topic What is the correct PCB design impedance to use for an LPC4330 GPIO/SGPIO output pin? in LPC Microcontrollers https://community.nxp.com/t5/LPC-Microcontrollers/What-is-the-correct-PCB-design-impedance-to-use-for-an-LPC4330/m-p/746548#M30105 <HTML><HEAD></HEAD><BODY><P>In particular, I' designing a high speed SGPIO 8 lane transfer pipe between two LPC4330 and am interested to know if I can avoid adding 33-50 ohm series resistors for a length of less than two inches between processors or not.</P><P>I was not able to find any impedance information in the literature available but assume that no source resistors a re built into the device.&nbsp; Is that true?</P><P></P><P>Tim</P></BODY></HTML> Wed, 28 Mar 2018 21:15:58 GMT timhutcheson 2018-03-28T21:15:58Z What is the correct PCB design impedance to use for an LPC4330 GPIO/SGPIO output pin? https://community.nxp.com/t5/LPC-Microcontrollers/What-is-the-correct-PCB-design-impedance-to-use-for-an-LPC4330/m-p/746548#M30105 <HTML><HEAD></HEAD><BODY><P>In particular, I' designing a high speed SGPIO 8 lane transfer pipe between two LPC4330 and am interested to know if I can avoid adding 33-50 ohm series resistors for a length of less than two inches between processors or not.</P><P>I was not able to find any impedance information in the literature available but assume that no source resistors a re built into the device.&nbsp; Is that true?</P><P></P><P>Tim</P></BODY></HTML> Wed, 28 Mar 2018 21:15:58 GMT https://community.nxp.com/t5/LPC-Microcontrollers/What-is-the-correct-PCB-design-impedance-to-use-for-an-LPC4330/m-p/746548#M30105 timhutcheson 2018-03-28T21:15:58Z Re: What is the correct PCB design impedance to use for an LPC4330 GPIO/SGPIO output pin? https://community.nxp.com/t5/LPC-Microcontrollers/What-is-the-correct-PCB-design-impedance-to-use-for-an-LPC4330/m-p/746549#M30106 <HTML><HEAD></HEAD><BODY><P>Hi Tim Hutcheson,</P><P>&nbsp;&nbsp;&nbsp; Thank you for your interest in LPC product, I would like to provide service for you.</P><P>&nbsp;&nbsp; As I know, the GPIO/SGPIO don't have the specific PCB layout impendance requirement. If the wire length is less than two inches, I think you don't need to add 33-50 ohm.</P><P>&nbsp;&nbsp; Actually, we have an application note: <A href="https://www.nxp.com/docs/en/application-note/AN11343.zip" target="_blank"><STRONG>SGPIO camera module design using LPC4300 </STRONG></A></P><P><STRONG>&nbsp;&nbsp; </STRONG>&nbsp;&nbsp;&nbsp; You can refer to the application note, there has a PCB board which is drawn by eagle design.</P><P></P><P>&nbsp;<span class="lia-inline-image-display-wrapper" image-alt="pastedImage_2.png"><img src="https://community.nxp.com/t5/image/serverpage/image-id/21349i4A23356E5D620F0D/image-size/large?v=v2&amp;px=999" role="button" title="pastedImage_2.png" alt="pastedImage_2.png" /></span></P><P>You can find the SGPIO layout also don't have the resistor. About the wire wide, you also can refer to this board, it is 8mils.</P><P></P><P>Wish it helps you!</P><P>If you still have question about it, please kindly let me know!</P><P></P><P></P><P></P><P><BR />Have a great day,<BR />Kerry</P><P></P><P>-----------------------------------------------------------------------------------------------------------------------<BR />Note: If this post answers your question, please click the Correct Answer button. Thank you!<BR />-----------------------------------------------------------------------------------------------------------------------</P></BODY></HTML> Thu, 29 Mar 2018 06:24:22 GMT https://community.nxp.com/t5/LPC-Microcontrollers/What-is-the-correct-PCB-design-impedance-to-use-for-an-LPC4330/m-p/746549#M30106 kerryzhou 2018-03-29T06:24:22Z