topic Re: How to use LPC4370FET100 HSADC in true differential mode? in LPC Microcontrollers https://community.nxp.com/t5/LPC-Microcontrollers/How-to-use-LPC4370FET100-HSADC-in-true-differential-mode/m-p/728003#M29451 <HTML><HEAD></HEAD><BODY><P>Hi,</P><P></P><P>The <A href="https://www.nxp.com/docs/en/data-sheet/LPC4370.pdf">LPC4370 datasheet</A> page143 with below description:</P><P>When DCINNEG is set to 1:</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/4705iDF8D0AA0F89FFB74/image-size/large?v=v2&amp;px=999" role="button" title="pastedImage_1.png" alt="pastedImage_1.png" /></span></P><P>When DCINNEG is set to 0, provided voltage at ADCHS_NEG pin (ADCHS be used in true differential mode):</P><P><span class="lia-inline-image-display-wrapper" image-alt="pastedImage_2.png"><img src="https://community.nxp.com/t5/image/serverpage/image-id/4747i8B7941CB68D942C1/image-size/large?v=v2&amp;px=999" role="button" title="pastedImage_2.png" alt="pastedImage_2.png" /></span></P><P>Wish it helps.</P><P><BR />Have a great day,<BR />Mike</P><P></P><P>-----------------------------------------------------------------------------------------------------------------------<BR />Note: If this post answers your question, please click the Correct Answer button. Thank you!<BR />-----------------------------------------------------------------------------------------------------------------------</P></BODY></HTML> Fri, 09 Feb 2018 05:30:41 GMT Hui_Ma 2018-02-09T05:30:41Z How to use LPC4370FET100 HSADC in true differential mode? https://community.nxp.com/t5/LPC-Microcontrollers/How-to-use-LPC4370FET100-HSADC-in-true-differential-mode/m-p/728002#M29450 <HTML><HEAD></HEAD><BODY><P>Hello,</P><P></P><P>I'm trying to set up the 12-bit ADC on the LPC4730FET100 (using LPC-Link2 as a demo board) to operate in true differential mode. I want to use ADCHS_0 (pin A2) as the positive end analog input, and ADCHS_NEG (pin A3) as negative end analog input. The only information I can find in the user manual says:&nbsp; "It is possible to deselect the internal vin_neg and supply vin_neg externally at pin ADCHS_NEG by setting DCINNEG to 0. When only one input is used then the ADC can be used in true differential mode."&nbsp; However, after setting DCINNEG = 0, ADCHS_NEG (pin A3) still outputs 0.5 volts. Is there something else I need to do to configure ADCHS_NEG as an input?</P><P></P><P>Thank you</P></BODY></HTML> Wed, 07 Feb 2018 20:03:52 GMT https://community.nxp.com/t5/LPC-Microcontrollers/How-to-use-LPC4370FET100-HSADC-in-true-differential-mode/m-p/728002#M29450 brandongallian 2018-02-07T20:03:52Z Re: How to use LPC4370FET100 HSADC in true differential mode? https://community.nxp.com/t5/LPC-Microcontrollers/How-to-use-LPC4370FET100-HSADC-in-true-differential-mode/m-p/728003#M29451 <HTML><HEAD></HEAD><BODY><P>Hi,</P><P></P><P>The <A href="https://www.nxp.com/docs/en/data-sheet/LPC4370.pdf">LPC4370 datasheet</A> page143 with below description:</P><P>When DCINNEG is set to 1:</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/4705iDF8D0AA0F89FFB74/image-size/large?v=v2&amp;px=999" role="button" title="pastedImage_1.png" alt="pastedImage_1.png" /></span></P><P>When DCINNEG is set to 0, provided voltage at ADCHS_NEG pin (ADCHS be used in true differential mode):</P><P><span class="lia-inline-image-display-wrapper" image-alt="pastedImage_2.png"><img src="https://community.nxp.com/t5/image/serverpage/image-id/4747i8B7941CB68D942C1/image-size/large?v=v2&amp;px=999" role="button" title="pastedImage_2.png" alt="pastedImage_2.png" /></span></P><P>Wish it helps.</P><P><BR />Have a great day,<BR />Mike</P><P></P><P>-----------------------------------------------------------------------------------------------------------------------<BR />Note: If this post answers your question, please click the Correct Answer button. Thank you!<BR />-----------------------------------------------------------------------------------------------------------------------</P></BODY></HTML> Fri, 09 Feb 2018 05:30:41 GMT https://community.nxp.com/t5/LPC-Microcontrollers/How-to-use-LPC4370FET100-HSADC-in-true-differential-mode/m-p/728003#M29451 Hui_Ma 2018-02-09T05:30:41Z