The series has high reliability and is available
for a wide temperature range.
Oscillation circuits do not require external load
capacitors.
The series is available in a wide frequency range.
The resonators are extremely small and have a low
profile.
No adjustment is necessary for oscillation circuits.
Does number 2 above suggest that I can just plug this in to the xtal1 and xtal2 without putting on those two little 22pF capacitors from each pin to ground as shown below?
Keep in mind that the device you linked to in your first post is a ceramic resonator not a quartz crystal resonator and while both are made of a crystalline structure there is basic differences in their performances especially frequency accuracy and stability. Ceramic resonators come in both two terminal versions and three terminal versions, where the three terminal models included the needed 'padding capacitors' internally installed inside the package, while the two terminal models would still require external padding caps just like the two terminal quartz crystal resonators do.
Yeah, those resonators have built-in caps, as the guys say. Unfortunately, and I do mean
UNFORTUNATELY, I only discovered on another forum a couple of days ago, that the UNO
boards use such resonators instead of crystals.
This means all of the Arduino timing and frequency operations have "large" [subjective
measure] errors, due to the 0.5% tolerance of the resonators. This can mean 432 seconds
error per day in timing. That amounts to 300-msec error per "minute". OTOH, real crystals
have 20-50 PPM tolerance, so 1.7-4.3 sec error per day.
oric_dan(333):
I just don't see the point in using resonators.
Are they cheaper?
I think ceramic resonators are a little cheaper at full suggested retail from manufactures, but really I've found some small retailers selling 16Mhz crystals for a dime:
jerseyguy1996:
I just need it to be accurate enough to handle UART communication. Will this work?
Yes, ceramic resonators are accurate enough for UART timing. I routinely use 3-terminal ceramic resonators in my designs, except when I need greater accuracy.
oric_dan(333):
I only discovered on another forum a couple of days ago, that the UNO
boards use such resonators instead of crystals.
I'm surprised by that. I thought the UNO used external crystals.
If my memory serves me right I think the very first version of the Uno board did ship with a crystal for the AVR chip. But I can't find any links to the older Uno schematic drawings in the product page, only the current R3 version.
dc42:
Yes, ceramic resonators are accurate enough for UART timing. I routinely use 3-terminal ceramic resonators in my designs, except when I need greater accuracy.
