https://community.nxp.com/t5/MPC5xxx/MPC5646C-adc-reference-voltage/m-p/638410#M6221 <HTML><HEAD></HEAD><BODY><P>Hello,</P><P></P><P>I don't understand how adc voltage reference works on this microcontroller family.</P><P></P><P>Is there an internal voltage reference made with the input voltage on VDD_HV_ADC0 pin or do I have to use an external voltage reference and put it on VDD_HV_ADC0 pin?</P><P></P><P>It is said in the datasheet that Vdd_ADC0 has to be equal to VDD_HV_A +/-0.1V. But if it is the case, i can't use an external reference voltage. For now i have connected all the supply pins to the same voltage (5V). But the accuracy of the 5V is about 2%, wich is the total accuracy i need on my measures !</P><P></P><P>Thank you for your time.</P><P>Robin</P></BODY></HTML> Mon, 24 Apr 2017 16:13:41 GMT robinauriol 2017-04-24T16:13:41Z https://community.nxp.com/t5/MPC5xxx/MPC5646C-adc-reference-voltage/m-p/638410#M6221 <HTML><HEAD></HEAD><BODY><P>Hello,</P><P></P><P>I don't understand how adc voltage reference works on this microcontroller family.</P><P></P><P>Is there an internal voltage reference made with the input voltage on VDD_HV_ADC0 pin or do I have to use an external voltage reference and put it on VDD_HV_ADC0 pin?</P><P></P><P>It is said in the datasheet that Vdd_ADC0 has to be equal to VDD_HV_A +/-0.1V. But if it is the case, i can't use an external reference voltage. For now i have connected all the supply pins to the same voltage (5V). But the accuracy of the 5V is about 2%, wich is the total accuracy i need on my measures !</P><P></P><P>Thank you for your time.</P><P>Robin</P></BODY></HTML> Mon, 24 Apr 2017 16:13:41 GMT https://community.nxp.com/t5/MPC5xxx/MPC5646C-adc-reference-voltage/m-p/638410#M6221 robinauriol 2017-04-24T16:13:41Z https://community.nxp.com/t5/MPC5xxx/MPC5646C-adc-reference-voltage/m-p/638411#M6222 <HTML><HEAD></HEAD><BODY><P>Hi, I am afraid that this device does not have separated ADC voltage reference and ADC power supply, you apparently cannot use different power rails and it must me derived from one source.</P></BODY></HTML> Tue, 25 Apr 2017 10:28:30 GMT https://community.nxp.com/t5/MPC5xxx/MPC5646C-adc-reference-voltage/m-p/638411#M6222 davidtosenovjan 2017-04-25T10:28:30Z https://community.nxp.com/t5/MPC5xxx/MPC5646C-adc-reference-voltage/m-p/638412#M6223 <HTML><HEAD></HEAD><BODY><P>One note about recommended ferrite bead:</P><P><span class="lia-inline-image-display-wrapper" image-alt="pastedImage_1.png"><img src="https://community.nxp.com/t5/image/serverpage/image-id/14102i7C8C0299DCA0855C/image-size/large?v=v2&amp;px=999" role="button" title="pastedImage_1.png" alt="pastedImage_1.png" /></span></P></BODY></HTML> Tue, 25 Apr 2017 10:42:47 GMT https://community.nxp.com/t5/MPC5xxx/MPC5646C-adc-reference-voltage/m-p/638412#M6223 davidtosenovjan 2017-04-25T10:42:47Z https://community.nxp.com/t5/MPC5xxx/MPC5646C-adc-reference-voltage/m-p/638413#M6224 <HTML><HEAD></HEAD><BODY><P><A class="jx-jive-macro-user" href="https://community.nxp.com/people/davidtosenovjan">davidtosenovjan</A>‌, could you please share the document above you have taken the screenshot from? I cannot seem to find this in any of the hardware design guides I found online. I would like to reference it for any other design guidelines.&nbsp;</P><P></P><P>Thank you.</P></BODY></HTML> Mon, 01 Jul 2019 14:32:08 GMT https://community.nxp.com/t5/MPC5xxx/MPC5646C-adc-reference-voltage/m-p/638413#M6224 rkandiah 2019-07-01T14:32:08Z https://community.nxp.com/t5/MPC5xxx/MPC5646C-adc-reference-voltage/m-p/638414#M6225 <HTML><HEAD></HEAD><BODY><P>Unfortunately the document is confidential and I cannot share it with you.</P></BODY></HTML> Mon, 08 Jul 2019 07:20:27 GMT https://community.nxp.com/t5/MPC5xxx/MPC5646C-adc-reference-voltage/m-p/638414#M6225 davidtosenovjan 2019-07-08T07:20:27Z