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problem with bq2013h

Rocket42
Prodigy 165 points
Other Parts Discussed in Thread: BQ2013H, BQ34Z110, BQ34Z100

hello, everyone

I am designing my gas gauge using bq2013h IC.

I read "bq2013HEVM-001 Gas-Gauge IC Evaluation Module" and bq2013h datasheet.

in bq2013h, I seen that discharging count happen when VSR0<-250 uV.

So, If when using Rs=10 mili-Ohm then Is< VSR0/Rs = 250x10-6/0.01= 25 mili-Ampe.

And follow "Figure 1: Application Diagram (page 3)": Idischarge is approximate to Is (if ISR and ISB is approximate to Zero).

So, Idischarge < 25 mA.

But at page 17 (chapter 6) in "bq2013HEVM-001 Gas-Gauge IC Evaluation Module" datasheet, discharge current min-max is 0.05 - 15A. it is more large than 25mA very much.

Why so? I don't understand that.

I think what else have I understood? please to support me.

thank you very much!

  • 0
    TI__Guru 73830 points

    Rocket,

    The datasheet is saying that discharge threshold is -25mA, where -100mA will be less than -25mA in absolute number terms. So,  Idischarge < -25 mA to be considered. It is a poor way to describe the threshold, because 100mA is a larger discharge current than 25mA.

    Regards

    Tom

  • 0 in reply to ThomasCosby
    Prodigy 165 points

    thank Tom,

    So, if I use bq2013h to make Battery analyzer that measure Battery's capacity.

    The first, for example, this analyzer is for 14.4V Lead acid. So how do I calculate resistance of load?

    The second, with different loads, measured battery capacity is different. in bq2013h datasheet, LCOMP is register for compensating different loads.

    So, how many is LCOMP's value to have indentical measured battery capacity?

    please to support?

    thank you very much!

  • 0 in reply to Rocket42
    TI__Guru 73830 points

    Rocket,

    This is a very old device and unfortunately we do not have any experts here to support it. I have not used this device, but it looks like you will have to characterize your battery under the various load conditions and use the LCOMP equation to setup the load compensation. You may want to consider using the bq34z110 device as it is our newest PbA gauge and we can provide better support for it.

    Tom

  • 0 in reply to ThomasCosby
    Prodigy 165 points

    ThomasCosby said:

    Rocket,

    This is a very old device and unfortunately we do not have any experts here to support it. I have not used this device, but it looks like you will have to characterize your battery under the various load conditions and use the LCOMP equation to setup the load compensation. You may want to consider using the bq34z110 device as it is our newest PbA gauge and we can provide better support for it.

    thanks, Tom

    My plane is use of TI's gas gauge IC to make battery analyzer.

    I viewed bq34z110 datasheet and seen that it only support Lead-Acid chemistry.

    please to recommend me gas gauge IC for Ni-Cd and Ni-Mh that you can support to.

    I will switch to using this ICs for my applications.

    thank you very much!

  • 0 in reply to Rocket42
    TI__Guru 73830 points

    Rocket,

    We will release the bq34z120 before the end of the year and it will support Ni-Cd and Ni-Mh cells. The pinout will be the same as the bq34z100, but the firmware will be optimized to support these chemistries.
    Regards
    Tom

  • 0 in reply to ThomasCosby
    Prodigy 165 points

    thank Tom,

    At this time. Isn't there any IC for Ni-Cd and Ni-Mh?

  • 0 in reply to Rocket42
    TI__Guru 73830 points

    Rocket,

    The bq20xx are currently the options that we have to support multi-cell solutions for these cells.

    Tom