Hi,
When I plug in a 9VDC power source to my LPC-2148P development board, I am unsure if the power levels are ok. The LED lights up, but when I test the voltage at the power barrel port it reads to be about 3.58v. (When not connected and I test the voltage of the power connector, it reads to be 9.00v.) Is this normal? I decided to test the voltage regulator, and the output is around 1.6v (using sot223 tab as vout, and gnd from the power barrel) Is something defective? I haven’t tried to do anything else on this board yet but simply confirm the voltage is ok.
I know my voltage source is stable and it puts out 9VDC centerpositive, and can provide up to 1.5A current.
Thanks
~vsergeev
So now I’m using the 9VDC 300mA wallwart from sparkfun instead,
I try to “Read Device ID” in the LPC2000 Flash Utility after I connect the serial cable to the development board, but I never can seem to get it to work. I should also mention that the voltage regulator and lpc2148 chip seem to heat up pretty rapidly, to the point where it is too hot too touch (I unplug it then). I don’t think this is normal operation, is it?
The LPC2148 on my board doesn’t get hot at all, nor does the voltage regulator, even when running at 60 MHz.
My LPC2138 board was OK until I did a neat little mistake. I set the PLL incorecctly and then stpoped debugging. This was a bad thing to do! The over clocked LPC2138 proceeded to get quite warm while I was modifying my code. I should have removed power or RESET the board.
I am now writing a PLL function that will check the input paramaters and return an error code if the values used will harm the MCU.
Now I get to replace the MCU on my board :roll:
Well now I can no longer establish any comminications and the Power LED is lit up and things get warm. Just was wondering if this might have happened in your case also.
bertrik,
Yeah, then something is obviously wrong with mine. It heats up significantly. I’m going to get it replaced… 
Thanks for the responses by the way.