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TPS65930: Power consumption in BACKUP state

Erik Johnson2
Prodigy 65 points
Part Number: TPS65930
Other Parts Discussed in Thread: DM3730

Hi, I am refactoring an older design using the DM3730 and TPS65930.  TI document SWCA025 indicates:

"To reduce power consumption in BACKUP state, the software can configure the 32-kHz clock to be in low-power mode by setting the CFG_BOOT CK32K_LOWPWR_EN..."

The data sheet (SWCS037I) indicates the "typical" power consumption in BACKUP is 7.2 uW but it does not indicate anything about the "low power" 32 kHz clock mode.

Does anyone know anything about the difference in power consumption between the two modes (in the BACKUP state)?

Thanks,

Erik

  • 0
    TI__Genius 12735 points

    Hi Erik,

    Unfortunately I do not have this information available. This is a legacy part with limited support so we are limited to using the information found in the datasheet and TRM.

    Best regards,

    Layne J

  • 0 in reply to Layne J
    Prodigy 65 points

    Thanks Layne, understood.

    Just to leave a little info in case anyone else ever runs into this...

    I made some rough measurements of current flowing out of the battery in the backup state.  When the CFG_BOOT:CK32K_LOWPWR_EN bit is cleared, the current was about 3 uA; when set, the current was a little less than 1 uA.  I did not dig deeper to try and understand what functions may have changed, but from a macro level, the system functionality does not appear to be impacted.

    Erik

  • 0 in reply to Erik Johnson2
    TI__Genius 12735 points

    Hi Erik,

    Thank you for providing this information for other users of this device. We always appreciate valuable feedback in cases like this.

    Best regards,

    Layne J