MSP430FR5729: UBDIFG uncorrectable FRAM bit error errata (GC3)

Brian Rau

Part Number: MSP430FR5729

In a previous thread I asked about problems we were having with a small number of boards using the MSP430FR5729, where we were seeing UBDIFG SYSNMI interrupts regularly (uncorrectable FRAM bit error). Replacing the MSP430 on these boards appeared to fix the problem, so we were somewhat prepared to write this off as a possible ESD/handling issue. However, the problem is still occurring, and I see a number of similar issues documented on this forum. This got me digging back into the errata sheet (SLAZ382AH for our part), where errata GC3 documents that the UBDIG and CBDIFG error flags are incorrectly set after wakeup from LPM2+ modes, and presents a workaround.

So my question now is this: Is it possible that the bug described in errata GC3 for the MSP430FR5729 (and presumably similar errata for other parts) might only appear on some chips? If this only affects, say 5% or so of production parts, then that would fit well with what we (and apparently a lot of other folks) are seeing.

- BR

4 months ago

0 Sal Ye 4 months ago

TI__Genius 11135 points

Hi Brian,

I am afraid that I can not give you certain answer. According GC3, it uses a definite description, so it should appear in all cases. Is the workaround presented in ERRATA can solve your issue?

Also, I found this thread might be helpful for your reference:

https://e2e.ti.com/support/microcontrollers/msp-low-power-microcontrollers-group/msp430/f/msp-low-power-microcontroller-forum/825975/msp430fr5989-ubdifg-and-ubdrsten-gc5-errata

By the way, it seems that the issue is random for your product, and they were still functioning normally before the failure. So, what will happen if you re-program the IC and it still failed?

B.R.

Sal

0 Brian Rau 4 months ago in reply to Sal Ye

Prodigy 200 points

On a sample of one board showing the problem, implementing the GC3 work-around appears to have solved the problem. Obviously we need much more testing on a larger sample of problem boards.

The history of this is tricky, because the NMI trap for UBDIFG was only recently added to the firmware, and that's when we started seeing the problem, as boards were updated to the new firmware. If I had to guess, I'd say somewhere between 5-10% of boards are showing this issue; it's definitely more than 0%, and I think certainly less than 10%.

0 Sal Ye 4 months ago in reply to Brian Rau

TI__Genius 11135 points

Hi Brian,

OK, that sounds interested. Let‘s track the status of updated firmware and check whether the issue disappear.

B.R.

Sal

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MSP430FR5729: UBDIFG uncorrectable FRAM bit error errata (GC3)