Kinetis MicrocontrollersのトピックRe: MK66FX1M0 USB Feature with external power. Do I need to connect VREGIN and VOUT33 Pins? https://community.nxp.com/t5/Kinetis-Microcontrollers/MK66FX1M0-USB-Feature-with-external-power-Do-I-need-to-connect/m-p/640362#M38782 <HTML><HEAD></HEAD><BODY><P>Thank you very much for your reply. Do you know the purpose of the USB1_VBUS pin?&nbsp;</P><P>Thanks.&nbsp;</P></BODY></HTML> Sun, 05 Mar 2017 15:25:06 GMT christhomas 2017-03-05T15:25:06Z MK66FX1M0 USB Feature with external power. Do I need to connect VREGIN and VOUT33 Pins? https://community.nxp.com/t5/Kinetis-Microcontrollers/MK66FX1M0-USB-Feature-with-external-power-Do-I-need-to-connect/m-p/640360#M38780 <HTML><HEAD></HEAD><BODY><P>Hi all,&nbsp;</P><P></P><P>I am using the&nbsp;<SPAN style="color: #333333; background: #F2F6F8; font-size: 10.0pt;">MK66FX1M0VLQ18 microcontroller and want to use the USB feature. However, I don't to want to connect the USB 5V into VREGIN, instead want to power the microcontroller using an external LDO. For USB to still work, can I leave VREGIN unconnected and VOUT33 connected to 3.3V generated by my LDO.&nbsp;</SPAN></P><P></P><P><SPAN style="color: #333333; background: #F2F6F8; font-size: 10.0pt;">Thanks!</SPAN></P></BODY></HTML> Thu, 16 Feb 2017 01:04:24 GMT https://community.nxp.com/t5/Kinetis-Microcontrollers/MK66FX1M0-USB-Feature-with-external-power-Do-I-need-to-connect/m-p/640360#M38780 christhomas 2017-02-16T01:04:24Z Re: MK66FX1M0 USB Feature with external power. Do I need to connect VREGIN and VOUT33 Pins? https://community.nxp.com/t5/Kinetis-Microcontrollers/MK66FX1M0-USB-Feature-with-external-power-Do-I-need-to-connect/m-p/640361#M38781 <HTML><HEAD></HEAD><BODY><P>No, you have to connect VREGIN to 5V but not limited USB 5V to get the internal USB module powered. VOUT33 can be left unconnected to any other device. Please kindly refer to the following for details.</P><P><span class="lia-inline-image-display-wrapper"><img src="https://community.nxp.com/t5/image/serverpage/image-id/14294i4CF74BB822048378/image-size/large?v=v2&amp;px=999" title="pastedImage_1.png" alt="pastedImage_1.png" /></span></P><P><BR />Hope that helps,<BR />Have a great day,<BR />Kan</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, 17 Feb 2017 03:13:19 GMT https://community.nxp.com/t5/Kinetis-Microcontrollers/MK66FX1M0-USB-Feature-with-external-power-Do-I-need-to-connect/m-p/640361#M38781 Kan_Li 2017-02-17T03:13:19Z Re: MK66FX1M0 USB Feature with external power. Do I need to connect VREGIN and VOUT33 Pins? https://community.nxp.com/t5/Kinetis-Microcontrollers/MK66FX1M0-USB-Feature-with-external-power-Do-I-need-to-connect/m-p/640362#M38782 <HTML><HEAD></HEAD><BODY><P>Thank you very much for your reply. Do you know the purpose of the USB1_VBUS pin?&nbsp;</P><P>Thanks.&nbsp;</P></BODY></HTML> Sun, 05 Mar 2017 15:25:06 GMT https://community.nxp.com/t5/Kinetis-Microcontrollers/MK66FX1M0-USB-Feature-with-external-power-Do-I-need-to-connect/m-p/640362#M38782 christhomas 2017-03-05T15:25:06Z