This is a question regarding STM32 crystal and Load CAP(2)

Data for the parts used are shown in the photo above.

I made the calculation as above, but I am curious as to whether I obtained the CL value correctly.

result)

→ECS-.327-12.5-12R-C-TR (32.768kHz CLoad 12.5pF, Cs 5pF)

CL1=CL2=(CLoad-Cs)*2=(12.5pF - 5pF)*2

CL1, CL2 →15pF (14~16pF)

→ECS-120-8-36-CKM-TR (12Mhz CLoad 8pF, Cs 5pF)

CL1=CL2=(CLoad-Cs)*2=(8pF - 5pF)*2

CL1, CL2 →6pF(5~7pF)

This topic has been closed for replies.

Super User

Best to keep the discussion in a single thread. You can reply to your other post to add more details as needed:

ST Employee

we need to consider the track capacitors from crystal to MCU.

in this case the CL1 and CL2 value is less than your calculation.

anyway, the test accuracy is important when you get the board.

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