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MSP430F2619S-HT problem coming out of low power modes at elevated ambient temperatures

Roman Robles
Prodigy 30 points
Other Parts Discussed in Thread: MSP430F2619S-HT, MSP430F2619

I'm trying to design the MSP430F2619S-HT into a project where the device will need to run at its rated maximum ambient temperature (and perhaps, briefly beyond).   Colleagues report having had problems getting this processor to reliably exit low power modes at elevated ambient temperatures.  

I can find nothing similar to this issue in the May 2011 errata sheets for the MSP430F2619, so I'm wondering if it was only an issue in very early silicon (prior to Rev.H) or if it is only an issue with the -HT version.

1.  Has anyone else observed an issue with exiting a low power mode at high temperatures (on any version)?

2.  Would you expect the DCO to have trouble as temperature rises?  From past experiences, some device PLL's seem to struggle as ambient temperatures rise.

3. If not the DCO, what would you expect to be the first item to fail on this device as ambient approaches (or passes) 150C?

We have no misgivings regarding the impact of elevated temperatures on the device life span.  It has to function correctly, but its life is measured in days, not years.   

Thanks in advance for any opinions or guidance.

 

  • 0
    Guru 227245 points

    Roman Robles said:
    Would you expect the DCO to have trouble as temperature rises

    The DCO has a relatively high temperature drift. If it was programmed for maximum speed before going into LPM, i tmight wakeup with a too-high frequency after heating up.
    Also, there might be overshooting problems when DCO is re-enabled (see errata sheet of your device).
    The DCO does not have a PLL. There are problems with the FLL on 4x/5x devices if you just wakeup for a short ISR and the FLL is active. But the 2x sereis doe snot have an FLL.

    Roman Robles said:
    what would you expect to be the first item to fail on this device as ambient approaches (or passes) 150C?

    Generally, current consumption goes up on high temperatures. It might be possible that flash or the CPU core has trouble to run at maximum speed on this temperature. But actually I can just guess. Maybe you'll have to rise VCC a bit to keep it stable.
    The non-HT version is specified for 85°C, which is way more suitable for not gettign into trouble with junction overtemperature effects. 150C is already near what a typical CMOS junction can bear. Going beyond it will turn the diodes/transistors into more or less plain resistors, no longer functioning as intended. It will reduce lifespan, but primarily it will cease functioning as long as this temperature continues.

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