https://community.nxp.com/t5/i-MX-Processors/Can-RTC-XTALI-connect-to-RTC-SQW/m-p/2252653#M242549 <P>The BLOCK diagram is as follows:<BR /><BR /><U><STRONG>Phenomenon:</STRONG></U></P><P>After powering on, the 3.3V voltage drops to 3.0V. When the connection between RTC_XTALI and SQW is disconnected, the voltage returns to 3.3V.<BR /><U><STRONG>Issue: </STRONG></U></P><P>Can the SQW of the RTC chip be connected directly to the CPU's RTC_XTALI interface?</P><P><STRONG><U><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="BLOCK.png" style="width: 678px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/368100iCC6B52BB8F4D4079/image-dimensions/678x524?v=v2" width="678" height="524" role="button" title="BLOCK.png" alt="BLOCK.png" /></span></U></STRONG></P><P>&nbsp;</P> Tue, 02 Dec 2025 02:24:20 GMT WSLJ 2025-12-02T02:24:20Z https://community.nxp.com/t5/i-MX-Processors/Can-RTC-XTALI-connect-to-RTC-SQW/m-p/2252653#M242549 <P>The BLOCK diagram is as follows:<BR /><BR /><U><STRONG>Phenomenon:</STRONG></U></P><P>After powering on, the 3.3V voltage drops to 3.0V. When the connection between RTC_XTALI and SQW is disconnected, the voltage returns to 3.3V.<BR /><U><STRONG>Issue: </STRONG></U></P><P>Can the SQW of the RTC chip be connected directly to the CPU's RTC_XTALI interface?</P><P><STRONG><U><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="BLOCK.png" style="width: 678px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/368100iCC6B52BB8F4D4079/image-dimensions/678x524?v=v2" width="678" height="524" role="button" title="BLOCK.png" alt="BLOCK.png" /></span></U></STRONG></P><P>&nbsp;</P> Tue, 02 Dec 2025 02:24:20 GMT https://community.nxp.com/t5/i-MX-Processors/Can-RTC-XTALI-connect-to-RTC-SQW/m-p/2252653#M242549 WSLJ 2025-12-02T02:24:20Z https://community.nxp.com/t5/i-MX-Processors/Can-RTC-XTALI-connect-to-RTC-SQW/m-p/2264574#M242942 <P>Here you can not connect the RTC SQW to the&nbsp;RTC_XTALI , for the RTC_XTALI is the&nbsp;analog clock input.</P> <P>CKIL (Clock Input Low) is a dedicated pin used to receive external 32.768 kHz digital clock signals, so you need to connect the RTC SQW to the&nbsp;CKIL on the i.MX6Q side.&nbsp; You need to follow the circuilt recommend.</P> <P>Any questions contact us freely.</P> <P>&nbsp;</P> Wed, 17 Dec 2025 08:42:05 GMT https://community.nxp.com/t5/i-MX-Processors/Can-RTC-XTALI-connect-to-RTC-SQW/m-p/2264574#M242942 Rita_Wang 2025-12-17T08:42:05Z