topic LPC43xx USB1_DP/DM Add an external series resistor of 33r in LPC Microcontrollers https://community.nxp.com/t5/LPC-Microcontrollers/LPC43xx-USB1-DP-DM-Add-an-external-series-resistor-of-33r/m-p/676030#M27108 <HTML><HEAD></HEAD><BODY><P>i find the spec. about UBS1_DP/USB1_DM need add an external series resistor of 33r.</P><P><span class="lia-inline-image-display-wrapper" image-alt="QQ截图20170719214051.png"><img src="https://community.nxp.com/t5/image/serverpage/image-id/26833i0DB6E445D64FD9B2/image-size/large?v=v2&amp;px=999" role="button" title="QQ截图20170719214051.png" alt="QQ截图20170719214051.png" /></span></P><P>however,the application about USB1,ex. MCB4300-board,there is no resister added.</P><P></P><P>So ,the resister is&nbsp;Necessary?</P></BODY></HTML> Wed, 19 Jul 2017 13:43:32 GMT skysky 2017-07-19T13:43:32Z LPC43xx USB1_DP/DM Add an external series resistor of 33r https://community.nxp.com/t5/LPC-Microcontrollers/LPC43xx-USB1-DP-DM-Add-an-external-series-resistor-of-33r/m-p/676030#M27108 <HTML><HEAD></HEAD><BODY><P>i find the spec. about UBS1_DP/USB1_DM need add an external series resistor of 33r.</P><P><span class="lia-inline-image-display-wrapper" image-alt="QQ截图20170719214051.png"><img src="https://community.nxp.com/t5/image/serverpage/image-id/26833i0DB6E445D64FD9B2/image-size/large?v=v2&amp;px=999" role="button" title="QQ截图20170719214051.png" alt="QQ截图20170719214051.png" /></span></P><P>however,the application about USB1,ex. MCB4300-board,there is no resister added.</P><P></P><P>So ,the resister is&nbsp;Necessary?</P></BODY></HTML> Wed, 19 Jul 2017 13:43:32 GMT https://community.nxp.com/t5/LPC-Microcontrollers/LPC43xx-USB1-DP-DM-Add-an-external-series-resistor-of-33r/m-p/676030#M27108 skysky 2017-07-19T13:43:32Z Re: LPC43xx USB1_DP/DM Add an external series resistor of 33r https://community.nxp.com/t5/LPC-Microcontrollers/LPC43xx-USB1-DP-DM-Add-an-external-series-resistor-of-33r/m-p/676031#M27109 <HTML><HEAD></HEAD><BODY><P>Hi,</P><P></P><P>Yes, it is necessary for USB1. Please check the OM13088: LPCXpresso4367 Development board as example.</P><P><A class="link-titled" href="http://www.nxp.com/downloads/en/schematics/LPCX43xx_18xx_V3_Schematic_Rev-B.pdf" title="http://www.nxp.com/downloads/en/schematics/LPCX43xx_18xx_V3_Schematic_Rev-B.pdf">http://www.nxp.com/downloads/en/schematics/LPCX43xx_18xx_V3_Schematic_Rev-B.pdf</A>&nbsp;</P><P><span class="lia-inline-image-display-wrapper" image-alt="pastedImage_4.png"><img src="https://community.nxp.com/t5/image/serverpage/image-id/27440i8AC0A19074DAE041/image-size/large?v=v2&amp;px=999" role="button" title="pastedImage_4.png" alt="pastedImage_4.png" /></span></P><P><BR />Have a great day,<BR />Soledad</P><P></P><P>-----------------------------------------------------------------------------------------------------------------------<BR />Note: If this post answers your question, please click the Correct Answer button. Thank you!<BR />-----------------------------------------------------------------------------------------------------------------------</P></BODY></HTML> Wed, 19 Jul 2017 17:39:17 GMT https://community.nxp.com/t5/LPC-Microcontrollers/LPC43xx-USB1-DP-DM-Add-an-external-series-resistor-of-33r/m-p/676031#M27109 soledad 2017-07-19T17:39:17Z Re: LPC43xx USB1_DP/DM Add an external series resistor of 33r https://community.nxp.com/t5/LPC-Microcontrollers/LPC43xx-USB1-DP-DM-Add-an-external-series-resistor-of-33r/m-p/676032#M27110 <HTML><HEAD></HEAD><BODY><P>HI soledad:</P><P>&nbsp; thank you for your reply</P></BODY></HTML> Thu, 20 Jul 2017 05:36:49 GMT https://community.nxp.com/t5/LPC-Microcontrollers/LPC43xx-USB1-DP-DM-Add-an-external-series-resistor-of-33r/m-p/676032#M27110 skysky 2017-07-20T05:36:49Z