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MSP430G2403: Power off sequence

Kento Sato
Intellectual 890 points
Part Number: MSP430G2403

Hi team,

I have questions on power off sequence of MSP430G2403IPW28R.

- Do you have time limit to power off, like less than 10 ms?

- Do you have specific power off sequence, for example, power off after stopping main clock?

The backgruond of these questions is when customer uses MSP430G2403IPW28R in their board, somtimes MSP430 flash is deleted.

Thier usecase is 3.3V, 12MHz.

Could you please answer above 2 questions and give us your insight on solution?

Best regards,

Kento

  • 0
    TI__Mastermind 28526 points

    Hi Kento,

    I don't think this issue is cause by power off speed or sequence, maybe you need check if there are some flash operation, like flash write action in customer code.

    If yes, maybe you need to check if the voltage and power supply current over spec when operate flash:

    A quick method, maybe you can try to disable flash operation in customer code.

    If there are no any flash operation in customer code, maybe you have to check power supply(or other pin) if high than 3.6V in some corner condition.

    Thanks!

    Best Regards

    Johnson

  • 0 in reply to Johnson He
    TI__Intellectual 890 points

    Hi Johnson,

    The cureent customer situatoin is they have flash deleted just by turning power on/off. They don't input more than 3.6V.

    And they are worried about keeping under 2.2V for 10~100ms like below picture.

    Could you please let me know what it looks problem?

    Best regards,

    Kento

  • 0 in reply to Kento Sato
    TI__Mastermind 28526 points

    Hi Kento,

    I checked the datasheet, I don't think this will result in this issue when powe equal 2.2V with about 100ms. Just some concern that if there are some flash operation, like program, in this periods.

    Have you try decrease this 100ms time and test again?

    Thansk!

    Best Regards

    Johnson

  • 0 in reply to Johnson He
    TI__Intellectual 890 points

    Hi Johnson, 

    They don't have any flash operation in this term. I'll ask customer to try decrease 2.2V time.

    Best regards,

    Kento

  • 0 in reply to Kento Sato
    TI__Mastermind 28526 points

    Hi Kenth,

    Do we have futher test result that reduce 2.2V time?

    Thanks!

    Best Regards

    Johnson

  • 0 in reply to Johnson He
    TI__Intellectual 890 points

    Hi Johnson,

    With shortening 2.2V time, they didn't have this issue. Please find an attached file on detail. Left side on the file is before change, right is  after. Also 3 GPIO shows below. 

    Green: Power SW in via GPIO and Hi means ON

    Blue: Hi means leaving Power SW

    Red: In Flash erase function, Hi

    In erase function, it's 1.9V, Do you think it was the reason to erase?

    And what should they do to improve?   

     Best regards,

    Kento

    MSP430G2403IPW28R_Flash deleted.xlsx

  • 0 in reply to Kento Sato
    TI__Mastermind 28526 points

    Hi Kenth,

    The flash operation volateg have to high than 2.2V, I think there will encounter some issue if erase flash with 1.9V, this is over spec.

    Kento Sato said:
    In erase function, it's 1.9V, Do you think it was the reason to erase?

    We have to ensure flash operation voltage high than 2.2v to avoid this issue, why the voltage too low?

    In download image periode, I think we shoudl use a LDO to keep a stable volatge, correct?

    Thanks!

    Best Regards

    Johnson

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