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TMS320F280049-Q1: Errata: VDD Supply: During VDDIO Power Up, VDD May Also Rise

Wilson Pang
Intellectual 590 points
Part Number: TMS320F280049-Q1


hi Sir/Miss,

Will this errata also cause leakage current to flow from VDDIO to VREFHIx pins?

At steady state, without supplying any voltage to VREFHIx pins, I observed that VREFHIx voltage will rise to about 1.6V~1.8V range.

If the Micro is being reset (XRSn = LOW), VREFHIx pins voltage will drop to about 0.7V.

  • 0
    TI__Genius 15385 points

    Hi,

    No, their should not be any leakage current between VDDIO and VREFHIx.

    What is the value of ANAREFCTL.ANAREFSEL in steady state? Looks like you may have configured that to internal mode, hence the VREFHI value is supplied internally and reading ~1.65V.

    Best Regards,

    Nirav

  • 0 in reply to Nirav Ginwala
    Intellectual 590 points

    hi, I have checked with my SW and SYS Engineers, their settings is correct. My col did isolate VREFHIx pin from other circuitry, VREFHIx pins did not see 1.65V at all. I think I would need to search harder. Somewhere is leaking currents to VREFHIx pins.