https://devzone.nordicsemi.com/f/nordic-q-a/124400/nrf52840-current-consumption-on-boot-requires-less-than-1manRF52840 using Zephyr 2.0.0 We currently have a system that after we are running can drop to 20uA. However, on boot, we draw something like 5-7mA. This large on boot current draw is causing the nRF to enter brownout condition because we are runningen-USTelligent Community 13Thu, 18 Sep 2025 10:33:17 GMThttps://devzone.nordicsemi.com/thread/549150?ContentTypeID=1Thu, 18 Sep 2025 10:33:17 GMT137ad170-7792-4731-bb38-c0d22fbe4515:405528d3-0ed0-4163-aae8-cdd3941aa0a0Simonr<p>Hi Dominic</p> <p>What battery are you using in your design here? In general I agree with&nbsp;<a href="https://devzone.nordicsemi.com/members/turboj">Turbo J</a>&nbsp; to make sure your battery follows the recommended operating conditions from the datasheet.</p> <p>The device startup times can be found in the product specification in the table of Device startup times (p. 156 in the nRF52840 PS):</p> <p>&nbsp;<img style="max-height:240px;max-width:320px;" src="https://devzone.nordicsemi.com/resized-image/__size/640x480/__key/communityserver-discussions-components-files/4/2047.pastedimage1758191565484v1.png" alt=" " /></p> <p>Also, something like a capacitor or power management circuit to store the power from the battery to have more capacitance when starting the device might be an idea to implement to your design if you haven&#39;t already.</p> <p>Best regards,</p> <p>Simon</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/548886?ContentTypeID=1Tue, 16 Sep 2025 12:22:49 GMT137ad170-7792-4731-bb38-c0d22fbe4515:02a440aa-7e46-4c93-b67a-5f5a458c3920Turbo J<p>Forget it, use a bigger coin cell. CR2032 seems to work fine here.</p> <p>See chapter 8 in the PS, &quot;recommended operating condition&quot;. The supply voltage rise time has a maximum value.</p><div style="clear:both;"></div>