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many component failure with MC9s12xs128

Question asked by huguesangelis on Jan 19, 2015
Latest reply on Jan 19, 2015 by takaoyamada

Hi all. I'm a teacher in a french university

 

Well it's been a couple year since I did a project board for my students using a MC9s12xs128.

 

I am experiencing a recuring hardware failure without having any explanation to give to my techs (witch repairs too often my students boards).

 

Here is a link to the schematics of the boards : MicroB12 (the MCU board) and XBoard (the connection board).

 

We are using both P&E USB BDM multilink (and I suspect them to be part of the problem) and (home made) TBDML.

 

Symptoms are : suddenly the RESET led on µB12 start blinking, 5V voltage power start fail to established (going hi to low and low to hi, at the same speed as reset led) and of course, the MCU overheat.

When I replace the µB12 board there is no longer any problem and everythings works properly. This problem happends most of the time with P&E programmer.

 

Does anyone experience such problem and does anyone got an idea of the way to solve it ?

 

Thanks to all

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