https://devzone.nordicsemi.com/f/nordic-q-a/55888/vdd-vddh-dcch-power-configurationVDD&amp; VDDH&amp; DCCH Is the connection correct? What should be paid attention to when designing the power supply?en-USTelligent Community 13Mon, 23 Dec 2019 13:23:37 GMThttps://devzone.nordicsemi.com/thread/226729?ContentTypeID=1Mon, 23 Dec 2019 13:23:37 GMT137ad170-7792-4731-bb38-c0d22fbe4515:a5dae75b-b8b3-4d7f-9e53-2927a85fdebcJared<p>Hi,</p> <p>The nRF will be in normal mode if you connect VDDH and VDD to the same node, which means that the first regulator stage won&#39;t be used which makes DCCH unnecessary. Please see the documentation regarding <a href="https://infocenter.nordicsemi.com/topic/ps_nrf52840/power.html?cp=4_0_0_4_2">power supply</a> and <a href="https://infocenter.nordicsemi.com/topic/ps_nrf52840/power.html?cp=4_0_0_4_2">reference design</a> for more information.</p> <p>regards</p> <p>Jared&nbsp;</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/226696?ContentTypeID=1Mon, 23 Dec 2019 03:15:35 GMT137ad170-7792-4731-bb38-c0d22fbe4515:403894db-f36b-48e8-bbb9-c28eec9a0fdemash273<p>Hello,&nbsp;<img alt="Schematic 4" src="https://devzone.nordicsemi.com/resized-image/__size/320x240/__key/communityserver-discussions-components-files/4/nrf52840_5F00_qiaa_5F00_var4_5F00_schematic.png" /></p> <table class="table" style="border:medium none currentColor;border-collapse:separate;box-shadow:0px 1px 2px #d1d1d1;color:#474747;font-family:Calibri,Arial,Sans-Serif;font-size:16px;font-style:normal;font-weight:400;letter-spacing:normal;margin-bottom:30px;margin-left:auto;margin-right:auto;text-align:left;text-decoration:none;text-indent:0px;text-transform:none;white-space:normal;" id="unique_1073517861__table_gfv_jqb_by" border="0" cellpadding="4" cellspacing="0" frame="void" rules="none" summary=""> <thead class="thead" style="text-align:left;"> <tr class="row" style="text-align:left;"> <th class="entry nocellnorowborder" style="background-attachment:scroll;background-color:transparent;background-repeat:repeat;background-size:auto;border-color:currentColor;border-style:none hidden hidden none;border-width:medium;color:#000000;font-size:18px;font-weight:bold;padding:10px 15px 10px 10px;text-align:left;vertical-align:top;" id="d1295325e1894" colspan="1" rowspan="2">Config no.</th> <th class="entry nocellnorowborder" style="background-attachment:scroll;background-color:transparent;background-repeat:repeat;background-size:auto;border-color:currentColor;border-style:none hidden hidden none;border-width:medium;color:#000000;font-size:18px;font-weight:bold;padding:10px 15px 10px 10px;text-align:left;vertical-align:top;" id="d1295325e1897" colspan="2" rowspan="1">Supply configuration</th> <th class="entry nocellnorowborder" style="background-attachment:scroll;background-color:transparent;background-repeat:repeat;background-size:auto;border-color:currentColor;border-style:none hidden hidden none;border-width:medium;color:#000000;font-size:18px;font-weight:bold;padding:10px 15px 10px 10px;text-align:left;vertical-align:top;" id="d1295325e1900" colspan="5" rowspan="1">Enabled features</th> </tr> <tr class="row" style="text-align:left;"> <th class="entry nocellnorowborder" style="background-attachment:scroll;background-color:transparent;background-repeat:repeat;background-size:auto;border-color:currentColor;border-style:none hidden hidden none;border-width:medium;color:#000000;font-size:18px;font-weight:bold;padding:10px 15px 10px 10px;text-align:left;vertical-align:top;" id="d1295325e1906" colspan="1" rowspan="1">VDDH</th> <th class="entry nocellnorowborder" style="background-attachment:scroll;background-color:transparent;background-repeat:repeat;background-size:auto;border-color:currentColor;border-style:none hidden hidden none;border-width:medium;color:#000000;font-size:18px;font-weight:bold;padding:10px 15px 10px 10px;text-align:left;vertical-align:top;" id="d1295325e1909" colspan="1" rowspan="1">VDD</th> <th class="entry nocellnorowborder" style="background-attachment:scroll;background-color:transparent;background-repeat:repeat;background-size:auto;border-color:currentColor;border-style:none hidden hidden none;border-width:medium;color:#000000;font-size:18px;font-weight:bold;padding:10px 15px 10px 10px;text-align:left;vertical-align:top;" id="d1295325e1912" colspan="1" rowspan="1">EXTSUPPLY</th> <th class="entry nocellnorowborder" style="background-attachment:scroll;background-color:transparent;background-repeat:repeat;background-size:auto;border-color:currentColor;border-style:none hidden hidden