LPC MicrocontrollersのトピックLPC1769 power question https://community.nxp.com/t5/LPC-Microcontrollers/LPC1769-power-question/m-p/523038#M5674 <HTML><HEAD></HEAD><BODY><STRONG>Content originally posted in LPCWare by CharlesM on Sat Feb 08 21:56:17 MST 2014</STRONG><BR /><SPAN>I'm using a LPC1769 based LPCxpresso board. The LPC Link board is attached and no jumper connections have been severed or altered from the default factory configuration.</SPAN><BR /><BR /><SPAN>If I apply +5V from a 7805 regulator to pin J6-2 (EXT_POWX) of the LPC1769 board, what should be done with pin J6-28 (VIO_3V3X)? Do I need an additional 3.3V regulator to power VIO_3V3X as well, or can that pin be left open?</SPAN><BR /><BR /><SPAN>&lt;!--break--&gt;</SPAN><BR /><BR /><SPAN>The schematics indicate it is an input when the board is externally powered via EXT_POWX (as opposed to self-powered through USB), but I'm not sure how the attached LPC-Link board affects the VIO_3V3/VIO_3V3X signals.</SPAN></BODY></HTML> Wed, 15 Jun 2016 17:57:58 GMT lpcware 2016-06-15T17:57:58Z LPC1769 power question https://community.nxp.com/t5/LPC-Microcontrollers/LPC1769-power-question/m-p/523038#M5674 <HTML><HEAD></HEAD><BODY><STRONG>Content originally posted in LPCWare by CharlesM on Sat Feb 08 21:56:17 MST 2014</STRONG><BR /><SPAN>I'm using a LPC1769 based LPCxpresso board. The LPC Link board is attached and no jumper connections have been severed or altered from the default factory configuration.</SPAN><BR /><BR /><SPAN>If I apply +5V from a 7805 regulator to pin J6-2 (EXT_POWX) of the LPC1769 board, what should be done with pin J6-28 (VIO_3V3X)? Do I need an additional 3.3V regulator to power VIO_3V3X as well, or can that pin be left open?</SPAN><BR /><BR /><SPAN>&lt;!--break--&gt;</SPAN><BR /><BR /><SPAN>The schematics indicate it is an input when the board is externally powered via EXT_POWX (as opposed to self-powered through USB), but I'm not sure how the attached LPC-Link board affects the VIO_3V3/VIO_3V3X signals.</SPAN></BODY></HTML> Wed, 15 Jun 2016 17:57:58 GMT https://community.nxp.com/t5/LPC-Microcontrollers/LPC1769-power-question/m-p/523038#M5674 lpcware 2016-06-15T17:57:58Z