Content originally posted in LPCWare by ranaya on Wed Jun 27 22:21:58 MST 2012 Hi...
I got something strange when powering the xpresso board with an external supply. My analog circuit has a 5v regulator. I connected the 5v pin to VIN (EXT_POW) of the xpresso 1769 board(pin2). 2 LEDs (LED2 and another 1) start to blink continuously. But when I connect the USB cable 5v (VBUS) blinking dosent happen. What could be the reason ? Is it ok to supply regulator 5v to VIN ?? This is my schematic :
Content originally posted in LPCWare by ranaya on Thu Jun 28 00:01:40 MST 2012 Sorry, It was my series diode. Required power is not at the VIN pin cuz of the voltage drop.
Content originally posted in LPCWare by ranaya on Wed Jun 27 23:30:17 MST 2012 Hi Mr..
This is my block diagram. I use single regulator for both xpresso board and Mux supplies. And I checked the board using separate regulator. Still 2 LEDs blink continuously. When i power the board with USB bus supply no blinking there. What these 2 LEDs indicate here ? I'm bit scare about my board :/
Content originally posted in LPCWare by researchinnovation on Wed Jun 27 22:42:09 MST 2012 Quote: ranaya Hi...
I got something strange when powering the xpresso board with an external supply. My analog circuit has a 5v regulator. I connected the 5v pin to VIN (EXT_POW) of the xpresso 1769 board(pin2). 2 LEDs (LED2 and another 1) start to blink continuously. But when I connect the USB cable 5v (VBUS) blinking dosent happen. What could be the reason ? Is it ok to supply regulator 5v to VIN ?? This is my schematic :
