https://devzone.nordicsemi.com/f/nordic-q-a/81471/vi-o-vdd-3-6-vThe Absolute Maximum rating of I/O pin voltage for VI/O, VDD ≤3.6 V is -0.3V to VDD + 0.3V in Table 185. We would like to monitor the battery voltage using an AIN pin because we are planning to use a regulator for the board. During power-up/power-downen-USTelligent Community 13Thu, 11 Nov 2021 12:43:00 GMThttps://devzone.nordicsemi.com/thread/338568?ContentTypeID=1Thu, 11 Nov 2021 12:43:00 GMT137ad170-7792-4731-bb38-c0d22fbe4515:0bfa9175-a373-4140-aa41-3780ae490caahaakonsh<p><span>We have not characterized the device for operation outside the limits stated in production specification so we cannot guarantee performance for such cases. That said. after consulting design team we do not see any danger for circuit damage as long as voltage stays below 3.9 volt and the current is limited with a 200k Ohm resistor as suggested</span></p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/338000?ContentTypeID=1Mon, 08 Nov 2021 17:28:17 GMT137ad170-7792-4731-bb38-c0d22fbe4515:86ba18ff-bd75-4c97-9966-28c70b850c98Inderjit Bains<p>Maximum input voltage is 3.2V (lithium primary cell).</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/337936?ContentTypeID=1Mon, 08 Nov 2021 13:46:22 GMT137ad170-7792-4731-bb38-c0d22fbe4515:3e0c6730-4c85-478f-871c-3811bb4fc0cfhaakonsh[quote user=""]Is there a current limit for AIN pins that will prevent damage?[/quote] <p>No.</p> <p>What is your maximum input voltage?&nbsp;</p><div style="clear:both;"></div>