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Ceramic resonator vs. Quartz crystal for arduino? Answered


Hey- I'm going to build some Arduino clones (as posted from http://fritzing.org/projects/barebones-arduino/ ) and was wondering if it would be better to use a crystal or a ceramic resonator. i will be ordering from Tayda Electronics (Ive ordered before, 10 days shipping for rock bottom prices, I'm ok with that) and the resonators and crystals are +-5c. difference, so I was wondering if I could use resonators, since they are a bit cheaper and I'm ordering a few (around 8). Which ones would be better? Also, does anyone know for the circuit from the above link would work with a 4.5v supply if I just left out the 5v regulator?

Many thanks- Astroboy907

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steveastrouk

Best Answer 7 years ago

Use crystals, unless you are stuck for space and/or you can accept the higher drift characteristics and you are making 20,000,000 of them,

Typically, the capacitors used with a crystal are 22..33pF, but the crystal data and processor data should be checked.

Steve

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Re-design

7 years ago

In my experience, yours may be different,

Quartz crystals have two leads ceramic resonators have 3 or if they have two you must add 2 capacitors to make the work, making them three lead parts.

Ceramic resonators don't have nearly as close a tolerance as crystals have and in any use where frequency control is important they are less useful.

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astroboy907Re-design

Answer 7 years ago

so i should use quartz? do i have to use the caps with the circuit i have? almost done, i made most of my order, hoping to get this ordered within a few days too

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frollardastroboy907

Answer 7 years ago

Again

Quartz = needs capacitors to 'start' the cycles= costs a few more cents, but are MUCH more accurate

Ceramic = will make it run, but don't expect any time-critical operations to be stellar (high speed communications, time measurement)


BOTH will be affected by temperature, but I forget which is more susceptible.

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astroboy907steveastrouk

Answer 7 years ago

how would i determine the correct cap values? i dont have any fancy measuring system to help determine...

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steveastroukastroboy907

Answer 7 years ago

It usually tells you in the data sheet. Typically, they are between 22 and 33pF.

Steve

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astroboy907steveastrouk

Answer 7 years ago

It took me a while but i tracked down the part on digikey (or at least one very close to it). heres a link to the included datasheet (http://www.citizencrystal.com/images/pdf/m-hc49us.pdf)
Says 18pf :)
im just using atmega 328s from sparkfun (both bootloaded and non, but i will be burning bootloaders onto the chips)