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Topic: Nano V3 useless over wide temperature range (Read 898 times) previous topic - next topic

maxmike

I find it amazing that in order to save 2cents on a crystal they are still building the Nano V3
with a resonator. That makes it useless for accuracy over outside temperature ranges of from
-40C to +50C. Too bad, it's a good form factor for embedded systems, but even the Chinese
who copied it are doing the same thing.

retrolefty

#1
Mar 17, 2014, 02:53 am Last Edit: Mar 17, 2014, 02:55 am by retrolefty Reason: 1

I find it amazing that in order to save 2cents on a crystal they are still building the Nano V3
with a resonator. That makes it useless for accuracy over outside temperature ranges of from
-40C to +50C. Too bad, it's a good form factor for embedded systems, but even the Chinese
who copied it are doing the same thing.


Funny part is the original Nano (V2.3?) used a real crystal. You do know that the existing Uno and Mega boards also use ceramic resonators? What specific accuracy and stability values do you require? Might there be another way to compensate or calibrate for your specific project? What are you building?

http://arduino.cc/en/uploads/Main/ArduinoNanoManual23.pdf

maxmike

I need to keep a 1 khz square wave stable. Sure, I can add a thermostat but it's not cost efficient.

retrolefty


I need to keep a 1 khz square wave stable. Sure, I can add a thermostat but it's not cost efficient.



"Stable" is not a specific specification, only a hint at one.

maxmike


retrolefty


Within 1%over 90C range.

That's 10,000 PPM (parts per million)

Below is a typical ceramic resonator datasheet. Shows +/- .3% over temp range, so better then your requirement?

http://www.ecsxtal.com/store/pdf/zttr.pdf

maxmike

A crystal is a crystal, but one resonator is not the same as another - is your spec the one they are using? Probably not.

retrolefty


A crystal is a crystal, but one resonator is not the same as another - is your spec the one they are using? Probably not.


Not all crystals are equal just as not all ceramic resonators are equal. I just posted an example of just one ceramic but only you know what you proposing to use and if it meets your requirements or not. I just wanted to see if you were attempting an objective decision or more of a subjective one. Again the Uno and Mega both use ceramic resonators and that doesn't seem to have 'crippled' those boards from being useful for a lot of people.


Coding Badly

Too bad, it's a good form factor for embedded systems...


A better form factor.  With more memory.  And other goodies.  At a reasonable price.  With a crystal.
https://www.pjrc.com/teensy/

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