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capacitances on crystal pins TJA1100 TR1329

Question asked by Jerome Herzog on Jun 22, 2016

Hi,

I have a questions related to the crystal capacitances shown in the TR1329.pdf on page 13. The crystal get to 15pF caps but why? If I look up some equations about the crystal design, there are some equ. where I can use the given manufacturer data, like the load capacitance.

With the given data I get 6pF for each crystal (Cstray considered).

So why are there two 15pF instead of the 6pF?

 

Thanks in advance.

Jerrry

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