Giving 5V DC to LPCxpresso Board

[lpcware]

Content originally posted in LPCWare by shaileshbc on Mon Aug 08 00:35:00 MST 2011
Dear All,
i want to know if i give 5V Dc supply to 2 pin of J6 connector, then
whether it will work ?
as there is no converter for 5V to 3.3V on target side of LPCXpresso 1769 board
i fear that if i give 5v supply, it will damage the board.
regards
Shailesh

[lpcware]

Content originally posted in LPCWare by Ex-Zero on Fri Nov 25 04:56:26 MST 2011
I'm not sure what we are talking about :rolleyes:

Are we talking about a separated LC1343 board? There you've to connect J6-28 with 3.3V and J6-1 with Ground :)

[lpcware]

Content originally posted in LPCWare by malay0345 on Fri Nov 25 01:34:40 MST 2011
Sir,
     I want to external power suuply only to lpc 1343 not by pc how to do it can u guide me??

[lpcware]

Content originally posted in LPCWare by Ex-Zero on Mon Oct 31 05:55:13 MST 2011

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Quote:

I'd like to resolve some similar doubts.
After unplugging USB Link Cable from unsplitted board my target LPC1343 has no power supply.

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No doubt :rolleyes:

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Quote:

On my PCB I make 3.3V using LM2574N-3.3 and its output is connected to 3V3 (J6-28) pin, so on other ICs on my board like EEPROM or LED driver. I have also GND pins (J6-1 and J6-54) wired to global PCB ground.
No other connections are required (like +5VIN), am I correct?

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What's that '+5VIN'  :confused: Input of voltage regulator ?
If you provide your own voltage regulator you just have to connect its regulated output to 3V3 somewhere :)

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Quote:

What if I plug in USB cable to Link? Its diodes would save it from multiple 3.3V powering issues, right?

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Yes :eek:

[lpcware]

Content originally posted in LPCWare by jakubko on Mon Oct 31 05:27:25 MST 2011
I'd like to resolve some similar doubts.

After unplugging USB Link Cable from unsplitted board my target LPC1343 has no power supply.

On my PCB I make 3.3V using LM2574N-3.3 and its output is connected to 3V3 (J6-28) pin, so on other ICs on my board like EEPROM or LED driver. I have also GND pins (J6-1 and J6-54) wired to global PCB ground.

No other connections are required (like +5VIN), am I correct?

What if I plug in USB cable to Link? Its diodes would save it from multiple 3.3V powering issues, right?

[lpcware]

Content originally posted in LPCWare by Ex-Zero on Mon Aug 08 02:24:45 MST 2011
You can supply your (non separated LPCXpresso) via USB (of LPC-Link) or 5V at VIN (J6-2) [COLOR=Red]or both[/COLOR].
There are diodes included so that's impossible to damage your board if USB and VIN are powered.

[lpcware]

Content originally posted in LPCWare by shaileshbc on Mon Aug 08 02:08:01 MST 2011
Dear Zero,
whether that means, if i am not connecting usb cable to pc and giving 5v power supply to J6->2 pin. it should regulate it to 3.3 volt (regulator available on lpclink board)
and LPC1769 will get 3.3 volt only, and board will not get damage.
regards
Shailesh

[lpcware]

Content originally posted in LPCWare by Ex-Zero on Mon Aug 08 00:52:57 MST 2011
If LPC-Link and target board are connected, J6-2 (VIN) is connected via J4 to a voltage regulator on LPC-Link.
If they are separated, VIN isn't connected to anything (and your separated target board isn't powered).
So you can't damage your board with 5V at VIN (separated or not).  

See schematic:

http://www.embeddedartists.com/sites/default/files/docs/schematics/LPCXpressoLPC1769revB.pdf