AnsweredAssumed Answered

Burnt two MK60FN1M0VLQ12 when plug in USB port

Question asked by kakiayam on Oct 23, 2012
Latest reply on Jun 3, 2014 by Bob Paddock

Dear all,

 

I have connected the USB pins to the connector as detail in the image. But I burn the uC everytime I connect the USB port to a computer (host). I do not know what went wrong. As far as I am concern the uC needed the incoming Vbus 5V and regulate into the proper Vout to power the internal USB module of the uC.

 

But the problem was resolve when I replace the F8 ferrite bead with a 30R resistor. But I don't think this will solve the problem. Currently, I am not using the VOUT33 so loading at the output is not an issue. Was it due to the value of C32? The datasheet recommends a much larger cap (2uF), but surely, a lower cap should not cause it to load.

 

Please help and enlighten me on this. Thank you.

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