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I am running my arduino project with the atmega328 chip like this:

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I have purchased by mistake this crystal:

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The reason why I purchased by mistake that crystal was because it has this description:

16MHz ±10ppm 22pF 60Ω SMD-3225 SMD Crystal Resonators RoHS

I thought that it contained the 22pF ceramic capacitors inside. But latter I learned that I still the 22pf ceramic capacitors. (Please correct me if I am wrong)

Anyways how can I use that crystal? I only know how to connect the 2 pin crystal. Since this crystal has 4 pins now I am confused.

To me it makes sense to connect it like this:

  1. Connect pins 9 and 10 from atmega --TO--> pins 1 and 3 from the crystal.
  2. Connect pins 2 and 4 from crystal --TO--> Ground
  3. Connect the 22pf ceramic capacitors to pins 1 and 3 from crystal and ground like in the first diagram.
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this is a nice question. Once for a project I stumbled upon this problem too.

The way you described the connection should work perfectly fine.

To me it makes sense to connect it like this: Connect pins 9 and 10 from atmega --TO--> pins 1 and 3 from the crystal. Connect pins 2 and 4 from crystal --TO--> Ground Connect the 22pf ceramic capacitors to pins 1 and 3 from crystal and ground like in the first diagram.

Keep it going and greetings from Switzerland.

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