BQ2005_13 Datasheet, PDF (8/18 Pages) Texas Instruments – Fast- Charge IC for Dual-Bat tery Packs

bq2005
New Charge Cycle
Started by either one of:
V_CC rising to valid level
Battery replacement
(VCELL
falling
through
V
)
MCV
V_EDV < V_CELL < V_MCV
DCMD_A tied to
ground?
(channel A only)
No or channel B
Battery Voltage?
Rising edge
on DCMD_A
Yes
V_CELL <
V_EDV
Discharge
CH_A = 1/8s
flash
Battery
Charge
Pending
V_CELL < V_EDV
V_TEMP > V_LTF or
Trickle
V_TEMP < V_HTF
CHG = 1/8s
V_CELL >
V_MCV
FCC_A = high
V_CELL > V_MCV
Temperature?
V_HTF < V_TEMP < V_LTF
flash
FCC = high
V_CELL > V_MCV
Fast
CHG = low
FCC = high
V_CELL > V_MCV
V_EDV < V_CELL < V_MCV
and
V_HTF < V_TEMP < V_LTF
Trickle
CHG = high
FCC = high
t>
t_MCV
Battery
Absent
Trickle
CHG = high
FCC = high
- V or T/ t or
V_TEMP < V_TCO or
Maximum Time Out
Top-off
selected? _Yes
No
V_CELL >
V_MCV
V_CELL <
V_MCV
V_CELL >
V_MCV
Charge
Complete
Top-off
Trickle
CHG = high
CHG = high
FCC = low ^VTEMP ^{< V}TCO FCC = low
or Maximum
Time Out
SD2005
Figure 4. State Diagram
8