Datasheet

7
bq2003
Battery
Temperature?
Discharge-Before-Charge
Commanced?
Trickle
CHG =
1 3/8s high
1/8s low
CHG =
1 3/8s low
1/8s high
Fast
CHG =
Low
Charge
Pending
Battery Voltage?
New Charge Cycle Start or
Discharge-Before-Charge
Command
V
EDV
< V
CELL
< V
MCV
and
V
HTF
< V
TEMP
< V
LTF
V
HTF
< V
TEMP
< V
LTF
Trickle
CHG =
High
V
EDV
< V
CELL
< V
MCV
Top-off
CHG =
1/8s low
1/8s high
V
TEMP
> V
LTF
or
V
TEMP
< V
HTF
V
CELL
< V
EDF
- V or
T/ t or
V
TEMP
<
V
TCO
or
Maximum
Time Out
Discharge
Top-off
selected?
Yes
Yes
No
Trickle
CHG =
1/8s low
1/8s high
Fast
CHG =
High
Hold-off
period
expired?
No
No
Trickle
CHG =
High
Hold-off
period
expires
t > 1.5t
MCV
V
CELL
> V
MCV
V
CELL
> V
MCV
V
CELL
> V
MCV
V
CELL
>
V
CELL
V
MCV
>
V
CELL
V
MCV
<
V
EDV
V
CELL
>
V
MCV
V
CELL
<
V
MCV
Charge
Complete
Battery
Absent
or Maximum
Time Out
V
TEMP
< V
TCO
SD2003.eps
V
CELL
<
V
MCV
Figure 3. State Diagram