MPC5xxx中的主题 TSENS MPC5675K https://community.nxp.com/t5/MPC5xxx/TSENS-MPC5675K/m-p/641918#M6397 <HTML><HEAD></HEAD><BODY><P style="color: #51626f; background-color: #ffffff; border: 0px;">I am working with Laura on the&nbsp;<SPAN style="color: #51626f; background-color: #ffffff; border: 0px; font-weight: inherit;">MPC5675K temperature sensor issue. &nbsp;We are consistently seeing the calculated value of the sensor to be +18 to +20 degrees C above the case temperature. &nbsp;This is outside the specified +/-10 C tolerance.</SPAN></P><P style="min-height: 8pt; padding: 0px; color: #51626f; background-color: #ffffff; border: 0px;">&nbsp;</P><P style="color: #51626f; background-color: #ffffff; border: 0px;"><SPAN style="color: #51626f; background-color: #ffffff; border: 0px; font-weight: inherit;">Your answer stated "the </SPAN><SPAN>ADC reference does not affect accuracy of temperature sensor. &nbsp;<SPAN style="background-color: #ffffff;"> Even though it is a bit different it should be still in specified tolerance +/-10°C. Note that this sensor is relatively imprecise".</SPAN></SPAN></P><P style="min-height: 8pt; padding: 0px; color: #51626f; background-color: #ffffff; border: 0px;">&nbsp;</P><P style="color: #51626f; background-color: #ffffff; border: 0px;">Does this imply the ratio of the 5 V ref vs. a 3.3 V ref should not be used in the calculation?</P><P style="min-height: 8pt; padding: 0px; color: #51626f; background-color: #ffffff; border: 0px;">&nbsp;</P><P style="color: #51626f; background-color: #ffffff; border: 0px;"><SPAN style="color: #51626f; background-color: #ffffff; border: 0px; font-weight: inherit;"> What is the recommended method to account for the 5 vdc reference in the TSENS calculation?</SPAN></P></BODY></HTML> Thu, 22 Sep 2016 13:25:14 GMT wittkop 2016-09-22T13:25:14Z TSENS MPC5675K https://community.nxp.com/t5/MPC5xxx/TSENS-MPC5675K/m-p/641918#M6397 <HTML><HEAD></HEAD><BODY><P style="color: #51626f; background-color: #ffffff; border: 0px;">I am working with Laura on the&nbsp;<SPAN style="color: #51626f; background-color: #ffffff; border: 0px; font-weight: inherit;">MPC5675K temperature sensor issue. &nbsp;We are consistently seeing the calculated value of the sensor to be +18 to +20 degrees C above the case temperature. &nbsp;This is outside the specified +/-10 C tolerance.</SPAN></P><P style="min-height: 8pt; padding: 0px; color: #51626f; background-color: #ffffff; border: 0px;">&nbsp;</P><P style="color: #51626f; background-color: #ffffff; border: 0px;"><SPAN style="color: #51626f; background-color: #ffffff; border: 0px; font-weight: inherit;">Your answer stated "the </SPAN><SPAN>ADC reference does not affect accuracy of temperature sensor. &nbsp;<SPAN style="background-color: #ffffff;"> Even though it is a bit different it should be still in specified tolerance +/-10°C. Note that this sensor is relatively imprecise".</SPAN></SPAN></P><P style="min-height: 8pt; padding: 0px; color: #51626f; background-color: #ffffff; border: 0px;">&nbsp;</P><P style="color: #51626f; background-color: #ffffff; border: 0px;">Does this imply the ratio of the 5 V ref vs. a 3.3 V ref should not be used in the calculation?</P><P style="min-height: 8pt; padding: 0px; color: #51626f; background-color: #ffffff; border: 0px;">&nbsp;</P><P style="color: #51626f; background-color: #ffffff; border: 0px;"><SPAN style="color: #51626f; background-color: #ffffff; border: 0px; font-weight: inherit;"> What is the recommended method to account for the 5 vdc reference in the TSENS calculation?</SPAN></P></BODY></HTML> Thu, 22 Sep 2016 13:25:14 GMT https://community.nxp.com/t5/MPC5xxx/TSENS-MPC5675K/m-p/641918#M6397 wittkop 2016-09-22T13:25:14Z Re: TSENS MPC5675K https://community.nxp.com/t5/MPC5xxx/TSENS-MPC5675K/m-p/641919#M6398 <HTML><HEAD></HEAD><BODY><P>Here I have shared example code based on equations based on current reference manual revision (note it has been updated in rev.10):</P><P><A href="https://community.nxp.com/docs/DOC-332735">https://community.nxp.com/docs/DOC-332735</A>&nbsp;</P><P></P><P>There is no difference in measured temperature when switching ADC reference between 5 and 3.3V.</P></BODY></HTML> Thu, 22 Sep 2016 13:45:08 GMT https://community.nxp.com/t5/MPC5xxx/TSENS-MPC5675K/m-p/641919#M6398 davidtosenovjan 2016-09-22T13:45:08Z