Pages: [1]   Go Down
Author Topic: Nano V3 useless over wide temperature range  (Read 711 times)
0 Members and 1 Guest are viewing this topic.
0
Offline Offline
Jr. Member
**
Karma: 0
Posts: 73
Arduino rocks
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

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.
Logged

Left Coast, CA (USA)
Offline Offline
Brattain Member
*****
Karma: 361
Posts: 17301
Measurement changes behavior
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

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
« Last Edit: March 16, 2014, 08:55:00 pm by retrolefty » Logged

0
Offline Offline
Jr. Member
**
Karma: 0
Posts: 73
Arduino rocks
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

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

Left Coast, CA (USA)
Offline Offline
Brattain Member
*****
Karma: 361
Posts: 17301
Measurement changes behavior
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

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.
Logged

0
Offline Offline
Jr. Member
**
Karma: 0
Posts: 73
Arduino rocks
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

Within 1%over 90C range.
Logged

Left Coast, CA (USA)
Offline Offline
Brattain Member
*****
Karma: 361
Posts: 17301
Measurement changes behavior
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

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
Logged

0
Offline Offline
Jr. Member
**
Karma: 0
Posts: 73
Arduino rocks
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

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

Left Coast, CA (USA)
Offline Offline
Brattain Member
*****
Karma: 361
Posts: 17301
Measurement changes behavior
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

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.

Logged

Global Moderator
Dallas
Offline Offline
Shannon Member
*****
Karma: 209
Posts: 13015
View Profile
WWW
 Bigger Bigger  Smaller Smaller  Reset Reset

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/
Logged

Pages: [1]   Go Up
Jump to: