LPC2478 board and current consumption
Technical Note 19623
11/6/2015 10:35 AM
This Technical Note applies to IAR Systems KickStart Kit for NXP Semiconductors’ LPC2478.
Debugging with the LPC2478 board fails. For example, the 'J-Link Control Panel' shows a failure for overcurrent in the 'Target Power' tab.
The LCD mounted on one batch of the LPC2478 board use too much power due to increased backlight. This will in turn use too much power for the debug probe to be able to power-up the board.
Use an external power adapter. Change position of EXT/JLINK jumper to EXT (pin 2-3 closed) in the lower right corner. The power input should be +(9-12V DC) / 6V AC.
Solution by modifying the board
It is also possible to change R22 from 1 Ohm to 2.2 Ohm, picture below. (Note that such a change ends the warranty of the board.)
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