Datasheet

3
bq2002E/G
OSC
TM
CC
LED
V
CC
V
SS
BAT
INH
Clock
Phase
Generator
Timing
Control
Sample
History
A to D
Converter
MCV
Check
Power
Down
TS
Bd2002CEG.eps
Voltage
Reference
Power-On
Reset
TCO
Check
HTF
Check
LBAT
Check
Charge-Control
State Machine
PVD, - V
ALU
Figure 3. Block Diagram
Chip on
V
CC
4.0V
Battery Voltage
too High?
Battery
Temperature?
Charge
Pending
Fast
LED =
Low
SD
2
00
2C
.e
p
s
Battery Voltage
too Low?
V
BAT
< 2V
V
TS
< 0.6
V
BAT
> 0.175
V
BAT
< 2V, and
V
TS
> V
CC
/2
V
BAT
>
2V
Top-off
LED = Z
Trickle
LED =
Flash
Trickle
LED = Z
V
BAT
> 2V
V
BAT
2V
V
CC
V
TS
> 0.6
V
CC
V
CC
,
0.175
V
CC
< V
BAT
V
CC
V
BAT
< 0.175
V
BAT
> 2V or
V
TS
< V
CC
/2 or
((PVD or - V or
Maximum Time Out)
and TM
Low)
V
BAT
V
TS
Maximum Time Out
2V or
V
CC
/2 or
(PVD or -
Maximum Time Out)
and TM = Low
V or
Figure 2. State Diagram