-sensitivity-what-impact-to-npm1100There are discussions on WLCSP light sensitivity for nRF5 product, which affects RF, clock accuracy, and low power current draw etc. what about the nPM1100 which clock accuracy won&#39;t apply to nPM, would it just affect/increase the base current draw? en-USTelligent Community 13Wed, 16 Jun 2021 11:47:59 GMThttps://devzone.nordicsemi.com/thread/315585?ContentTypeID=1Wed, 16 Jun 2021 11:47:59 GMT137ad170-7792-4731-bb38-c0d22fbe4515:46c01430-b09f-4500-8b60-8a9ec2786286ketiljo<p>Hi Leo</p> <p>The nRF51 series was affected by IR light because the PLL was running in open loop when the radio was transmitting. IR light will cause a higher than normal drift of the carrier.&nbsp;</p> <p>The nRF52 series are little affected. Under very string IR light, you can probably observe some effect since the currents are very low. I can&#39;t imagine that the nPM1100 is affected by this as the currents here are much higher. Maybe ask PMT if they have given this any thought.</p> <p></p> <p>cheers,</p> <p>Ketil</p><div style="clear:both;"></div>