LPC MicrocontrollersのトピックUSB voltage supply for full/high-speed https://community.nxp.com/t5/LPC-Microcontrollers/USB-voltage-supply-for-full-high-speed/m-p/876942#M35074 <HTML><HEAD></HEAD><BODY><P>I have been going over the documentation for the&nbsp;LPC546xx and have a question about the Vdd needed for USB&nbsp;</P><P>this is on page 87 in the datasheet&nbsp;</P><P></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/67113i80CDE7391E2F55CB/image-size/large?v=v2&amp;px=999" role="button" title="pastedImage_1.png" alt="pastedImage_1.png" /></span></P><P>It is mention that you need a higher voltage to use USB full-speed than the USB high-speed&nbsp;</P><P>any input to why this is the case ?</P><P></P><P>Br</P><P>Mikkel</P></BODY></HTML> Thu, 07 Mar 2019 15:18:44 GMT mikkelbjerring 2019-03-07T15:18:44Z USB voltage supply for full/high-speed https://community.nxp.com/t5/LPC-Microcontrollers/USB-voltage-supply-for-full-high-speed/m-p/876942#M35074 <HTML><HEAD></HEAD><BODY><P>I have been going over the documentation for the&nbsp;LPC546xx and have a question about the Vdd needed for USB&nbsp;</P><P>this is on page 87 in the datasheet&nbsp;</P><P></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/67113i80CDE7391E2F55CB/image-size/large?v=v2&amp;px=999" role="button" title="pastedImage_1.png" alt="pastedImage_1.png" /></span></P><P>It is mention that you need a higher voltage to use USB full-speed than the USB high-speed&nbsp;</P><P>any input to why this is the case ?</P><P></P><P>Br</P><P>Mikkel</P></BODY></HTML> Thu, 07 Mar 2019 15:18:44 GMT https://community.nxp.com/t5/LPC-Microcontrollers/USB-voltage-supply-for-full-high-speed/m-p/876942#M35074 mikkelbjerring 2019-03-07T15:18:44Z Re: USB voltage supply for full/high-speed https://community.nxp.com/t5/LPC-Microcontrollers/USB-voltage-supply-for-full-high-speed/m-p/876943#M35075 <HTML><HEAD></HEAD><BODY><P>Hi, Mikkel,</P><P></P><P>This is my opinion, I think the full-speed USB of LPC546xx uses the old usb IP as the other old LPC family, because of historical reason, the old USB IP requires that VDD voltage must be in the range from 3.0V to 3.6V.</P><P>Hope it can help you</P><P>BR</P><P>XiangJun Rong</P></BODY></HTML> Mon, 29 Apr 2019 07:01:56 GMT https://community.nxp.com/t5/LPC-Microcontrollers/USB-voltage-supply-for-full-high-speed/m-p/876943#M35075 xiangjun_rong 2019-04-29T07:01:56Z