Dave VanHorn wrote:

>
>>
>> Then I talked to the another colleague in another division, he
>> told me that we have major issues with Atmel due to EMC and other
>> performance problem. So for high reliability product, they are
>> now considering Microchip in the low end and Renesas in the high end.
>
>
> I would like to know more about this, I've not hit any issues of this 
> nature.


As would I.  As an analog person who was forced into this digital 
jun..er stuff, it seems that the only times I have had issues of this 
sort were when I didn't use good design practices in the first place; 
e.g. at 0300 you discover that the 100 pieces of a zero crossing triac 
driver was actually 92, so you stuff a non zero crossing version into 
the hole during test and then have intermittent craziness when a motor 
starts.  But this would also be an issue in almost any circuit.  Atmel 
also has a good app note addressing EMC which is pretty good, albeit 
common sense.

EMC/RFI/EMI problems often get blamed on a chip when they are actually a 
result of design practices in my experience.  It doesn't make any 
difference if the system is PLC, microcontroller, discrete logic, or any 
other type we might want to name, the real world is noisy and we have to 
compensate for it.

REB


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