NerdKits - 32kHz clock (Basic Electronics)

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Basic Electronics » 32kHz clock

NerdKits » Forums » Basic Electronics » 32kHz clock (2 posts)

March 27, 2011 by Mujda	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	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

March 27, 2011
by Mujda
Mujda's Avatar

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

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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