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Original question:

TMS320F28335

TMS 320F28335

user4540868
Prodigy 55 points


If the power-on sequence is wrong, will it cause the boot pin level to be indeterminate? DSP can't enter flash operation normally? Will the DSP be damaged if the power-up sequence is not correct for a long time?Can the power-on sequence of the drawing be ok? Yellow is 3.3V, green is 1.9V.

  • 0
    TI__Guru* 95315 points

    If the power-on sequence is wrong, will it cause the boot pin level to be indeterminate? DSP can't enter flash operation normally?

    The boot-mode pins are read when the boot-ROM starts executing. This happens after the voltage rails have stabilized and the device is out of reset.

     

    Will the DSP be damaged if the power-up sequence is not correct for a long time?

    No risk of damage, as long as the voltage levels are kept within datasheet limits. The risk of not following the sequence is a glitch on the GPIO pins.

     

    Can the power-on sequence of the drawing be ok? Yellow is 3.3V, green is 1.9V.

    I see that both supplies are ramping together, which is per the datasheet guideline. However, I don’t understand how both supplies rise to 833 mV almost instantaneously (inside the red circle)

  • 0 in reply to Hareesh Janakiraman
    TI__Guru* 95315 points

    Closing thread due to inactivity.