LPC824 from external power source

essamnamouz — Mon, 24 Jul 2017 19:51:58 GMT

I am trying to power the LPC824 Xpresso v2 board using an external power supply instead of powering from USB. I can use USB for power while programming, but then I want to be able to run it without the USB plugged in after it is programmed.

It is not clear where and how much voltage I supply. I tried 5V to the Vin pin but that did not work. The built in LED came on, but no firmware was running. When I disconnected this and provided power via USB it works fine again.

Re: LPC824 from external power source

jeremyzhou — Wed, 26 Jul 2017 02:12:42 GMT

Hi essamnamouz,

Thank you for your interest in NXP Semiconductor products and

for the opportunity to serve you.

According to datasheet, you can find that the VCC level can't exceed the 4.6 V (Fig 1), and on the LPC824 Xpresso v2 board, it integrates the voltage-transferring circuit which is used to output the 3.3 V from the feeding 5V.

Have a great day,

TIC

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