AVR-Chat

are ATMEL AVR micros more vulnerable to EMI than other
micros? what do you think? Or can the EMI problems be
addressed to circuit design & environment directly? A
elektronik circuit design firm in my country was using
atmel micros beside nec,mitsubishi,pic and the manager
had some complaints about atmel. He was happy with
mitsubishi in contrast.

--- Kathy Quinlan
<kat-yahoo@kaqelectronics.dyndns.org> wrote:
> 
> 
> > -----Original Message-----
> > From: JoeT [mailto:joet@attg.net] 
> > Sent: Wednesday, 11 February 2004 1:14 AM
> > To: AVR-Chat@yahoogroups.com
> > Subject: RE: [AVR-Chat] Relay Control
> > 
> > 
> > I was going to go for the PCB shielding next. It
> does not 
> > have a ground plane. I used a 10k a pull up
> resistor on int0, 
> > I'll try 1k. What is a "a snubber network on the
> contactor" ?
> > 
> > Thanx
> > JoeT
> 
> The opto isolator *should* provide the isolation
> from spikes, so the 10K
> is probably fine. I would suggest the problem is the
> EMI from the
> Contactors getting into the processor and triggering
> the Int0.
> 
> A snubber network is a cap and resistor placed
> across the contacts of
> the contactor (and also the drive relay) the
> function is to quench the
> arc drawn as the contacts open, this is achieved by
> the resistor and
> capacitor providing a path for the current to flow
> as the contacts open,
> the leakage current is not high, so the device being
> driven does not
> operate.
> 
> Any good electrical shop (industrial) should be able
> to sell you a
> snubber network in a signal package with two leads
> hanging out. IT will
> need to be selected to suit the load, but they may
> be able to help you.
> 
> Remember young Jedi ;o) google is your friend.
> 
> Regards,
> 
> Kat.
> 
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