topic Re: mpc5744 Adc sampling inaccurate in Kinetis Microcontrollers https://community.nxp.com/t5/Kinetis-Microcontrollers/mpc5744-Adc-sampling-inaccurate/m-p/849974#M51131 <HTML><HEAD></HEAD><BODY><P>Hi,</P><P>Do you use our EVB for these tests or its your own custom board?</P><P>Do you calibrate ADCs before conversion?</P><P>Did you tried to measure it on different pins for ADC1?</P><P></P><P>regards,</P><P>Peter</P></BODY></HTML> Tue, 14 May 2019 10:29:43 GMT petervlna 2019-05-14T10:29:43Z mpc5744 Adc sampling inaccurate https://community.nxp.com/t5/Kinetis-Microcontrollers/mpc5744-Adc-sampling-inaccurate/m-p/849973#M51130 <HTML><HEAD></HEAD><BODY><P>MPC5744P chip ADC sampling, the reference voltage is 5V ,ADC0 and ADC1 sampling port peripheral reference voltage circuits are the same. The software is configured with ADC0 port 0 channel, ADC1 port 0 channel sampling at the same time, the external input analog voltage has 0 ~ 5 V change; Phenomenon: ADC0 port 0 channel sampling is normal, external voltage 2.5 V shows AD value 2045; When the external voltage of the ADC1 port 1 channel is 2.5V, the AD value 1750A DC0 changes linearly with the external voltage analog signal, and the ADC1 changes linearly with the external voltage analog signal (0 v corresponding to AD value 0 V to 5 v to AD value 4095, intermediate nonlinearity).</P><P>May I ask which points may have caused this phenomenon to occur?</P></BODY></HTML> Sun, 09 Dec 2018 15:16:13 GMT https://community.nxp.com/t5/Kinetis-Microcontrollers/mpc5744-Adc-sampling-inaccurate/m-p/849973#M51130 chenbg188175751 2018-12-09T15:16:13Z Re: mpc5744 Adc sampling inaccurate https://community.nxp.com/t5/Kinetis-Microcontrollers/mpc5744-Adc-sampling-inaccurate/m-p/849974#M51131 <HTML><HEAD></HEAD><BODY><P>Hi,</P><P>Do you use our EVB for these tests or its your own custom board?</P><P>Do you calibrate ADCs before conversion?</P><P>Did you tried to measure it on different pins for ADC1?</P><P></P><P>regards,</P><P>Peter</P></BODY></HTML> Tue, 14 May 2019 10:29:43 GMT https://community.nxp.com/t5/Kinetis-Microcontrollers/mpc5744-Adc-sampling-inaccurate/m-p/849974#M51131 petervlna 2019-05-14T10:29:43Z