LPC MicrocontrollersのトピックLPC55S69: crystal-less design https://community.nxp.com/t5/LPC-Microcontrollers/LPC55S69-crystal-less-design/m-p/1022595#M39933 <HTML><HEAD></HEAD><BODY><P>Hello !</P><P></P><P>Do I understand right and MCU can be totally crystalless&nbsp; ? And supports whole declared temperature range ?</P><P></P><P>PLL0 can use FRO_12MHz and generate 100 or 150 Mhz clocks without any problems.</P><P>SPi and I2C can use FRO_12Mhz for clocking ( SPI speed can be 10Mhz ?).</P><P>RTC can own FRO32KHz oscillator but it may be not so precise for keep calendar time.</P><P>Is this so ? How to calculate possible drift while 1 week ?</P><P></P><P>What can be problems if no any crystals is not in use ?</P><P></P><P>Regards,</P><P>Eugene</P></BODY></HTML> Thu, 21 Nov 2019 12:34:24 GMT EugeneHiihtaja 2019-11-21T12:34:24Z LPC55S69: crystal-less design https://community.nxp.com/t5/LPC-Microcontrollers/LPC55S69-crystal-less-design/m-p/1022595#M39933 <HTML><HEAD></HEAD><BODY><P>Hello !</P><P></P><P>Do I understand right and MCU can be totally crystalless&nbsp; ? And supports whole declared temperature range ?</P><P></P><P>PLL0 can use FRO_12MHz and generate 100 or 150 Mhz clocks without any problems.</P><P>SPi and I2C can use FRO_12Mhz for clocking ( SPI speed can be 10Mhz ?).</P><P>RTC can own FRO32KHz oscillator but it may be not so precise for keep calendar time.</P><P>Is this so ? How to calculate possible drift while 1 week ?</P><P></P><P>What can be problems if no any crystals is not in use ?</P><P></P><P>Regards,</P><P>Eugene</P></BODY></HTML> Thu, 21 Nov 2019 12:34:24 GMT https://community.nxp.com/t5/LPC-Microcontrollers/LPC55S69-crystal-less-design/m-p/1022595#M39933 EugeneHiihtaja 2019-11-21T12:34:24Z Re: LPC55S69: crystal-less design https://community.nxp.com/t5/LPC-Microcontrollers/LPC55S69-crystal-less-design/m-p/1022596#M39934 <HTML><HEAD></HEAD><BODY><P>Hi Eugene,</P><P>&nbsp;</P><P>LPC55S69 can be used without external crystal. However, you will not be able to use USB High-Speed without it and RTC will not be as accurate as using external crystal.</P><P>&nbsp;</P><P>Have a great day,<BR />Felipe</P><P></P><P>-------------------------------------------------------------------------------<BR />Note:<BR />- If this post answers your question, please click the "Mark Correct" button. Thank you!</P><P></P><P>- We are following threads for 7 weeks after the last post, later replies are ignored<BR /> Please open a new thread and refer to the closed one, if you have a related question at a later point in time.<BR />-------------------------------------------------------------------------------</P></BODY></HTML> Mon, 25 Nov 2019 15:49:51 GMT https://community.nxp.com/t5/LPC-Microcontrollers/LPC55S69-crystal-less-design/m-p/1022596#M39934 FelipeGarcia 2019-11-25T15:49:51Z