topic S32K344 ADC in S32K https://community.nxp.com/t5/S32K/S32K344-ADC/m-p/2110821#M49600 <P>S32K344芯片，时钟配置是《 <SPAN class="">Table 151. Option A - High Performance mode (CORE_CLK @ 160 MHz)</SPAN>》，ADC的参考电压是5V，配置如下：</P><P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="WeiCh_0-1749090717085.png" style="width: 400px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/341460iED3E971724694864/image-size/medium?v=v2&amp;px=400" role="button" title="WeiCh_0-1749090717085.png" alt="WeiCh_0-1749090717085.png" /></span><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="WeiCh_1-1749090732205.png" style="width: 400px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/341461i29414BB51A387344/image-size/medium?v=v2&amp;px=400" role="button" title="WeiCh_1-1749090732205.png" alt="WeiCh_1-1749090732205.png" /></span></P><P>当采样点在4V以上时，误差有40mV；</P><P>当采样点在1V时，误差有10mV；</P><P>有什么方法能增加采样时间或者提高精度吗？</P><P>&nbsp;</P> Thu, 05 Jun 2025 02:38:03 GMT WeiCh 2025-06-05T02:38:03Z S32K344 ADC https://community.nxp.com/t5/S32K/S32K344-ADC/m-p/2110821#M49600 <P>S32K344芯片，时钟配置是《 <SPAN class="">Table 151. Option A - High Performance mode (CORE_CLK @ 160 MHz)</SPAN>》，ADC的参考电压是5V，配置如下：</P><P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="WeiCh_0-1749090717085.png" style="width: 400px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/341460iED3E971724694864/image-size/medium?v=v2&amp;px=400" role="button" title="WeiCh_0-1749090717085.png" alt="WeiCh_0-1749090717085.png" /></span><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="WeiCh_1-1749090732205.png" style="width: 400px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/341461i29414BB51A387344/image-size/medium?v=v2&amp;px=400" role="button" title="WeiCh_1-1749090732205.png" alt="WeiCh_1-1749090732205.png" /></span></P><P>当采样点在4V以上时，误差有40mV；</P><P>当采样点在1V时，误差有10mV；</P><P>有什么方法能增加采样时间或者提高精度吗？</P><P>&nbsp;</P> Thu, 05 Jun 2025 02:38:03 GMT https://community.nxp.com/t5/S32K/S32K344-ADC/m-p/2110821#M49600 WeiCh 2025-06-05T02:38:03Z Re: S32K344 ADC https://community.nxp.com/t5/S32K/S32K344-ADC/m-p/2111142#M49612 <P>Hi@<SPAN>WeiCh</SPAN></P> <P>关于采样时间，ADC模块时钟分频还可以设置，其它的和采样时间相关的参数我看你已经设置到最大了，没有其它可设置的地方了。</P> <P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="2025-06-05_16-28-58.png" style="width: 999px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/341579i0AAFBFBF12A55E89/image-size/large?v=v2&amp;px=999" role="button" title="2025-06-05_16-28-58.png" alt="2025-06-05_16-28-58.png" /></span></P> <DIV id="tinyMceEditorSenlent_4" class="mceNonEditable lia-copypaste-placeholder">&nbsp;</DIV> Thu, 05 Jun 2025 08:36:33 GMT https://community.nxp.com/t5/S32K/S32K344-ADC/m-p/2111142#M49612 Senlent 2025-06-05T08:36:33Z Re: S32K344 ADC https://community.nxp.com/t5/S32K/S32K344-ADC/m-p/2111168#M49614 <P>上面的配置是我按照手册配置的，DIV都改成4的结果和前者差别很小，结果平均有1%的误差，是不是和采样时间配置关系不大？使能和不使能High Speed的差别也很小。</P> Thu, 05 Jun 2025 08:55:54 GMT https://community.nxp.com/t5/S32K/S32K344-ADC/m-p/2111168#M49614 WeiCh 2025-06-05T08:55:54Z Re: S32K344 ADC https://community.nxp.com/t5/S32K/S32K344-ADC/m-p/2111202#M49617 <P>Hi@<SPAN>WeiCh</SPAN></P> <P>软件上能改的就这么多，采样时间，自检都做了，如果误差还是大，可以考虑下硬件方面，ADC参考电压是否有波动，采样电路的设计等。还有你如何测量误差的，你怎么得出40mv的误差的，这个误差是否有可能是测量引起的呢。</P> Thu, 05 Jun 2025 09:23:51 GMT https://community.nxp.com/t5/S32K/S32K344-ADC/m-p/2111202#M49617 Senlent 2025-06-05T09:23:51Z