topic Re: How to Current Measurement Calibrate in S12 / MagniV Microcontrollers https://community.nxp.com/t5/S12-MagniV-Microcontrollers/How-to-Current-Measurement-Calibrate/m-p/729038#M14883 <HTML><HEAD></HEAD><BODY><P>I am using mm9z1j638 need temperature and current calibration procedure for this controller</P></BODY></HTML> Wed, 20 Dec 2017 07:50:41 GMT embeddedenginee 2017-12-20T07:50:41Z How to Current Measurement Calibrate https://community.nxp.com/t5/S12-MagniV-Microcontrollers/How-to-Current-Measurement-Calibrate/m-p/729036#M14881 <HTML><HEAD></HEAD><BODY><P>How to calibrate current measurement in s12z microcontroller (I need to calibration procedure)Please help</P></BODY></HTML> Mon, 18 Dec 2017 11:36:28 GMT https://community.nxp.com/t5/S12-MagniV-Microcontrollers/How-to-Current-Measurement-Calibrate/m-p/729036#M14881 embeddedenginee 2017-12-18T11:36:28Z Re: How to Current Measurement Calibrate https://community.nxp.com/t5/S12-MagniV-Microcontrollers/How-to-Current-Measurement-Calibrate/m-p/729037#M14882 <HTML><HEAD></HEAD><BODY><P>Hi,</P><P>Could you elaborate on your request?</P><P>Which S12Z derivative do you use?&nbsp;</P><P></P><P>Regards,</P><P>Daniel</P></BODY></HTML> Tue, 19 Dec 2017 11:02:12 GMT https://community.nxp.com/t5/S12-MagniV-Microcontrollers/How-to-Current-Measurement-Calibrate/m-p/729037#M14882 danielmartynek 2017-12-19T11:02:12Z Re: How to Current Measurement Calibrate https://community.nxp.com/t5/S12-MagniV-Microcontrollers/How-to-Current-Measurement-Calibrate/m-p/729038#M14883 <HTML><HEAD></HEAD><BODY><P>I am using mm9z1j638 need temperature and current calibration procedure for this controller</P></BODY></HTML> Wed, 20 Dec 2017 07:50:41 GMT https://community.nxp.com/t5/S12-MagniV-Microcontrollers/How-to-Current-Measurement-Calibrate/m-p/729038#M14883 embeddedenginee 2017-12-20T07:50:41Z Re: How to Current Measurement Calibrate https://community.nxp.com/t5/S12-MagniV-Microcontrollers/How-to-Current-Measurement-Calibrate/m-p/729039#M14884 <HTML><HEAD></HEAD><BODY><P>Hi,</P><P>the calibration is a quite complex process and the MM9Z1_638 device allows different options on how to use it, e.g. automatic temperature gain compensation or manual gain compensation using chip temperature result and lookup tables. Also the acquisition channel configuration used during operation has to be considered.</P><P></P><P>The system calibration should be performed as an incremental (incremental to NXP provided device calibration data) calibration. <BR />The basic steps are:</P><UL><LI>Characterize system behavior (applying device compensation values)</LI><LI>Estimate deviation between real and ideal behavior (calculate delta between ideal behavior and measured behavior)</LI><LI>Calculate incremental compensation values (delta values)</LI><LI>Apply compensation during operation and verify system behavior</LI></UL><P></P><P><span class="lia-inline-image-display-wrapper" image-alt="pic1.png"><img src="https://community.nxp.com/t5/image/serverpage/image-id/35103iDBBC719FAF943C5D/image-size/large?v=v2&amp;px=999" role="button" title="pic1.png" alt="pic1.png" /></span></P><P></P><P>The following picture indicates which information / data is required to calculate the incremental gain and offset adjustments (gainsteps, offsetsteps).</P><P></P><P><span class="lia-inline-image-display-wrapper" image-alt="pic2.png"><img src="https://community.nxp.com/t5/image/serverpage/image-id/35104i3F2DBBD522F4D858/image-size/large?v=v2&amp;px=999" role="button" title="pic2.png" alt="pic2.png" /></span></P><P>For a good estimation of the acquisition channels behavior, e.g. a 5-point measurement is suitable.<BR /> The selection of the individual data points should consider application requirements like:</P><UL><LI>desired input range</LI><LI>area where highest accuracy is desired</LI><LI>capability of the module / device (e.g. minimum supply voltage for Vsup)</LI><LI>capability of equipment (e.g. max. Iout of power supplies, max. input range of DMM and related accuracy in the range)</LI><LI>select current points for ISENSE calibration such that no gain switching is required</LI></UL><P></P><P>The picture below shows an example setup for the ISENSE channel compensation:</P><P></P><P><span class="lia-inline-image-display-wrapper" image-alt="pic3.png"><img src="https://community.nxp.com/t5/image/serverpage/image-id/35150iF500F5936611F685/image-size/large?v=v2&amp;px=999" role="button" title="pic3.png" alt="pic3.png" /></span></P><P></P><P>To discuss further details it might be better to directly discuss your applications needs?</P><P></P><P>Rgds</P><P>Wolfgang</P></BODY></HTML> Thu, 04 Jan 2018 07:56:40 GMT https://community.nxp.com/t5/S12-MagniV-Microcontrollers/How-to-Current-Measurement-Calibrate/m-p/729039#M14884 Q_man 2018-01-04T07:56:40Z