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Original question:

TLV320AIC3007: TLV320AIC3007 Power Supply Sequencing

TLV320AIC3107: SPVDD sequencing requirement?

Jeffrey Bridge
Prodigy 20 points
Part Number: TLV320AIC3107

Tool/software:

Hello,

I have read the TLV320AIC3107 datasheet power sequencing section, which mentions the constraints on IOVDD, AVDD, DRVDD, and DVDD.  I have also read a bunch of forum posts here explaining why certain of those constraints exist.  However, I have not seen any stated requirement on SPVDD.  Would it be acceptable, for example, to have SPVDD come up tens of milliseconds before IOVDD?

Also, let's say I put a switch on DVDD (which is supposed to come up last) but not IOVDD (which is supposed to come up first).  Would it be okay for the chip to have IOVDD up and all other rails down, for an indefinite period of time, until I wanted to switch on all the rails other than IOVDD?

Thanks!

  • 0
    TI__Mastermind 34510 points

    Hi Jeffrey,

    The SPVDD only powers up the speaker drivers so it doesn't matter much where in the sequence it gets brought up.

    For your solution, there's no problem with bringing up IOVDD only and leaving it indefinitely. The time between IOVDD and AVDD has no max limit, it just can't be brought up at the same time.

    Best regards,
    Jeff McPherson