https://devzone.nordicsemi.com/f/nordic-q-a/74358/nrf52840-vdd-and-vddhOn my own board ,I just connect VDD and VDDH pin don&#39;t connect anything, Now my board can not use ble fuction,if I can confirm it&#39;s not the software issue, so is it possible the problem of VDDH pin ? thanksen-USTelligent Community 13Mon, 26 Apr 2021 07:21:41 GMThttps://devzone.nordicsemi.com/thread/306689?ContentTypeID=1Mon, 26 Apr 2021 07:21:41 GMT137ad170-7792-4731-bb38-c0d22fbe4515:abb16f71-8a1a-4369-b656-351a27820eacJared<p>Hi,</p> <p><a href="https://infocenter.nordicsemi.com/topic/ps_nrf52840/power.html?cp=4_0_0_4_2_0_3#unique_1186083872">VDD and VDDH should be tied together in Normal mode</a>. You need to follow the reference design more closely.</p> <p>regards</p> <p>Jared&nbsp;</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/306664?ContentTypeID=1Mon, 26 Apr 2021 01:32:11 GMT137ad170-7792-4731-bb38-c0d22fbe4515:3f552f8a-b0fb-43e7-ad3a-e73b2f17f5c0xiang san <p><a href="https://devzone.nordicsemi.com/cfs-file/__key/communityserver-discussions-components-files/4/feeder_5F00_52840_5F00_v1.1.2.pdf">devzone.nordicsemi.com/.../feeder_5F00_52840_5F00_v1.1.2.pdf</a></p> <p>this is my schematic ,can you find something wrong ?</p> <p>thanks</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/306559?ContentTypeID=1Fri, 23 Apr 2021 13:39:37 GMT137ad170-7792-4731-bb38-c0d22fbe4515:ea72ee77-d0e3-46eb-b59c-d6d32d098dfaJared<p>Hi,</p> <p>I&#39;m not sure I understand 100%. It would be much better if you shared the schematic for your design!</p> <p>regards</p> <p>Jared&nbsp;</p><div style="clear:both;"></div>