BQ2011K_11 Datasheet, PDF (6/22 Pages) Texas Instruments – Gas Gauge IC for High Discharge Rates

bq2011K
Therefore:
3. Nominal Available Charge (NAC):
Select:
1800mAh _* 0.002Ω = 3.6mVh
PFC = 35840 counts or 3.39mVh
SPFC = Z (float)
PROG1, PROG2 = H or Z
PROG3 = L
PROG4 = H or Z
The initial full battery capacity is 3.39mVh (1695mAh) un-
til the bq2011K “learns” a new capacity with a qualified
discharge from full to EDV.
NAC counts up during charge to a maximum value
of LMD and down during discharge and self dis-
charge to 0. NAC is reset to 0 on initialization and
on the first valid charge following discharge to EDV.
To prevent overstatement of charge during periods
of overcharge, NAC stops incrementing when NAC
= LMD.
Note: NAC is set to the value in LMD when
PROG₄ is pulled low during a reset.
Table 1. bq2011K Programmed Full Count mVh Selections
Programmed
Full Count (PFC)
40192
32256
28928
25856
35840
23296
mVh
3.81
3.05
2.74
2.45
3.39
2.21
Scale
1
10560
1
10560
1
10560
1
10560
1
10560
1
10560
Display
Mode
Absolute
SPFC
H
Z
L
H
Z
L
PROG1
H or Z
H or Z
H or Z
L
L
L
PROG2
H or Z
H or Z
H or Z
H or Z
H or Z
H or Z
PROG3
H or Z
H or Z
H or Z
H or Z
H or Z
H or Z
PROG4
H or Z
L
Table 2. Programmed Self-Discharge
NAC Reset Value
NAC = 0
NAC = PFC
Self-Discharge
Enabled
Disabled
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