none;border-width:medium;color:#000000;font-size:18px;font-weight:bold;padding:10px 15px 10px 10px;text-align:left;vertical-align:top;" id="d1295325e1915" colspan="1" rowspan="1">DCDCEN0</th> <th class="entry nocellnorowborder" style="background-attachment:scroll;background-color:transparent;background-repeat:repeat;background-size:auto;border-color:currentColor;border-style:none hidden hidden none;border-width:medium;color:#000000;font-size:18px;font-weight:bold;padding:10px 15px 10px 10px;text-align:left;vertical-align:top;" id="d1295325e1918" colspan="1" rowspan="1">DCDCEN1</th> <th class="entry nocellnorowborder" style="background-attachment:scroll;background-color:transparent;background-repeat:repeat;background-size:auto;border-color:currentColor;border-style:none hidden hidden none;border-width:medium;color:#000000;font-size:18px;font-weight:bold;padding:10px 15px 10px 10px;text-align:left;vertical-align:top;" id="d1295325e1922" colspan="1" rowspan="1">USB</th> <th class="entry nocellnorowborder" style="background-attachment:scroll;background-color:transparent;background-repeat:repeat;background-size:auto;border-color:currentColor;border-style:none hidden hidden none;border-width:medium;color:#000000;font-size:18px;font-weight:bold;padding:10px 15px 10px 10px;text-align:left;vertical-align:top;" id="d1295325e1925" colspan="1" rowspan="1">NFC</th> </tr> </thead> <tbody class="tbody"> <tr class="row" style="text-align:left;"> <td class="entry nocellnorowborder" style="border-color:currentColor;border-style:none hidden hidden none;border-width:medium;padding:5px 5px 5px 10px;text-align:left;vertical-align:top;" colspan="1" headers="d1295325e1894 d1295325e1906" rowspan="1">Config. 4</td> <td class="entry nocellnorowborder" style="border-color:currentColor;border-style:none hidden hidden none;border-width:medium;padding:5px 5px 5px 10px;text-align:left;vertical-align:top;" colspan="1" headers="d1295325e1897 d1295325e1909" rowspan="1"><strong>Battery/Ext. regulator</strong></td> <td class="entry nocellnorowborder" style="border-color:currentColor;border-style:none hidden hidden none;border-width:medium;padding:5px 5px 5px 10px;text-align:left;vertical-align:top;" colspan="1" headers="d1295325e1897 d1295325e1912" rowspan="1">N/A</td> <td class="entry nocellnorowborder" style="border-color:currentColor;border-style:none hidden hidden none;border-width:medium;padding:5px 5px 5px 10px;text-align:left;vertical-align:top;" colspan="1" headers="d1295325e1900 d1295325e1915" rowspan="1">Yes</td> <td class="entry nocellnorowborder" style="border-color:currentColor;border-style:none hidden hidden none;border-width:medium;padding:5px 5px 5px 10px;text-align:left;vertical-align:top;" colspan="1" headers="d1295325e1900 d1295325e1918" rowspan="1">Yes</td> <td class="entry nocellnorowborder" style="border-color:currentColor;border-style:none hidden hidden none;border-width:medium;padding:5px 5px 5px 10px;text-align:left;vertical-align:top;" colspan="1" headers="d1295325e1900 d1295325e1922" rowspan="1">Yes</td> <td class="entry nocellnorowborder" style="border-color:currentColor;border-style:none hidden hidden none;border-width:medium;padding:5px 5px 5px 10px;text-align:left;vertical-align:top;" colspan="1" headers="d1295325e1900 d1295325e1925" rowspan="1">Yes</td> <td class="entry nocellnorowborder" style="border-color:currentColor;border-style:none hidden hidden none;border-width:medium;padding:5px 5px 5px 10px;text-align:left;vertical-align:top;" colspan="1" headers="d1295325e1900" rowspan="1">No</td> </tr> </tbody> </table> <p><span style="background-color:#ffffff;color:#000000;float:none;font-family:Verdana,Arial,Helvetica,sans-serif;font-size:12px;font-style:normal;font-weight:400;letter-spacing:normal;text-align:left;text-decoration:none;text-indent:0px;text-transform:none;white-space:normal;">Hello, in config 4 is listen the schematic is for use in Battery / Ext. regulator and USB is YES.</span></p> <p><span style="background-color:#ffffff;color:#000000;float:none;font-family:Verdana,Arial,Helvetica,sans-serif;font-size:12px;font-style:normal;font-weight:400;letter-spacing:normal;text-align:left;text-decoration:none;text-indent:0px;text-transform:none;white-space:normal;">Can I use USB and Battery at the same time? Normaly i have to use a diode.</span></p> <p>When i use USB Only with DCDCEN = 0, It still have 1,8 V on VDD_NRF.</p> <p>So, do i use a Diode or can i power off the 1,8V with Software?</p> <p>I think it is not good to have a charge effect on normal batterys.</p><div style="clear:both;"></div>