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MSP430FR6043: MSP430FR6043IPN unique device ID?

Tuomas Tissari
Prodigy 45 points
Part Number: MSP430FR6043
Other Parts Discussed in Thread: MSP430WARE

Tool/software:

Hi,

We'd like to implement a feature on MSP430FR6043IPN where we are able to read unique device ID from the mcu. We would prefer not having to assign an ID ourselves.

Intead, I'm looking at the Device Descriptor Table:



If we were to read the content of the registers for Low/Wafer ID, Die X Position and Die Y Position and concatenate them together, would this produce an unique string?

We are looking for a way to guarantee that no two units of the same MCU have the same ID.


Thank you for your ideas!

  • 0
    Expert 2050 points

    Look a little further down, and you will see there is a "Random Number" in the TLV which is 128 bits in length.

  • 0 in reply to Seth Jackson
    Prodigy 45 points

    Thank you for your suggestion. Indeed it seems the random number has very low probability of being repeated.

    Adding this here for whoever might bump into this post having the same question: My colleague was able to find a couple of posts on these forums regarding this. The conclusion for us is that TI will not guarantee unique numbers by using these methods, and instead GANG serialization (assigning a number) is recommended.

  • 0
    Prodigy 112 points

    Hello!

    I found 2 places which claim it should be "unique":

    • In slau367p (MSP430FR6043 MCU user guide) page 67 it's saying that the Tag Value 08h means "Unique Die Record".
    • In the latest MSP430Ware_3_80_14_01\driverlib\driverlib\MSP430FR5xx_6xx\tlv.h, the description for TLV_getDeviceType says "Retrieves the unique device ID from the TLV structure".

    Are these incorrect info?

    In a 7-years old MSP430F5438A: Chip identification post there is a claim from a TI representative that TI does not guarantee this uniqueness... but that was 7-years ago and for a flash-type device. Does TI still not guarantee the uniqueness for the newer FRAM devices (MSP430FR6043)?

    Thanks,

    Daniel

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