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BQ2083 GG parameters.

Oleg Tsvetkov9760
Prodigy 30 points
Other Parts Discussed in Thread: BQ2083

1. I found Taper Termination Min parameter in GG file for BQ2083 but didn't manage to find it in datasheet. What is this parameter?

2. Parameter CC Delta is badly described. It's 4 bytes parameter but I don't understand how to calculate it. Nothing about it in datasheet.

Please help.

 

  • 0
    TI__Prodigy 480 points

    The taper termination min is the minimum current at which a taper termination will happen.  What this means is that the current must be between the current taper threshold and the taper termination min for a termination valid charge termination to occur.  This helps prevent false termination detection.

    The CC delta is not really described because it is very complicated and the EV software will do this for you.  So we opt to leave it to an app note.  Please see the calibration app note for more data:

    http://focus.ti.com/general/docs/litabsmultiplefilelist.tsp?literatureNumber=slva148a

  • 0 in reply to TravisN
    Prodigy 30 points

    Then what is the address in data flash for taper termination min and what is the data format?

  • 0 in reply to Oleg Tsvetkov9760
    TI__Prodigy 480 points

    First I have to say that I edited my answer above.  I said it was below the taper current and below the minimum.  Obviously that was a typo.  It should have said it must be between those 2 values.  

    This answer is a little more difficult.  there is not any information on this parameter and it used to be a hidden location.  I am surprised that it is in the software at all.  I really recommend not modifying it.  Its only purpose is to insure that ZERO current  read from the gauge will not be a valid value for primary charge termination.  

    This is how the formula works.  The minimum current for taper detection is actually specified as a capacity that must be accumulated each taper window.  It is programmed in data flash as 64 and computed as 64/256 = 0.25mAh.  With a 40s taper window, this is equivalent to 22.5mA of steady-state current flow:  22.5mA*40s/3600s = 0.25mAh.  Reporting this as a current is probably easier to understand, which is why the EV software reports it that way.

    The location in DF is row 2, location 77 (decimal) but the easiest way to change it is with EVSW