topic Re: MCU Temperature Reading Errors in Kinetis Microcontrollers https://community.nxp.com/t5/Kinetis-Microcontrollers/MCU-Temperature-Reading-Errors/m-p/820776#M49647 <HTML><HEAD></HEAD><BODY><P>Hello,</P><P></P><P>Have you done anything of ADC Calibration? As the manual mentioned: </P><P></P><DIV style="left: 73.329px; top: 168.068px; font-size: 19.0098px; font-family: serif; transform: scaleX(1.01739);">The ADC contains a self-calibration function that is required to achieve the specified accuracy.</DIV><DIV style="left: 73.329px; top: 222.925px; font-size: 19.0098px; font-family: serif; transform: scaleX(1.00131);">Calibration must be run, or valid calibration values written, after any reset and before a conversion is initiated.</DIV></BODY></HTML> Mon, 27 Aug 2018 06:53:26 GMT miduo 2018-08-27T06:53:26Z MCU Temperature Reading Errors https://community.nxp.com/t5/Kinetis-Microcontrollers/MCU-Temperature-Reading-Errors/m-p/820775#M49646 <HTML><HEAD></HEAD><BODY><P>We use a PIT and DMA to scan a number of ADC channels ever ms on a KV31. The ADC clock is 10 Mhz (MCU clock divided by 8). On occasion, post a reboot, the single ended temperature reading from ADC0 will be stuck at 25 C or on rare occasion report roughly 10 C below the actual measured temperature. All other voltages on that ADC appear to be normal.</P><P></P><P>Has anyone had an issue like this?</P><P></P><P>Thanks,</P><P>Dave</P></BODY></HTML> Thu, 23 Aug 2018 13:56:26 GMT https://community.nxp.com/t5/Kinetis-Microcontrollers/MCU-Temperature-Reading-Errors/m-p/820775#M49646 dluks 2018-08-23T13:56:26Z Re: MCU Temperature Reading Errors https://community.nxp.com/t5/Kinetis-Microcontrollers/MCU-Temperature-Reading-Errors/m-p/820776#M49647 <HTML><HEAD></HEAD><BODY><P>Hello,</P><P></P><P>Have you done anything of ADC Calibration? As the manual mentioned: </P><P></P><DIV style="left: 73.329px; top: 168.068px; font-size: 19.0098px; font-family: serif; transform: scaleX(1.01739);">The ADC contains a self-calibration function that is required to achieve the specified accuracy.</DIV><DIV style="left: 73.329px; top: 222.925px; font-size: 19.0098px; font-family: serif; transform: scaleX(1.00131);">Calibration must be run, or valid calibration values written, after any reset and before a conversion is initiated.</DIV></BODY></HTML> Mon, 27 Aug 2018 06:53:26 GMT https://community.nxp.com/t5/Kinetis-Microcontrollers/MCU-Temperature-Reading-Errors/m-p/820776#M49647 miduo 2018-08-27T06:53:26Z