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Must the bq34z100-G1 be always connected to the battery

Sebastian M
Intellectual 720 points

Other Parts Discussed in Thread: BQ34Z100-G1

Hi,

we have a discussion here whether the bq34z100-G1 (or i guess any gas gauge) should be always connected to the lead acid battery or if it could be disconnected when the device is switched off.

I could not find a clear statement regarding this yet. I always thought it is necessary for the IT algorithm to always watch the battery.

But is it really necessary when there is no charge/discharge because the device is completely switched off?

How is it meant to be used and what happens if it is not used this way?

Regards

Sebastian

  • 0
    TI__Guru 73830 points
    The bq34z100-G1 was designed to be attached to the battery and powered up all of the time. If you cycle the power, then the device will run and FCC simulation to predict the FCC and RM when the power is restored. This simulation may not represent the true SOC of the battery , since PbA cells rest to a high value after being fully discharged. At that point, you will need to fully charge the pack to allow the gauge to establish a good reference point.
  • 0 in reply to ThomasCosby
    TI__Guru 73830 points
    Ernesto
    The gauge will run a simulation and estimate the capacities after the device has been powered up. The problem with LiFePO4 cells is that the OCV curve is very flat and the gauge will have difficulty with estimating the RemCap accurately. You have see 15 to 20% error in the SOC due to this error.

    Tom