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msp430f1232 storage temperature question

Zhiyuan Hu
Genius 9845 points
Other Parts Discussed in Thread: MSP430F1232, MSP430F2232, MSP430F2252

Hi Team,

msp430f1232 datasheet specifies storage temperature -55degC to 150degC for unprogrammed device, and -40degC to 85degC for programmed device. This 85degC limit is troublesome for customer.

Why does programmed device must have lower storage temperature than unprogrammed device? Is it because Flash's data retention duration will reduce at >85 degC? If so, how much is the impact? Datasheet says data retention duration is 100 years at 25 degC. If it can do 10 years at 125 degC, it is still good enough for many applications.

Please help elaborate. Thank you very much!

Regards

Zhiyuan 

  • 0
    TI__Mastermind 49692 points

    Hi,

    Zhiyuan Hu said:
    msp430f1232 datasheet specifies storage temperature -55degC to 150degC for unprogrammed device, and -40degC to 85degC for programmed device. This 85degC limit is troublesome for customer.

    If this is troublesome for the customer, have they considered similar, alternative parts, such as the MSP430F2232 or the MSP430F2252, which offer versions that can handle up to 150C (unprogrammed or programmed) according to their datasheets?

    Zhiyuan Hu said:
    Why does programmed device must have lower storage temperature than unprogrammed device? Is it because Flash's data retention duration will reduce at >85 degC? If so, how much is the impact? Datasheet says data retention duration is 100 years at 25 degC. If it can do 10 years at 125 degC, it is still good enough for many applications.

    Please read through the Understanding MSP430 Flash Data Retention app note. It discusses how we perform accelerated tests to predict data retention. Please note that these tests are wholly based on Arrhenius law and equation. As you can see in Figures 1 and 2, when temperature increases, the number of years of data retention decrease substantially (and definitely not linearly). How long the device should last is application-specific and should be based on the end customer's requirements.

    Regards,

    James

    MSP Customer Applications

  • 0 in reply to James Evans
    TI__Genius 9845 points
    Hi James,

    Thank you very much for your reply.

    Figure 1 shows that the data retention period will reduce with temperature increase. But how about data retention period with temperature decrease? Why is the minimum storage temperature -40 degC for programmed device, and -55 degC for unprogrammed device? It appears to be customer's concern as there are places on earth that experience colder than -40 degC environment in a year.

    Thank you very much again for your help!

    Regards,
    Zhiyuan
  • 0 in reply to Zhiyuan Hu
    Guru 243140 points
    As far as I know, low temperatures do not decrease data retention, but make erase/write operations fail. So in theory, the minimum storage temperature should not be any higher.

    It's possible that lower temperatures simply were not tested at all for programmed devices.
  • 0 in reply to Clemens Ladisch
    TI__Genius 9845 points

    Hi Clemens,

    Thank you very much for your answer. 

    Could you please clarify that, whether low temperature can cause erase/write operation to permanently  fail even after bringing up temperature to above -40degC?

    If it is not the case, can we store programmed devices at -55degC, and only operate it at above -40degC? 

    Thank you very much.

    Zhiyuan 

  • 0 in reply to Zhiyuan Hu
    Guru 243140 points
    This applies to the temperature at the time the erase/write operation actually happens.

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