topic K27F-K28F USB VREG_OUT Capacitor in Kinetis Microcontrollers https://community.nxp.com/t5/Kinetis-Microcontrollers/K27F-K28F-USB-VREG-OUT-Capacitor/m-p/1002816#M55945 <HTML><HEAD></HEAD><BODY><P>Hi,</P><P>I just want to know if VREG_OUT (pin G2)&nbsp;should be connected to an external output capacitor (COUT=2.2uF in datasheet) despite of it is not used to power any external circuit. I want to use USB FS with IRC48 as clock source. The microcontroller is powered by&nbsp;an external supply.</P><P></P><P>Thanks!</P></BODY></HTML> Mon, 13 Jan 2020 14:49:33 GMT etronic_arg 2020-01-13T14:49:33Z K27F-K28F USB VREG_OUT Capacitor https://community.nxp.com/t5/Kinetis-Microcontrollers/K27F-K28F-USB-VREG-OUT-Capacitor/m-p/1002816#M55945 <HTML><HEAD></HEAD><BODY><P>Hi,</P><P>I just want to know if VREG_OUT (pin G2)&nbsp;should be connected to an external output capacitor (COUT=2.2uF in datasheet) despite of it is not used to power any external circuit. I want to use USB FS with IRC48 as clock source. The microcontroller is powered by&nbsp;an external supply.</P><P></P><P>Thanks!</P></BODY></HTML> Mon, 13 Jan 2020 14:49:33 GMT https://community.nxp.com/t5/Kinetis-Microcontrollers/K27F-K28F-USB-VREG-OUT-Capacitor/m-p/1002816#M55945 etronic_arg 2020-01-13T14:49:33Z Re: K27F-K28F USB VREG_OUT Capacitor https://community.nxp.com/t5/Kinetis-Microcontrollers/K27F-K28F-USB-VREG-OUT-Capacitor/m-p/1002817#M55946 <HTML><HEAD></HEAD><BODY><P>Hi</P><P></P><P>The capacitor is used to stabilise the low dropout regulator used to supply stable USB PHY power supply. This means that if FS USB is used it must be connected.<SPAN style="text-decoration: underline;"> If not, USB will not work.</SPAN><BR />Make sure that the capacitor type used fulfills the low ESD requirements as specified in the manual and data sheet.</P><P></P><P>Regards</P><P></P><P>Mark</P><P><EM>[uTasker project developer for Kinetis and i.MX RT]</EM></P></BODY></HTML> Mon, 13 Jan 2020 20:22:45 GMT https://community.nxp.com/t5/Kinetis-Microcontrollers/K27F-K28F-USB-VREG-OUT-Capacitor/m-p/1002817#M55946 mjbcswitzerland 2020-01-13T20:22:45Z Re: K27F-K28F USB VREG_OUT Capacitor https://community.nxp.com/t5/Kinetis-Microcontrollers/K27F-K28F-USB-VREG-OUT-Capacitor/m-p/1002818#M55947 <HTML><HEAD></HEAD><BODY><P>Thank you. Just as I&nbsp;thought! I&nbsp;didn't realize to put it in my board...&nbsp;</P></BODY></HTML> Mon, 13 Jan 2020 21:39:05 GMT https://community.nxp.com/t5/Kinetis-Microcontrollers/K27F-K28F-USB-VREG-OUT-Capacitor/m-p/1002818#M55947 etronic_arg 2020-01-13T21:39:05Z