https://community.nxp.com/t5/Power-Management/imx8mp-amp-pca9450c-program-cannot-start/m-p/2266522#M4894 <P><a href="https://community.nxp.com/t5/user/viewprofilepage/user-id/138749">@guoweisun</a>&nbsp;, 感谢回复</P><P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="hjk003_0-1766124046856.png" style="width: 400px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/370699i31C42D73761AE152/image-size/medium?v=v2&amp;px=400" role="button" title="hjk003_0-1766124046856.png" alt="hjk003_0-1766124046856.png" /></span><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="hjk003_1-1766124109008.png" style="width: 400px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/370700i5F0299B4105DA561/image-size/medium?v=v2&amp;px=400" role="button" title="hjk003_1-1766124109008.png" alt="hjk003_1-1766124109008.png" /></span><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="hjk003_2-1766124208738.png" style="width: 400px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/370701i77532509EB6461E8/image-size/medium?v=v2&amp;px=400" role="button" title="hjk003_2-1766124208738.png" alt="hjk003_2-1766124208738.png" /></span><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="hjk003_3-1766124312322.png" style="width: 400px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/370702i8103B259B74515FB/image-size/medium?v=v2&amp;px=400" role="button" title="hjk003_3-1766124312322.png" alt="hjk003_3-1766124312322.png" /></span></P><P>&nbsp;</P> Fri, 19 Dec 2025 06:05:58 GMT hjk003 2025-12-19T06:05:58Z https://community.nxp.com/t5/Power-Management/imx8mp-amp-pca9450c-program-cannot-start/m-p/2266503#M4892 <P>When the board was initially powered on, all output voltages of the PCA9450 were normal. After downloading a program using SDPS mode on an M8P board without any program loaded, all power supplies to the PCA9450C except for LDO1 and LDO2 lost power.</P><P>Using an oscilloscope to observe the PCA9450C startup, it was found that all power supply voltages, except for LDO1 and LDO2, exhibited pulses with 100ms intervals. These pulses lasted for several cycles before the power supply returned to normal.</P><P>Below are the logs after downloading the program and the oscilloscope voltage readings.</P><P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="hjk003_0-1766122256898.png" style="width: 400px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/370695i29D1C45A808258D1/image-size/medium?v=v2&amp;px=400" role="button" title="hjk003_0-1766122256898.png" alt="hjk003_0-1766122256898.png" /></span></P><P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="hjk003_1-1766122321365.png" style="width: 400px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/370696iBFABED6F45B1AFAB/image-size/medium?v=v2&amp;px=400" role="button" title="hjk003_1-1766122321365.png" alt="hjk003_1-1766122321365.png" /></span></P><P>&nbsp;</P> Fri, 19 Dec 2025 05:34:00 GMT https://community.nxp.com/t5/Power-Management/imx8mp-amp-pca9450c-program-cannot-start/m-p/2266503#M4892 hjk003 2025-12-19T05:34:00Z https://community.nxp.com/t5/Power-Management/imx8mp-amp-pca9450c-program-cannot-start/m-p/2266512#M4893 <P>这里只看PCA9450的异常，测试VIN/BUCK1/POWER _ON_REQUEST的波形</P> Fri, 19 Dec 2025 05:57:52 GMT https://community.nxp.com/t5/Power-Management/imx8mp-amp-pca9450c-program-cannot-start/m-p/2266512#M4893 guoweisun 2025-12-19T05:57:52Z https://community.nxp.com/t5/Power-Management/imx8mp-amp-pca9450c-program-cannot-start/m-p/2266522#M4894 <P><a href="https://community.nxp.com/t5/user/viewprofilepage/user-id/138749">@guoweisun</a>&nbsp;, 感谢回复</P><P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="hjk003_0-1766124046856.png" style="width: 400px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/370699i31C42D73761AE152/image-size/medium?v=v2&amp;px=400" role="button" title="hjk003_0-1766124046856.png" alt="hjk003_0-1766124046856.png" /></span><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="hjk003_1-1766124109008.png" style="width: 400px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/370700i5F0299B4105DA561/image-size/medium?v=v2&amp;px=400" role="button" title="hjk003_1-1766124109008.png" alt="hjk003_1-1766124109008.png" /></span><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="hjk003_2-1766124208738.png" style="width: 400px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/370701i77532509EB6461E8/image-size/medium?v=v2&amp;px=400" role="button" title="hjk003_2-1766124208738.png" alt="hjk003_2-1766124208738.png" /></span><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="hjk003_3-1766124312322.png" style="width: 400px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/370702i8103B259B74515FB/image-size/medium?v=v2&amp;px=400" role="button" title="hjk003_3-1766124312322.png" alt="hjk003_3-1766124312322.png" /></span></P><P>&nbsp;</P> Fri, 19 Dec 2025 06:05:58 GMT https://community.nxp.com/t5/Power-Management/imx8mp-amp-pca9450c-program-cannot-start/m-p/2266522#M4894 hjk003 2025-12-19T06:05:58Z https://community.nxp.com/t5/Power-Management/imx8mp-amp-pca9450c-program-cannot-start/m-p/2266524#M4895 <P>打我的电话147</P> Fri, 19 Dec 2025 06:36:22 GMT https://community.nxp.com/t5/Power-Management/imx8mp-amp-pca9450c-program-cannot-start/m-p/2266524#M4895 guoweisun 2025-12-19T06:36:22Z https://community.nxp.com/t5/Power-Management/imx8mp-amp-pca9450c-program-cannot-start/m-p/2266544#M4897 <P><a href="https://community.nxp.com/t5/user/viewprofilepage/user-id/138749">@guoweisun</a>&nbsp;,</P><P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="hjk003_0-1766125486827.png" style="width: 400px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/370713iD270770A2EC2A2D0/image-size/medium?v=v2&amp;px=400" role="button" title="hjk003_0-1766125486827.png" alt="hjk003_0-1766125486827.png" /></span><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="hjk003_1-1766125501858.png" style="width: 400px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/370714i7F01383985A81870/image-size/medium?v=v2&amp;px=400" role="button" title="hjk003_1-1766125501858.png" alt="hjk003_1-1766125501858.png" /></span></P><P>&nbsp;</P> Fri, 19 Dec 2025 06:26:07 GMT https://community.nxp.com/t5/Power-Management/imx8mp-amp-pca9450c-program-cannot-start/m-p/2266544#M4897 hjk003 2025-12-19T06:26:07Z https://community.nxp.com/t5/Power-Management/imx8mp-amp-pca9450c-program-cannot-start/m-p/2266547#M4898 <P><a href="https://community.nxp.com/t5/user/viewprofilepage/user-id/138749">@guoweisun</a>&nbsp;,</P><P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="hjk003_0-1766125728129.png" style="width: 400px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/370715i450903C63EF1822C/image-size/medium?v=v2&amp;px=400" role="button" title="hjk003_0-1766125728129.png" alt="hjk003_0-1766125728129.png" /></span></P><P>&nbsp;</P> Fri, 19 Dec 2025 06:29:31 GMT https://community.nxp.com/t5/Power-Management/imx8mp-amp-pca9450c-program-cannot-start/m-p/2266547#M4898 hjk003 2025-12-19T06:29:31Z https://community.nxp.com/t5/Power-Management/imx8mp-amp-pca9450c-program-cannot-start/m-p/2266549#M4899 <P>gu</P> Fri, 19 Dec 2025 06:36:06 GMT https://community.nxp.com/t5/Power-Management/imx8mp-amp-pca9450c-program-cannot-start/m-p/2266549#M4899 guoweisun 2025-12-19T06:36:06Z