LPC MicrocontrollersのトピックLPC176x RTC crystal and capacitor recommendations https://community.nxp.com/t5/LPC-Microcontrollers/LPC176x-RTC-crystal-and-capacitor-recommendations/m-p/516273#M1589 <HTML><HEAD></HEAD><BODY><STRONG>Content originally posted in LPCWare by parikshitkr on Wed Dec 12 04:32:58 MST 2012</STRONG><BR /><SPAN>Hi,</SPAN><BR /><BR /><SPAN>In LPC1768 datasheet (rev 9) I see in section 14.2 guidelines on Crystal and load capacitor. For RTC I can not find a clear guideline on what crystal to use and load capacitor for it. Could you recommend should be crystal specs, i.e., something similar to Table 22.</SPAN><BR /><BR /><SPAN>regards</SPAN><BR /><SPAN>Parikshit</SPAN></BODY></HTML> Wed, 15 Jun 2016 17:22:25 GMT lpcware 2016-06-15T17:22:25Z LPC176x RTC crystal and capacitor recommendations https://community.nxp.com/t5/LPC-Microcontrollers/LPC176x-RTC-crystal-and-capacitor-recommendations/m-p/516273#M1589 <HTML><HEAD></HEAD><BODY><STRONG>Content originally posted in LPCWare by parikshitkr on Wed Dec 12 04:32:58 MST 2012</STRONG><BR /><SPAN>Hi,</SPAN><BR /><BR /><SPAN>In LPC1768 datasheet (rev 9) I see in section 14.2 guidelines on Crystal and load capacitor. For RTC I can not find a clear guideline on what crystal to use and load capacitor for it. Could you recommend should be crystal specs, i.e., something similar to Table 22.</SPAN><BR /><BR /><SPAN>regards</SPAN><BR /><SPAN>Parikshit</SPAN></BODY></HTML> Wed, 15 Jun 2016 17:22:25 GMT https://community.nxp.com/t5/LPC-Microcontrollers/LPC176x-RTC-crystal-and-capacitor-recommendations/m-p/516273#M1589 lpcware 2016-06-15T17:22:25Z Re: LPC176x RTC crystal and capacitor recommendations https://community.nxp.com/t5/LPC-Microcontrollers/LPC176x-RTC-crystal-and-capacitor-recommendations/m-p/516274#M1590 <HTML><HEAD></HEAD><BODY><STRONG>Content originally posted in LPCWare by Daniel Widyanto on Wed Dec 19 00:31:00 MST 2012</STRONG><BR /><SPAN>Hi,</SPAN><BR /><BR /><SPAN>The RTC oscillator recommended 32kHz crystal to have: </SPAN><BR /><SPAN>- CL (Crystal Cap load): 11pf, Max Rs (Crystal series resistance) &lt; 100kohm, Recommended external cap: 18pF (or)</SPAN><BR /><SPAN>- CL (Crystal Cap load): 13pf, Max Rs (Crystal series resistance) &lt; 100kohm, Recommended external cap: 22pF (or)</SPAN><BR /><SPAN>- CL (Crystal Cap load): 15pf, Max Rs (Crystal series resistance) &lt; 100kohm, Recommended external cap: 27pF</SPAN><BR /><BR /><SPAN>We'll feedback your input for the RTC xtal selection into User Manual. Thanks for bringing this up</SPAN><BR /></BODY></HTML> Wed, 15 Jun 2016 17:22:26 GMT https://community.nxp.com/t5/LPC-Microcontrollers/LPC176x-RTC-crystal-and-capacitor-recommendations/m-p/516274#M1590 lpcware 2016-06-15T17:22:26Z