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BQ27441-G1: Accurately determining state of charge

William Huang28
Prodigy 180 points
Part Number: BQ27441-G1
Other Parts Discussed in Thread: BQ24075

We are planning to use the BQ27441 fuel gauge and BQ24075 charger in our system. I'm fairly new to all these battery terms and mechanics, but while going through some datasheets and videos, I noticed that the Impedance Tracking algorithm talks about an open circuit voltage. I also know that the BQ24075 has a SYSOFF pin the cut the battery off from the system load, effectively providing that open circuit voltage for the B27441 gauge. Just to clear my understanding a little, is it necessary for the BQ27441 to see an open circuit voltage from the battery in order to accurately determine the battery's state?

Thanks,

William

  • 0
    TI__Guru* 76230 points
    Hi William.
    The gauge needs intermittent relaxations periods in order to maintain high accuracy. During these relaxation periods, OCV measurements are taken which are used in calculating the qmax ( total chemical capacity) which is used in performing other calculations. These relaxation periods can be achieved during low power states of your application, i.e when the application is not in use.

    I hope this helps.

    thanks
    Onyx