Could you please clarify if you are looking for a specific datasheet, or perhaps a document related to the microcontroller released in 2021 ?
: The numbers "22" and "21" sometimes appear in mechanical specifications, such as the 51x21mm PCB dimensions for the Raspberry Pi Pico . Download Raspberry PiCM22nd21 pdf
: The most likely target if "CM" stands for Compute Module . Official datasheets for the Compute Module 4 and the newer Compute Module 5 Could you please clarify if you are looking