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TMS320F28388D: Power sequencing

Renan Santos Adriano
Mastermind 20440 points
Part Number: TMS320F28388D

Hello Team,

I'd like to ask a question about the power-up sequence. In SPRSP14B in 5.8.1 this paragraph: 

"VDDIO and VDDA Requirements: The 3.3-V supplies VDDIO and VDDA should be powered up together
and kept within 0.3 V of each other during functional operation."
I'd like to ask how strict is this requirement. I mean can VDDIO ramps up first and VDDA rise 2ms later or both must be tight together all the time? Is it dangerous for the MCU?
Regards,
Renan
  • 0
    TI__Mastermind 28275 points

    Hi Renan,

    Powering up the 3.3v rails together is a strict requirement. You should tie all the 3.3v rails together and supply them from a single supply. If you are worried about noise coupling unto the VDDA rail, you can add a pi filter between VDDA and the other 3.3v rails.