https://www.st.com/resource/en/technical_note/tn1433-reference-device-marking-schematics-for-stm32-microcontrollers-and-microprocessors-stmicroelectronics.pdf
Nice; however, these marking schemes tend to change over time and with changing packaging sites. I wonder how long will it take the new QR-style marking to propagate into this document... :)
JW
