Hi longoal025，
Unfortunately, we don't have the directly PCA8561BHN sample code for your reference, but it is not complicated.
I don't know which kinetis you are using, you can us the SDK code SPI driver:
https://mcuxpresso.nxp.com/
then you need to refer to PCA8561BHN datasheet, send the related command is OK:
https://www.nxp.com/docs/en/data-sheet/PCA8561.pdf
You also can search it from the website:
https://bbs.elecfans.com/jishu_949427_1_1.html
It can give you some inclues.
Wish it helps you!
If you still have questions about it, please kindly let me know!
Best Regards,
Kerry
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