https://devzone.nordicsemi.com/f/nordic-q-a/121776/what-is-the-cr2032-power-supply-logic-on-the-nrf52dkThis is the power supply system in the nrf52832 development board. The manual means that when 1 and 2 are not powered, 3 is used for power supply, that is, cr2032 is used for power supply. -----------------------------------------------------------en-USTelligent Community 13Mon, 26 May 2025 11:00:46 GMThttps://devzone.nordicsemi.com/thread/536909?ContentTypeID=1Mon, 26 May 2025 11:00:46 GMT137ad170-7792-4731-bb38-c0d22fbe4515:3fb1647b-e5c6-4250-8241-b6c38afe698bAnwar51<p>Thanks for the very clear explanation, the device schematic is so important, and the circuit design is so wonderful！</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/536857?ContentTypeID=1Mon, 26 May 2025 05:20:01 GMT137ad170-7792-4731-bb38-c0d22fbe4515:456ef81b-e884-43b5-a5c5-7723381a2d54Turbo J<p>Take that as an example on what you <strong>don&#39;t</strong> want to do.</p> <p>The key bit of information here is that V_in and V_out are reversed, and the datasheet of the TCK106AG clearly shows the diode between these pins.</p> <p>Technically its not allowed by the datasheet to have voltage V_out bigger than V_in, but here this is how the circuit turns on when inserting the battery. The diode starts conducting, raising V_supply until the logic turns the power switch on (which eliminates the diode drop).</p> <p>That one relies on the fact that a CR2032 has a rather low short circuit current capability, otherwise it could blow the diode (which characteristics are not specified in the datasheet as far as I can tell).</p><div style="clear:both;"></div>