Hi, [quote user="Zhiyuan Hu"] 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.[/quote] 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? [quote user="Zhiyuan Hu"]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.[/quote] 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
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