Hi to all ,
Why the exposed pad is kept under the Crystal Oscillator?
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Exposed pads (EP) are usually to dissipate heat. You may note in any application description adding vias to the EP. For a crystal, its purpose may be slightly different, this is, to form an isothermal area. Are there the usual two connections for the crystal? I assume that to be the case.

 

Exposed pads (EP) are usually to dissipate heat. You may note in any application description adding vias to the EP. For a crystal, its purpose may be slightly different, this is, to form an isothermal area. Are there the usual two connections for the crystal? I assume that to be the case.

but i am told by somebody to suppress the noise .

 

Then why did you ask?

 

Then why did you ask?

just to confirm

 

If grounded, it might help with noise. Certainly the datasheet gives a recommendation, However, remember, crystals require just a tiny bit of noise to start. Have you ever had a crystal that needed a slight touch on the case to get it started? I have.

 

Thanks for your support .

 

Why the exposed pad is kept under the Crystal Oscillator?

Showing us what you're talking about is always helpful. Your definition of exposed pad might be different than mine.

 

thanks a lot.