topic LCD & RTC interference in LPC Microcontrollers https://community.nxp.com/t5/LPC-Microcontrollers/LCD-RTC-interference/m-p/588395#M21808 <HTML><HEAD></HEAD><BODY><STRONG>Content originally posted in LPCWare by Atieh on Thu Dec 25 09:50:53 MST 2014</STRONG><BR /><SPAN>I designed a LPC4357 based 4 layer board. A 32KHZ crystal is connected to RTCX1 and RTCX2 pins with 10pF capacitors.</SPAN><BR /><SPAN>The board layers are : top(signal) - mid1(power) - internal plane(GND) - bottom(signal).</SPAN><BR /><SPAN>Internal RTC was working fine till LCD initialise was added to code. Due to LCD, RTC has lag or works fast. How can I eliminate this problem?</SPAN><BR /><BR /><SPAN>Regards</SPAN><BR /><BR /></BODY></HTML> Wed, 15 Jun 2016 19:12:27 GMT lpcware 2016-06-15T19:12:27Z LCD & RTC interference https://community.nxp.com/t5/LPC-Microcontrollers/LCD-RTC-interference/m-p/588395#M21808 <HTML><HEAD></HEAD><BODY><STRONG>Content originally posted in LPCWare by Atieh on Thu Dec 25 09:50:53 MST 2014</STRONG><BR /><SPAN>I designed a LPC4357 based 4 layer board. A 32KHZ crystal is connected to RTCX1 and RTCX2 pins with 10pF capacitors.</SPAN><BR /><SPAN>The board layers are : top(signal) - mid1(power) - internal plane(GND) - bottom(signal).</SPAN><BR /><SPAN>Internal RTC was working fine till LCD initialise was added to code. Due to LCD, RTC has lag or works fast. How can I eliminate this problem?</SPAN><BR /><BR /><SPAN>Regards</SPAN><BR /><BR /></BODY></HTML> Wed, 15 Jun 2016 19:12:27 GMT https://community.nxp.com/t5/LPC-Microcontrollers/LCD-RTC-interference/m-p/588395#M21808 lpcware 2016-06-15T19:12:27Z Re: LCD & RTC interference https://community.nxp.com/t5/LPC-Microcontrollers/LCD-RTC-interference/m-p/588396#M21809 <HTML><HEAD></HEAD><BODY><STRONG>Content originally posted in LPCWare by h.lotfi on Sat Dec 27 08:02:06 MST 2014</STRONG><BR /><SPAN>Hi,</SPAN><BR /><SPAN>i had this problem with LPC1788, after examination i found out this problem is for GND...</SPAN><BR /><SPAN>my RTC GND was weak...</SPAN><BR /><SPAN>i made a new PCB with good GND near RTC capasitors and solve my problem, and my other advise is solder RTC Xtal to GND.</SPAN><BR /><BR /><SPAN>Good luck</SPAN></BODY></HTML> Wed, 15 Jun 2016 19:12:28 GMT https://community.nxp.com/t5/LPC-Microcontrollers/LCD-RTC-interference/m-p/588396#M21809 lpcware 2016-06-15T19:12:28Z