LPC MicrocontrollersのトピックRe: LPC812 power supply requirements https://community.nxp.com/t5/LPC-Microcontrollers/LPC812-power-supply-requirements/m-p/569929#M18036 <HTML><HEAD></HEAD><BODY><STRONG>Content originally posted in LPCWare by Wojtkingson on Tue May 24 05:07:35 MST 2016</STRONG><BR /><SPAN>Solved - Enabled RESET pin, added resistor divider and capacitor to RESET pin, so the LPC starts little bit later and everything works ok.</SPAN></BODY></HTML> Wed, 15 Jun 2016 20:09:42 GMT lpcware 2016-06-15T20:09:42Z LPC812 power supply requirements https://community.nxp.com/t5/LPC-Microcontrollers/LPC812-power-supply-requirements/m-p/569926#M18033 <HTML><HEAD></HEAD><BODY><STRONG>Content originally posted in LPCWare by Wojtkingson on Tue May 24 00:59:03 MST 2016</STRONG><BR /><SPAN>Hi guys,</SPAN><BR /><BR /><SPAN>I would like to ask, if there are any specific power supply requirements for LPC812 (exactly time of rising edge from 0V to 3V). I know, that Vcc should be between 1,8V and 3,6V. I try slow start, so power up takes about 3sec - from 0V to 3V and my LPC has problem to start.</SPAN><BR /><SPAN>It looks like to me, that some clocks are powered up wrong.</SPAN><BR /><BR /><SPAN>My firmware blinks with LED + BOD reset 2,06V - 2,15V</SPAN><BR /><BR /><SPAN>Example</SPAN><BR /><SPAN>1) Slow start from 0V to 3V - 3sec - LPC not running</SPAN><BR /><SPAN>2) LPC turned off by switch for about 2 sec and powered up by switch - LPC still not running, I have to wait more than 3 secs and than LPC runs (It happens only when the LPC is powered up wrong)</SPAN><BR /><BR /><SPAN>When I try this with switch ("fast" start) everything works fine</SPAN><BR /><BR /><SPAN>My test power source is laboratory power supply - 50cm of wires AWG 20 - capacitor 4u7 - capacitor 100nF - LPC812 - resistor - LED</SPAN></BODY></HTML> Wed, 15 Jun 2016 20:09:39 GMT https://community.nxp.com/t5/LPC-Microcontrollers/LPC812-power-supply-requirements/m-p/569926#M18033 lpcware 2016-06-15T20:09:39Z Re: LPC812 power supply requirements https://community.nxp.com/t5/LPC-Microcontrollers/LPC812-power-supply-requirements/m-p/569927#M18034 <HTML><HEAD></HEAD><BODY><STRONG>Content originally posted in LPCWare by vtw.433e on Tue May 24 01:11:26 MST 2016</STRONG><BR /><SPAN>Did you read the Data Sheet (not the UM...):</SPAN><BR /><BR /><SPAN><A class="jive-link-external-small" href="https://community.nxp.com/external-link.jspa?url=http%3A%2F%2Fwww.nxp.com%2Fdocuments%2Fdata_sheet%2FLPC81XM.pdf" rel="nofollow" target="_blank">http://www.nxp.com/documents/data_sheet/LPC81XM.pdf</A></SPAN><BR /><BR /><SPAN>I'm no expert, but 3s for power on? That sounds like about 10-times too long.</SPAN></BODY></HTML> Wed, 15 Jun 2016 20:09:40 GMT https://community.nxp.com/t5/LPC-Microcontrollers/LPC812-power-supply-requirements/m-p/569927#M18034 lpcware 2016-06-15T20:09:40Z Re: LPC812 power supply requirements https://community.nxp.com/t5/LPC-Microcontrollers/LPC812-power-supply-requirements/m-p/569928#M18035 <HTML><HEAD></HEAD><BODY><STRONG>Content originally posted in LPCWare by Wojtkingson on Tue May 24 01:32:28 MST 2016</STRONG><BR /><SPAN>I´ve tried to find this information in UM and Datasheet, but I didn´t find any demands on power supply rising edge.</SPAN></BODY></HTML> Wed, 15 Jun 2016 20:09:41 GMT https://community.nxp.com/t5/LPC-Microcontrollers/LPC812-power-supply-requirements/m-p/569928#M18035 lpcware 2016-06-15T20:09:41Z Re: LPC812 power supply requirements https://community.nxp.com/t5/LPC-Microcontrollers/LPC812-power-supply-requirements/m-p/569929#M18036 <HTML><HEAD></HEAD><BODY><STRONG>Content originally posted in LPCWare by Wojtkingson on Tue May 24 05:07:35 MST 2016</STRONG><BR /><SPAN>Solved - Enabled RESET pin, added resistor divider and capacitor to RESET pin, so the LPC starts little bit later and everything works ok.</SPAN></BODY></HTML> Wed, 15 Jun 2016 20:09:42 GMT https://community.nxp.com/t5/LPC-Microcontrollers/LPC812-power-supply-requirements/m-p/569929#M18036 lpcware 2016-06-15T20:09:42Z Re: LPC812 power supply requirements https://community.nxp.com/t5/LPC-Microcontrollers/LPC812-power-supply-requirements/m-p/569930#M18037 <HTML><HEAD></HEAD><BODY><SPAN>bump</SPAN></BODY></HTML> Sun, 19 Jun 2016 01:11:37 GMT https://community.nxp.com/t5/LPC-Microcontrollers/LPC812-power-supply-requirements/m-p/569930#M18037 lpcware 2016-06-19T01:11:37Z