topic Re: KL46Z - Burned MCU in Kinetis Microcontrollers

KL46Z - Burned MCU

igorlalik — Tue, 23 Dec 2014 11:48:37 GMT

I want to know why, when I charge KL46Z by battery 7,2V into pin P5-9V which has a stabilizator, my MCU burned !!?

Re: KL46Z - Burned MCU

Jorge_Gonzalez — Tue, 23 Dec 2014 18:37:50 GMT

Hello Igor:

What pin P5-9V are you referring to? Is this the J3[16] pin in the FRDM-KL46Z?

Regards!,
Jorge Gonzalez

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Re: KL46Z - Burned MCU

igorlalik — Tue, 23 Dec 2014 19:23:04 GMT

Hello Jorge!

Thanks for answer! Exactly, i used J3[16] pin to connect battery and on green board also was connected servo and 2 motors. I used it in that combination for 2 days and today i heard quik click and smell of burning element. I thought that was MCU, because it was very hot. Now when i charge board by USB, only MCU is getting hot and i can't flash program into board, because of error: No Debug Unit Device found. I don't know if that MCU is burned or something else. If you know what it might be please help :smileyhappy:

Regards!

Re: KL46Z - Burned MCU

Jorge_Gonzalez — Tue, 23 Dec 2014 20:12:57 GMT

Hello Igor:

You are right, sorry, my previous comment was misleading. U1 should indeed regulate the P5-9V input.

Your picture does not show the problem. It is strange that it was working for 2 days and suddenly crashed.

I am not familiar with the Freescale Cup board or the hardware connections, you may post your issue to the University Programs space.

Regards!

Jorge Gonzalez