topic i.MX8 Mini RTC Battery Backup in i.MX Processors https://community.nxp.com/t5/i-MX-Processors/i-MX8-Mini-RTC-Battery-Backup/m-p/963869#M143642 <HTML><HEAD></HEAD><BODY><P>I just wanted to verify but looking at the datasheet for the i.MX8 Mini the RTC cannot be battery or supercap backed up, correct?&nbsp; If we want to use an RTC with battery backup we will need to add an external RTC in that case.</P></BODY></HTML> Tue, 09 Jul 2019 21:21:50 GMT shawnnageli 2019-07-09T21:21:50Z i.MX8 Mini RTC Battery Backup https://community.nxp.com/t5/i-MX-Processors/i-MX8-Mini-RTC-Battery-Backup/m-p/963869#M143642 <HTML><HEAD></HEAD><BODY><P>I just wanted to verify but looking at the datasheet for the i.MX8 Mini the RTC cannot be battery or supercap backed up, correct?&nbsp; If we want to use an RTC with battery backup we will need to add an external RTC in that case.</P></BODY></HTML> Tue, 09 Jul 2019 21:21:50 GMT https://community.nxp.com/t5/i-MX-Processors/i-MX8-Mini-RTC-Battery-Backup/m-p/963869#M143642 shawnnageli 2019-07-09T21:21:50Z Re: i.MX8 Mini RTC Battery Backup https://community.nxp.com/t5/i-MX-Processors/i-MX8-Mini-RTC-Battery-Backup/m-p/963870#M143643 <HTML><HEAD></HEAD><BODY><P>Hello <A _jive_internal="true" data-content-finding="Community" data-userid="280701" data-username="shawnnageli" href="https://community.nxp.com/people/shawnnageli">Shawn</A>,</P><P></P><P><STRONG>1. SRTC of i.MX8MM needs 2 voltages.</STRONG></P><P>One is 1.8V, the other is 0.8V.</P><P>See schematic of I.MX8MM EVK, please!</P><P><span class="lia-inline-image-display-wrapper" image-alt="pastedImage_2.png"><img src="https://community.nxp.com/t5/image/serverpage/image-id/90868iE347F1B2229463A7/image-size/large?v=v2&amp;px=999" role="button" title="pastedImage_2.png" alt="pastedImage_2.png" /></span></P><P><STRONG>2. PMIC(BD71847MWV) on i.MX8M MINI EVK board</STRONG></P><P><span class="lia-inline-image-display-wrapper" image-alt="pastedImage_3.png"><img src="https://community.nxp.com/t5/image/serverpage/image-id/90883iDCA741514CE342B7/image-size/large?v=v2&amp;px=999" role="button" title="pastedImage_3.png" alt="pastedImage_3.png" /></span></P><P>Because there is no PAD for LI Coin Cell input on the PMIC, i.MX8M MINI EVK board doesn't support Li battery back for SRTC.</P><P><STRONG>3. On RTC for application</STRONG></P><P>Two solutions are recommended for you on RTC:</P><P><STRONG>(1) Using RTC chip</STRONG></P><P>you can select one of RTC on the link for you application:</P><P><A class="link-titled" href="https://www.nxp.com/products/analog/interfaces/ic-bus/ic-real-time-clocks-rtc:MC_71250" title="https://www.nxp.com/products/analog/interfaces/ic-bus/ic-real-time-clocks-rtc:MC_71250">Analog I²C Real-Time Clocks (RTC) | NXP</A>&nbsp;</P><P><STRONG>(2) Using NXP PMIC(PF8100 or PF8121)</STRONG></P><P>LICELL input PAD is supported by the PMIC, PF8100 + I.MX8M MINI solution is provided by Boundary Device CO. LTD, see the link, please!</P><P><A class="link-titled" href="https://boundarydevices.com/no-access/download-id/35103/" title="https://boundarydevices.com/no-access/download-id/35103/">https://boundarydevices.com/no-access/download-id/35103/</A>&nbsp;</P><P>after registerring your account , probably you can get schematic like below:</P><P><span class="lia-inline-image-display-wrapper" image-alt="pastedImage_9.png"><img src="https://community.nxp.com/t5/image/serverpage/image-id/90884i6C17ED22E962B690/image-size/large?v=v2&amp;px=999" role="button" title="pastedImage_9.png" alt="pastedImage_9.png" /></span></P><P></P><P></P><P>Hope above information is helpful for you!</P><P>BR,</P><P>Weidong</P></BODY></HTML> Wed, 10 Jul 2019 09:28:38 GMT https://community.nxp.com/t5/i-MX-Processors/i-MX8-Mini-RTC-Battery-Backup/m-p/963870#M143643 weidong_sun 2019-07-10T09:28:38Z