https://community.nxp.com/t5/Model-Based-Design-Toolbox-MBDT/Mutiple-ADCs-data-reading-flucating-badly/m-p/1900350#M9286 <P>Hello NXP Community,</P><P>I am working with an S32K344-based custom PCB and experiencing some issues with ADC readings. I have configured three ADC channels<STRONG> (ADC1(ADC0_P4), ADC2(ADC0_P3), and ADC3(ADC0_P0))</STRONG> under <STRONG>ADC0Group1</STRONG>. For testing purposes, all three channels are connected to the same voltage source. I intended to compare the consistency of the readings across multiple ADC channels.</P><P>However, I am encountering an issue where only ADC1 provides stable data readings, while ADC2 and ADC3 show significant fluctuations despite being configured identically and sampling the same voltage source. I have attached relevant screenshots from FreeMASTER showing the fluctuating readings and my Simulink configuration showing the setup.</P><P>I also tried adding more channels to ADC0Group1. Every ADC after ADC1 fluctuates a lot.</P><P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="noobsplzwin_1-1720202669455.png" style="width: 400px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/287320iEB309E781CFA5A1C/image-size/medium?v=v2&amp;px=400" role="button" title="noobsplzwin_1-1720202669455.png" alt="noobsplzwin_1-1720202669455.png" /></span></P><P>&nbsp;</P><P>Attachments:</P><OL><LI>FreeMASTER output showing the readings</LI><LI>S32CT configuration of the ADC setup</LI><LI>Simulink File</LI></OL><P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="noobsplzwin_2-1720202785247.png" style="width: 400px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/287321iEA1ECAB3C71A9000/image-size/medium?v=v2&amp;px=400" role="button" title="noobsplzwin_2-1720202785247.png" alt="noobsplzwin_2-1720202785247.png" /></span></P><P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="noobsplzwin_3-1720202801583.png" style="width: 400px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/287322i118088DA21A5145C/image-size/medium?v=v2&amp;px=400" role="button" title="noobsplzwin_3-1720202801583.png" alt="noobsplzwin_3-1720202801583.png" /></span><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="noobsplzwin_4-1720202813819.png" style="width: 400px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/287323i13903C20FA398BDB/image-size/medium?v=v2&amp;px=400" role="button" title="noobsplzwin_4-1720202813819.png" alt="noobsplzwin_4-1720202813819.png" /></span></P><P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="noobsplzwin_5-1720202823842.png" style="width: 400px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/287324i7EE7566610A4C582/image-size/medium?v=v2&amp;px=400" role="button" title="noobsplzwin_5-1720202823842.png" alt="noobsplzwin_5-1720202823842.png" /></span></P><P><BR />I am wondering if there is something I am missing in the configuration or if there might be a known issue with such a setup. Any advice or suggestions would be greatly appreciated!</P><P>Thank you!<BR />Connor</P> Fri, 05 Jul 2024 18:13:44 GMT noobsplzwin 2024-07-05T18:13:44Z https://community.nxp.com/t5/Model-Based-Design-Toolbox-MBDT/Mutiple-ADCs-data-reading-flucating-badly/m-p/1900350#M9286 <P>Hello NXP Community,</P><P>I am working with an S32K344-based custom PCB and experiencing some issues with ADC readings. I have configured three ADC channels<STRONG> (ADC1(ADC0_P4), ADC2(ADC0_P3), and ADC3(ADC0_P0))</STRONG> under <STRONG>ADC0Group1</STRONG>. For testing purposes, all three channels are connected to the same voltage source. I intended to compare the consistency of the readings across multiple ADC channels.</P><P>However, I am encountering an issue where only ADC1 provides stable data readings, while ADC2 and ADC3 show significant fluctuations despite being configured identically and sampling the same voltage source. I have attached relevant screenshots from FreeMASTER showing the fluctuating readings and my Simulink configuration showing the setup.</P><P>I also tried adding more channels to ADC0Group1. Every ADC after ADC1 fluctuates a lot.</P><P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="noobsplzwin_1-1720202669455.png" style="width: 400px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/287320iEB309E781CFA5A1C/image-size/medium?v=v2&amp;px=400" role="button" title="noobsplzwin_1-1720202669455.png" alt="noobsplzwin_1-1720202669455.png" /></span></P><P>&nbsp;</P><P>Attachments:</P><OL><LI>FreeMASTER output showing the readings</LI><LI>S32CT configuration of the ADC setup</LI><LI>Simulink File</LI></OL><P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="noobsplzwin_2-1720202785247.png" style="width: 400px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/287321iEA1ECAB3C71A9000/image-size/medium?v=v2&amp;px=400" role="button" title="noobsplzwin_2-1720202785247.png" alt="noobsplzwin_2-1720202785247.png" /></span></P><P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="noobsplzwin_3-1720202801583.png" style="width: 400px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/287322i118088DA21A5145C/image-size/medium?v=v2&amp;px=400" role="button" title="noobsplzwin_3-1720202801583.png" alt="noobsplzwin_3-1720202801583.png" /></span><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="noobsplzwin_4-1720202813819.png" style="width: 400px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/287323i13903C20FA398BDB/image-size/medium?v=v2&amp;px=400" role="button" title="noobsplzwin_4-1720202813819.png" alt="noobsplzwin_4-1720202813819.png" /></span></P><P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="noobsplzwin_5-1720202823842.png" style="width: 400px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/287324i7EE7566610A4C582/image-size/medium?v=v2&amp;px=400" role="button" title="noobsplzwin_5-1720202823842.png" alt="noobsplzwin_5-1720202823842.png" /></span></P><P><BR />I am wondering if there is something I am missing in the configuration or if there might be a known issue with such a setup. Any advice or suggestions would be greatly appreciated!</P><P>Thank you!<BR />Connor</P> Fri, 05 Jul 2024 18:13:44 GMT https://community.nxp.com/t5/Model-Based-Design-Toolbox-MBDT/Mutiple-ADCs-data-reading-flucating-badly/m-p/1900350#M9286 noobsplzwin 2024-07-05T18:13:44Z