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MSP430F5328: Power Sequencing

Darren (FAE)
Expert 5483 points
Part Number: MSP430F5328

Are there any power sequencing requirements, except for the requirement that AVCC / DVCC need to be within 0.3V of each other at all times? (power on/off and normal operation)

AVCCx / AVSSx, DVCCx/DVSSx, VCORE (just an external cap?), VSSU...?

  • 0
    TI__Mastermind 27505 points

    Hi Darren,

    The AVSSx, DVSSx and VSSU are all ground pins. 

    The VCORE usually uses the same power source with DVCCx. The only difference between them is the cap value. You can use the following figure as reference. 

    Best regards,

    Cash Hao

  • 0 in reply to Cash Hao11
    TI__Expert 5483 points

    Hi Hao,

    Just to clarify - for AVCC and DVCC, even if the device is held in reset, you still need to make sure the voltage is within 0.3V of each other at all times, right? 

    So if you hypothetically powered AVCC and DVCC from separate supplies, they would need to have the same rise/fall times, and be accurate over temp/process to within 0.3V of each other, right?

    There are no other startup/power-down, restart requirements specific to the power pins besides this, right?

  • 0 in reply to Darren (FAE)
    TI__Mastermind 27505 points

    Hi Darren,

    Yes, even if the device is held in reset, you still need to make sure the voltage is within 0.3V of each other at all time.

    In fact, the AVCC and DVCC also uses the same power source in most cases, the differences will be using different cap values on each pins.

    And you might need a bead or a resistance to separate the AVSS and DVSS. It all depends on your requirements.

    Best regards,

    Cash Hao

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