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TMS320F280049: What will happen if VDDIO/VDD is not well connected?

Julia Li
Expert 4385 points
Part Number: TMS320F280049

Hi Champs,

VDD, VDDIO and VSS each have 4 pins, usually all 4 pins will be connected to the correct voltage and GND. I noticed that if VDDIO/VDD voltage is below the minimum voltage it will cause a BOR/POR. If one of  VDDIO/VDD is not well connected and other 3 pin is well, not all 4 pins' voltage is not enough, what will happen? Will it cause the BOR/POR or something else? Thanks!

Best regadrs,

Julia 

  • 0
    TI__Mastermind 30185 points

    Hello Julia,

    I've assigned this to an expert, but as they are currently on travel there may be extended delays between responses.

    Best regards,

    Omer Amir

  • +1
    TI__Guru* 95315 points

    Julia,

                  For proper device operation, all supply and GND pins need to be connected appropriately. In other words, no supply or GND pin should be left unconnected. Exactly what would happen if this directive is not followed is extremely difficult to predict. It depends on what exactly the device is doing and hence what the current distribution is among the supply pins. Note that the current draw is not a smooth DC but a pulsating DC, owing to the switching happening inside the device all the time. Therefore, even though the supply pins are all connected inside the device, parasitics come into the picture due to which there could be localized voltage drops. BOR reset is a possibility but there is a possibility of logic malfunction as well.