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MOD5234 clock stability
Posted: Tue May 11, 2010 10:29 am
by delcomb
Does anyone know the specs on the system clock for the MOD5234? We are using DMA timers to measure response time of electronic throttles and I'd like to know what are the stability numbers for the oscillator. Base accuracy, aging, and temperature characteristics would be useful.
Doug
Re: MOD5234 clock stability
Posted: Tue May 11, 2010 12:33 pm
by pbreed
The MOD5234 uses a pretty generic industrial temp crystal. So I'd guess somewhere near 100ppm in the real world.
If you have access to the internet you can start a 32 bit DMA timer and check that against an NTP server every few hours
if you really want to model the crystal frequency.... If your Mobile and have GPS, buse that time and a long term counter, or
bring down the GPS PPS and be more precise.
How good do you need to be? In general 90% of the time people start trying to model these things the cure is
worrse than the disease as it add all sorts of unanticipated failure modes.