Kinetis MicrocontrollersのトピックIs it possible to clock USB module with IRC? https://community.nxp.com/t5/Kinetis-Microcontrollers/Is-it-possible-to-clock-USB-module-with-IRC/m-p/252486#M7232 <HTML><HEAD></HEAD><BODY><P>Recently I am considering to design a macro USB dongle for Android (as HID/CDC device). Due to its limited space, I am trying to find a USB micro which can operate without external crystal. I know Microchip/Cypress can do, but STM claims that USB has to work with external crystal.</P><P></P><P>Can I use IRC(4MHz) of KL24/25Z as clock source for USB OTG?</P><P></P><P>Allan</P></BODY></HTML> Fri, 05 Apr 2013 05:01:50 GMT allankliu 2013-04-05T05:01:50Z Is it possible to clock USB module with IRC? https://community.nxp.com/t5/Kinetis-Microcontrollers/Is-it-possible-to-clock-USB-module-with-IRC/m-p/252486#M7232 <HTML><HEAD></HEAD><BODY><P>Recently I am considering to design a macro USB dongle for Android (as HID/CDC device). Due to its limited space, I am trying to find a USB micro which can operate without external crystal. I know Microchip/Cypress can do, but STM claims that USB has to work with external crystal.</P><P></P><P>Can I use IRC(4MHz) of KL24/25Z as clock source for USB OTG?</P><P></P><P>Allan</P></BODY></HTML> Fri, 05 Apr 2013 05:01:50 GMT https://community.nxp.com/t5/Kinetis-Microcontrollers/Is-it-possible-to-clock-USB-module-with-IRC/m-p/252486#M7232 allankliu 2013-04-05T05:01:50Z Re: Is it possible to clock USB module with IRC? https://community.nxp.com/t5/Kinetis-Microcontrollers/Is-it-possible-to-clock-USB-module-with-IRC/m-p/252487#M7233 <HTML><HEAD></HEAD><BODY><P>It's not recommended to use internal clock for USB applications.</P></BODY></HTML> Fri, 05 Apr 2013 05:45:38 GMT https://community.nxp.com/t5/Kinetis-Microcontrollers/Is-it-possible-to-clock-USB-module-with-IRC/m-p/252487#M7233 DerekLau 2013-04-05T05:45:38Z Re: Is it possible to clock USB module with IRC? https://community.nxp.com/t5/Kinetis-Microcontrollers/Is-it-possible-to-clock-USB-module-with-IRC/m-p/252488#M7234 <HTML><HEAD></HEAD><BODY><P>It is impossible to use IRC for USB module because the internal reference clock does not have required accuracy which is strictly needed for peripheral USB.</P><P></P><P>Regard</P><P>Pavel</P></BODY></HTML> Fri, 05 Apr 2013 08:08:22 GMT https://community.nxp.com/t5/Kinetis-Microcontrollers/Is-it-possible-to-clock-USB-module-with-IRC/m-p/252488#M7234 pavel_krenek 2013-04-05T08:08:22Z Re: Is it possible to clock USB module with IRC? https://community.nxp.com/t5/Kinetis-Microcontrollers/Is-it-possible-to-clock-USB-module-with-IRC/m-p/252489#M7235 <HTML><HEAD></HEAD><BODY><P>For just CDC, the CP2105 is a tiny self-contained UBS-to-serial device.&nbsp; Smaller &amp; cheaper than an osc.</P></BODY></HTML> Wed, 01 May 2013 01:28:33 GMT https://community.nxp.com/t5/Kinetis-Microcontrollers/Is-it-possible-to-clock-USB-module-with-IRC/m-p/252489#M7235 egoodii 2013-05-01T01:28:33Z