topic Power analysis on NGX LPC4337-Xplorer board in LPC Microcontrollers https://community.nxp.com/t5/LPC-Microcontrollers/Power-analysis-on-NGX-LPC4337-Xplorer-board/m-p/566563#M17337 <HTML><HEAD></HEAD><BODY><STRONG>Content originally posted in LPCWare by Michele84 on Thu Nov 14 03:51:03 MST 2013</STRONG><BR /><BR /><SPAN>Hi,</SPAN><BR /><BR /><SPAN>I am doing some power analysis on a NGX LPC4337-Xplorer board by measuring the input voltage signals (USB_5V and 3V3 pins) on an oscilloscope.</SPAN><BR /><SPAN>In both cases I have noticed that, every 18 [ms], a periodic signal is visible on the screen (see image 66). </SPAN><BR /><SPAN>This periodic signal is always present (also when the RESET switch is pressed) and is composed by 22 negative peaks (see image 68).</SPAN><BR /><SPAN>The time between two consecutive peaks is sometimes 65 [us] (e.g. first ones) or 130 [us] (e.g. last ones).</SPAN><BR /><BR /><SPAN>Does someone know the cause of this signal and, if so, whether is possible to remove it?</SPAN><BR /><SPAN>Thanks in advance.</SPAN><BR /><BR /><SPAN>Michele.</SPAN></BODY></HTML> Wed, 15 Jun 2016 18:50:20 GMT lpcware 2016-06-15T18:50:20Z Power analysis on NGX LPC4337-Xplorer board https://community.nxp.com/t5/LPC-Microcontrollers/Power-analysis-on-NGX-LPC4337-Xplorer-board/m-p/566563#M17337 <HTML><HEAD></HEAD><BODY><STRONG>Content originally posted in LPCWare by Michele84 on Thu Nov 14 03:51:03 MST 2013</STRONG><BR /><BR /><SPAN>Hi,</SPAN><BR /><BR /><SPAN>I am doing some power analysis on a NGX LPC4337-Xplorer board by measuring the input voltage signals (USB_5V and 3V3 pins) on an oscilloscope.</SPAN><BR /><SPAN>In both cases I have noticed that, every 18 [ms], a periodic signal is visible on the screen (see image 66). </SPAN><BR /><SPAN>This periodic signal is always present (also when the RESET switch is pressed) and is composed by 22 negative peaks (see image 68).</SPAN><BR /><SPAN>The time between two consecutive peaks is sometimes 65 [us] (e.g. first ones) or 130 [us] (e.g. last ones).</SPAN><BR /><BR /><SPAN>Does someone know the cause of this signal and, if so, whether is possible to remove it?</SPAN><BR /><SPAN>Thanks in advance.</SPAN><BR /><BR /><SPAN>Michele.</SPAN></BODY></HTML> Wed, 15 Jun 2016 18:50:20 GMT https://community.nxp.com/t5/LPC-Microcontrollers/Power-analysis-on-NGX-LPC4337-Xplorer-board/m-p/566563#M17337 lpcware 2016-06-15T18:50:20Z