topic Lpcxpresso lpc1769 power problem in LPCXpresso IDE

Lpcxpresso lpc1769 power problem

lpcware — Thu, 16 Jun 2016 02:37:20 GMT

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 :

[IMG]https://dl.dropbox.com/u/16049803/sup.JPG[/IMG]

Waiting for ur quick replies :)

Thanx

Re: Lpcxpresso lpc1769 power problem

lpcware — Thu, 16 Jun 2016 02:37:21 GMT

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 :

[IMG]https://dl.dropbox.com/u/16049803/sup.JPG[/IMG]

Waiting for ur quick replies :)

Thanx

Hi..!!!

Can u send us the block diagram of the connection.

Thanks & Regards......:)

Re: Lpcxpresso lpc1769 power problem

lpcware — Thu, 16 Jun 2016 02:37:21 GMT

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 :/

[IMG]https://dl.dropbox.com/u/16049803/supblock.JPG[/IMG]

Re: Lpcxpresso lpc1769 power problem

lpcware — Thu, 16 Jun 2016 02:37:22 GMT

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.

Thank You