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[SOLVED] Crystal Load Capacitor

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abhishek.2138

abhishek.2138

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For microcontroller crystal oscillator, as in below snap.
1676716671799.png


To calculate the load capacitance following formula is used -

1676716760076.png

where, Cs = PCB stray capacitance.

Now, here are Cx1 & Cx2 in series with each other? If they are in parallel, it will be Cx1 + Cx2.
Can anyone pls let me know about Cx1, Cx2 series combination & HOW they are in series ?
 

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Hi,

the loop of the resonance circuit is: GND --> CX1 --> XTAL --> CX2 --> GND

Cs is PCB stray capacitance + input capacitance of XTAL1

There are plenty of application notes around explaining the circuit. I guess every XTAL maunfacturer provides them for free and with very good quality. (Because they want to sell their XTALs)

Klaus
 
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