Static bits in UID (STM32F4)

danny · ‎2018-08-20

Hey! Does anyone have more info about the UID bits in STM32F4 processors. If I were to use only this processor, which bits could I eliminate from the UID to still have a unique ID for each device and the ID would be the smallest possible in size.

-Thanks

waclawek.jan · ‎2018-08-20

The UID consists of X and Y position of the given chip on the wafer, and a number representing the wafer number (this matches ST's manufacturing records). While these numbers concatenated are guaranteed to result in a unique 96-bit number, there's no subset of these bits which result in guaranteed unique number.

JW

Tesla DeLorean · ‎2018-08-20

Use a hash, or burn your own number in OTP

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