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BQ27545-G1: About the internal register that counts the amount of discharge

Hitoshi Okuma
Prodigy 230 points
Part Number: BQ27545-G1
Other Parts Discussed in Thread: BQSTUDIO,

Hi, 

Please let me know just in case.
If this IC is disconnected from the battery while it is operating, will the discharge amount count in the internal register return to zero the next time it starts up?

Also, this register cannot be observed externally, right? (bqstudio etc.)

Regards,
Hitoshi Okuma

  • 0
    TI__Genius 15415 points

    Hi Hitoshi Okuma,

    The BQ27545-G1 is an Impedance Track flash gauge, it will save all information learned to the internal flash and will remember this information upon POR. Disconnecting the battery or cutting the power will not cause the gauge to reset flash values. The accumulated discharge should not reset to 0 when power is lost.

    Yes, this value cannot be accessed externally. I recommend monitoring Cycle Count and configure CC threshold properly to monitor accumulated discharge.

    Regards,

    Evan 

  • 0 in reply to Diego
    Prodigy 230 points

    Hi Evan,

    Thank you for checking.

    "The internal register that accumulates the discharge"
    This is not saved directly to DF, right?
    And this is RAM and I think it returns to zero on POR, what do you think?
    (The attached image is slua656, P.7, 3.5 Data, Cycle Count)

    Regards,

    Hitoshi Okuma

  • +1 in reply to Hitoshi Okuma
    TI__Genius 15415 points

    Hi,

    The internal register should not reset unless the CC Threshold his met. It will not reset after a POR.

    Regards,

    Evan

  • 0 in reply to Diego
    Prodigy 230 points

    Hi, Evan,

    Thank you for providing such great information.

    Regarding the internal count register (private):

    * Should not be reset unless CC Threshold is exceeded
    * Therefore, it is not reset even after POR

    This is the spec I would expect. I'm glad.

    Regards,
    Hitoshi Okuma