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MKW41Z - Debugger disconnects when VDD1P8 is increased

Question asked by Alexandru Stefan on Jan 17, 2020
Latest reply on Feb 28, 2020 by Alexandru Stefan



I'm running a custom board with MKW41Z on it, powered from 3V3. In my hardware initialization routine (inspired from the FRDM-MKW41 examples), I'm increasing the output voltage of the built-in DC regulator from 1.8V to 2.6V. When that change takes effect, the board continues to run as expected, but the debugger (an LPCXpresso LPCLink 2) disconnects and the IDE (MCUXpresso 10.2.1)  throws an error and the debug session stops. The board continues to function as expected. Then I have to reset the board a couple of times until I'm able to erase the flash and reconnect with the debugger.