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BQ78350-R1: sluubd3c.pdf p.61 Battery Low% and Battery_Low%

Peter,
Intellectual 290 points
Part Number: BQ78350-R1
 
Even if I read this, I can not understand the difference between Battery Low% and Battery_Low%.
I know that Battery_Low% is the DF value.
I rewrite the expression of 9.1.5 and 9.1.6 with my understanding as follows.
9.1.5
    Battery Low% = DataFlash(Battery_Low%) / 2.56;
    EDV2 to DOD = (1 - Battery Low%);
9.1.6
    Battery Low% = DataFlash(Battery_Low%) / 2.56;
    FCC(new) = DCR(final) = DCR(initial) + Measured Discharge to EDV2 + (FCC * Battery Low%)
Is this wrong?
If it is wrong, please tell me the correct formula.
  • 0
    TI__Guru 54715 points
    Hi Peter,
    The 2.56 factor does not belong in the equations. If Battery_Low% is the data flash value, default 700 of .01% representing 7%:
    9.1.5 the equation for the initial value of DOD at EDV2 = (1 - Battery_Low%/10000) x 16384; or 93% of this number.

    9.1.6 FCC(new) = DCR(final) = DCR(initial) + Measured Discharge to EDV2 + (FCC * Battery Low%/10000); or the measured discharge to get to EDV2 + 7% of the prior FCC.
    I'm not sure how the author will enter the equation when the document is updated.
  • 0 in reply to WM5295
    Intellectual 290 points
    Hi Wm5295,
    I read your explanation and I wrote the formula again. This is redundant in order to explain my understanding. Please be patient and read. I ignore 2.56.
    /*
    * 9.1.5
    */
    @Battery_Low%
    default value is 700, unit 0.01%,
    default value is 7%,
    @Battery Low%
    'Battery Low%' = Battery_Low / 100 (same 700/10000),
    Battery Low% = 0.07,
    @initial 'DOD at EDV2'
    (1 - Battery Low%) * 16384 =
    (1 - 0.07) * 16384 =
    0.93 * 16384 =
    15237.12
    /*
     * 9.1.6
     */
    @Battery Low%
    0.07 (same 9.1.5 @Battery Low%)
    @FCC(new)
    = DCR(final) = DCR(initial) + Measured Discharge to EDV2 + (FCC * 0.07)
    Sorry to confirm again. Is this correct? I think that the above formula is OK if it is equivalent to your formula.
    Please note the distinction between Battery_Low%(DF value) and Battery Low%(temporary variable for calculation). My question also includes the problem that it is difficult to distinguish the two from the description of the technical note.
  • 0 in reply to Peter,
    TI__Guru 54715 points
    Hi Peter,
    I think you have it. I agree that it is confusing, hopefully they will use different names in the revision.
  • 0 in reply to WM5295
    Intellectual 290 points

    Hi WM5295,
    I would like the following.

    @Correct typing errors thoroughly (e.g. CEDVStatus (), 9.1.3 Qmax, The last sentence of 9.1.8, etc)
    @Do not let the magic number appear. (e.g. 2.56)
    @Do not let the similar parameters appear. (e.g. 'Battery_Low%' VS 'Battery Low%')

    This hope is not limited to sluubd3c.
    My first language is not English. As for me, I would like to be mandatory, not "hopefully". I hope that all TI documents will be easier to read.

  • 0 in reply to Peter,
    TI__Guru 54715 points
    Hi Peter,
    Thank you for the feedback.