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BQ78412 Fiches technique(PDF) 23 Page - Texas Instruments

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No de pièce BQ78412
Description  Pb-Acid Battery State-of-Charge Indicator With Run-Time Display
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Fabricant  TI [Texas Instruments]
Site Internet  http://www.ti.com
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BQ78412 Fiches technique(HTML) 23 Page - Texas Instruments

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SLUSAA0 – OCTOBER 2010
Depth of Discharge (DoD) Counters
These counters are used to generate a histogram of the depth of discharge reached at the end of discharge. On
each
transition
from
discharge
to
charge,
the
appropriate
counter
is
incremented
based
on
the
Depth-of-Discharge (DoD = 100% – SoC) if the drain is significant (see description of DoDThresh parameter
below). Note that the increment happens even if the previous cycle did not return to 100% full. Each counter is of
2 bytes and can store values from 0 to 65535.
DoD80Count : Counts events where 100%
≥ DoD > 80%
DoD60Count : Counts events where 80%
≥ DoD > 60%
DoD30Count : Counts events where 60%
≥ DoD > 30%
DoD10Count : Counts events where 30%
≥ DoD > 10%
DoD0Count : Counts events where 10%
≥ DoD > 0%
The DoD10Count and DoD0Count increment every 16 counts so that the range is 65535 x 16 = 1,048,560.
The DoDThresh parameter sets the threshold (in 0.1 Ah steps) for the capacity drain during a discharge below
which the event does not cause an increment. The capacity drain is calculated as the difference between the
capacity at the beginning of discharge and that at the end of discharge.
Charge Counters
These counters calculate the cumulative charge in and out of the battery. These data are stored in 2 bytes in
steps of 16 Ah. Thus the maximum value stored is 65535×16 Ah or 1,048,560 Ah, which is equivalent to >3495
full discharge cycles of a 300-Ah battery.
ChargeAH: Cumulative amp-hours in to the battery (includes charge efficiency compensation using the ChgEff
parameter)
DischargeAH : Cumulative amp-hours out from the battery.
Discharge Time Counter
This counter records the cumulative time in discharge mode. As with the abuse counters, this counter increments
every 6 minutes This counter is of 2 bytes and can store values from 0 to 65535. This range permits a maximum
time of 273 days to be recorded.
Copyright © 2010, Texas Instruments Incorporated
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