SiT9121 Differential Oscillator.
Created by: awygle
This PR adds the symbol for the SiT9121 differential oscillator, 3.2mmx2.5mm variant.
Footprint PR can be found at https://github.com/KiCad/kicad-footprints/pull/1260.
I followed the lead of the other oscillator symbols here and made this a generic symbol, although the footprint specified is the 3.2mm by 2.5mm variant. I'm not really sure how this is intended to work, but I just did what everybody else seemed to be doing.
Datasheet: https://www.sitime.com/datasheet/SiT9121
P.S. the Python script yelled at me so I made the pin text spacing 20 instead of 40, which doesn't match a single other oscillator symbol as far as I can tell. I'll revert this if you like, or I'll make the change for all the other symbols if you prefer that - the inconsistency annoyed me only marginally less than being wrong.
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Provide a URL to a datasheet for the symbol(s) you are contributing -
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Ensure that the associated footprints match the official footprint library -
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