https://devzone.nordicsemi.com/f/nordic-q-a/24782/high-drive-on-nrf51822-not-workingI am using the nrf51822 with a latching circuit as shown controlled by P0.05 pin. I am using the following code SDK 10.0 S110 softdevice to Power ON the circuit (PowerPin P0.05. #define powerPin 5 NRF_GPIO-&gt;PIN_CNF[powerPin] = (GPIO_PIN_CNF_DRIVE_H0D1en-USTelligent Community 13Fri, 01 Sep 2017 11:48:36 GMThttps://devzone.nordicsemi.com/thread/97574?ContentTypeID=1Fri, 01 Sep 2017 11:48:36 GMT137ad170-7792-4731-bb38-c0d22fbe4515:8a891319-7259-4681-abea-915869a764f2Turbo J<p>The pin mode</p> <pre><code>GPIO_PIN_CNF_DRIVE_H0D1 </code></pre> <p>is the &quot;open collector&quot; high drive, that means the pin can switch from high current capable zero (0) to high impedance (D == disconnect).</p> <p>You probably wanted to use</p> <pre><code>GPIO_PIN_CNF_DRIVE_H0H1 </code></pre> <p>as your pin mode, as this will actually drive the pin when it is set high.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/97573?ContentTypeID=1Fri, 01 Sep 2017 10:04:57 GMT137ad170-7792-4731-bb38-c0d22fbe4515:d30cffd9-4643-4f46-a84e-806e556c82a5brinder<p>3.3V at VBAT</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/97572?ContentTypeID=1Thu, 31 Aug 2017 13:55:10 GMT137ad170-7792-4731-bb38-c0d22fbe4515:210b5c43-96fe-4140-8ff8-7d9802307a08J&#248;rn<p>What is the voltage level of VBAT in your schematic?</p><div style="clear:both;"></div>