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aic3256 power sequencing

Deb
Prodigy 70 points


We are powering on the 3.3V IOVDD on the aic3256 before the common 1.8V VSYS, AVDD, DVDD, DVDD_CP and DRVDD_HP. Is this okay? If so would it be okay to move DRVDD_HP to the 3.3V supply which would then power up with IOVDD but before all the 1.8V supplies.
  • 0
    TI__Guru* 84915 points
    Hi, Deb,

    The most important thing on power up sequences of the codec is separate the analog activity from digital activity. Our codecs are tolerant to power supply sequences, but in certain cases some issues are associated with them. So, for these cases is necessary to turn on the IOVDD at first, then the analog supplies (AVDD, VSYS, DRVDD_CP, DRVDD_HP) and finally the DVDD supply.

    Best regards,
    Luis Fernando Rodríguez S.