BQ2013H Datasheet, PDF (6/24 Pages) Texas Instruments – Gas Gauge IC for Power- Assist Applications

bq2013H
Example: Selecting a PFC Value
Given:
Sense resistor = 0.0075Ω
Number of cells = 14
Capacity = 5000mAh, NiCd cells
Current range = 1A to 30A
Relative display mode with 4 second timer
Self-discharge = 1% per day
Trickle charge compensation = 0.85
Typical offset = -75µV
Voltage drop across sense resistor = 5mV to 150mV
Therefore:
Select:
5000mAh _* 0.0075Ω = 37.5mVh
PFC = 448000 counts or 35mVh
PROG₁, PROG₂ = Z, L
PROG₃ = Z
PROG₄ = H
PROG₅ = L
PROG₆ = Z
Table 2. bq2013H Programmed Full Count mVh Selections
Programmed
Full Count (PFC)
27136
24064
41472
35072
28672
44800
30720
38400
12800
mVh
84.8
75.2
64.8
54.8
44.8
35
24
15
5
Scale
1
320
1
320
1
640
1
640
1
640
1
1280
1
1280
1
2560
1
2560
PROG₁
H
H
H
Z
Z
Z
L
L
L
PROG₂
H
Z
L
H
Z
L
H
Z
L
Table 3. Programmed Self-Discharge
PROG₃
H
Z
L
Self-Discharge
1.6% per day
0.8% per day
0.2% per day
6