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Basic Electronics » 32kHz clock

March 27, 2011
by Mujda
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I'm trying to work out if running an Atmega168 using an external 32kHz crystal required the 20pF capacitors on each side (on PCB - not breadboard). I find the datasheet ambiguous, it only states the capacitor values at higher frequencies. I know the use of the capacitors is to ensure it starts up reliably.

March 28, 2011
by Rick_S
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The datasheet for the crystal should be able to provide what they recommend for the capacitors. Most I've seen range around 15pF - 22pF.

Rick

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