topic Question about ADC bandgap voltage value in S32K https://community.nxp.com/t5/S32K/Question-about-ADC-bandgap-voltage-value/m-p/1048062#M6876 <HTML><HEAD></HEAD><BODY><P>Hello everyone.</P><P>Now I use ADC module of s32k146, and have get adc value of banggap. It's about 0.98v after converter.</P><P>In datesheet, the bandgap voltage value is described as below:</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/109231i30BF72B9D855A729/image-size/large?v=v2&amp;px=999" role="button" title="pastedImage_1.png" alt="pastedImage_1.png" /></span></P><P>How can I know the precisely bandgap voltage value of my chip? And how to judge there is some error of adc module or the bandgap voltage value is really 0.98V?</P><P></P><P>Thank you.</P></BODY></HTML> Fri, 31 Jul 2020 08:24:09 GMT zyt 2020-07-31T08:24:09Z Question about ADC bandgap voltage value https://community.nxp.com/t5/S32K/Question-about-ADC-bandgap-voltage-value/m-p/1048062#M6876 <HTML><HEAD></HEAD><BODY><P>Hello everyone.</P><P>Now I use ADC module of s32k146, and have get adc value of banggap. It's about 0.98v after converter.</P><P>In datesheet, the bandgap voltage value is described as below:</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/109231i30BF72B9D855A729/image-size/large?v=v2&amp;px=999" role="button" title="pastedImage_1.png" alt="pastedImage_1.png" /></span></P><P>How can I know the precisely bandgap voltage value of my chip? And how to judge there is some error of adc module or the bandgap voltage value is really 0.98V?</P><P></P><P>Thank you.</P></BODY></HTML> Fri, 31 Jul 2020 08:24:09 GMT https://community.nxp.com/t5/S32K/Question-about-ADC-bandgap-voltage-value/m-p/1048062#M6876 zyt 2020-07-31T08:24:09Z Re: Question about ADC bandgap voltage value https://community.nxp.com/t5/S32K/Question-about-ADC-bandgap-voltage-value/m-p/1048063#M6877 <HTML><HEAD></HEAD><BODY><P>Hi, if you measure 0.98V, it is perfectly within specified range.</P><P></P><P>Bandgap voltage is fixed voltage reference, more or less independent on reference voltage (imagine Zener diode).</P><P></P><P>Regarding evaluation of ADC accuracy I would recommend to use different channel (calibrated laboratory voltage source), as here you cannot distinguish between band gap tolerance and ADC error contribution.</P></BODY></HTML> Mon, 03 Aug 2020 11:21:49 GMT https://community.nxp.com/t5/S32K/Question-about-ADC-bandgap-voltage-value/m-p/1048063#M6877 davidtosenovjan 2020-08-03T11:21:49Z Re: Question about ADC bandgap voltage value https://community.nxp.com/t5/S32K/Question-about-ADC-bandgap-voltage-value/m-p/1400820#M13693 <P>Hello, what is the ADC count value?&nbsp; about 819?&nbsp; thanks</P> Tue, 18 Jan 2022 09:09:35 GMT https://community.nxp.com/t5/S32K/Question-about-ADC-bandgap-voltage-value/m-p/1400820#M13693 949147417 2022-01-18T09:09:35Z