Roth Kalman

Cannot program MK64FN1M0M12. Reset problem.

Discussion created by Roth Kalman on May 15, 2017
Latest reply on May 19, 2017 by Pablo Baena

Hello everyone!

 

I have just produced a board which uses a MK64FN1M0VLQ12 chip.

The problem is that the chip's reset pin stays low after POR, and I cannot figure out how could I achive to pull its pin high.

The power supply of the chip seems to be ok, the reset pin is tighted through 1K resisitor towards positive rail, and through 100 nF cap to ground.

 

I am trying to probram my chip using FRDM-K64F board, but as soon I plug its SWD socket, the programmer's reset LED turns on, signing that the common reset line is low. So at this point I have no chance to program the chip.

 

I think I can rule out systematic hardware failure, the reset pin is not shorted toward ground, the power supplying shall be fine.

 

My question is, what can lead for this chip to hold its reset pin low?

 

Thank you in advance!

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