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MSP430F147: Datasheet change and power-up failures at 8MHz

Felix Risch25
Intellectual 1110 points
Part Number: MSP430F147

Hi team,

my customer is using the MSP430F147 and hava a few questions about it:

The datasheet SLAS242F shows the representation of the supply Voltage and the frequency. Now at the new datasheet the Figure 5-1 has changed.

SLAS272F


SLAS272G/H


What has the component been changed? That now it is possible to set the Supply Voltage at 3.2V and the frequency at 8MHz?

We have the problem that the MSP430F147 is supplied with 3.3V and with an 8MHz crystal. There are some times failures at power-up. If we change the clock rate to 4MHz, there are no problems.

At the datasheet is no revision History why this has changed. Why it is changed at the datasheet?

Thank you and kind regards,

Felix


  • 0
    TI__Mastermind 49692 points
    Hello Felix,

    I see what you mean. I doubt that the device has changed, but perhaps the documentation needed to be updated or was somehow incorrect initially. Looking at the arrows in the new Figure 5-1, I suspect that the middle arrow should be pointing from the right-hand note, since the area with lines indicates that the flash memory can be BOTH programmed and executed at supply voltages between 2.7V and 3.6V.

    I'm sorry that you're having an issue running at 8MHz with a supply voltage of 3.2V. According to the absolute maximums and Figure 5-1, 3.3V should be adequate for 8MHz operation. Have you had a chance to confirm that the supply voltage never drops below 3.2V during startup and normal operation? Perhaps at startup, the inrush current dips below 3.2V temporarily. I'll see if I can find anything out internally that would trigger this updated Figure.

    I do see in the datasheet's Revision history that NOTE 2 in Section 5.3 (same section where Figure 5-1 is found) was a duplicate and was removed. Looking at the older revision, was there anything in NOTE 2 related to the operating frequency and supply voltage?

    Regards,

    James

    MSP Customer Applications
  • 0 in reply to James Evans
    TI__Intellectual 1110 points

    Hello James,

    I got a reply from the customer regarding the datasheet change.

    They are using the 1xx family since day one and they know that there is some kind of weakness in this series, which was fixed in the 2xx family. Now their own customer is telling them that accordingly to the datasheet the device should work.

    Can you check why the datasheet was changed and maybe update the datasheet accordingly?

    Kind regards,

    Felix

  • 0 in reply to Felix Risch25
    TI__Mastermind 49692 points
    Hello Felix,

    Thanks for the update. I've filed a bug internally, but I don't know when to expect a reply. If I hear anything, I'll let you know. In the meantime, I'll mark the thread "TI Thinks Resolved".

    Regards,

    James

    MSP Customer Applications

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