Datasheet

3
bq2002/F
Battery
Temperature?
Battery
Voltage?
Chip on
V
CC
4.0V
V
CC
2V
Top-off
LED = Z
Trickle
LED = Z
Fast
LED = Low
Maximum Time-Out
or
or
V
BAT
< 2V
V
BAT
> 2V
SD2002/F01
V
TS
> V
CC
/2 V
TS
< V
CC
/2
V
BAT
> 2V
V
BAT
> 2V
V
TS
< V
CC
/2
V
TS
< V
CC
/2
((PVD or - V or
Maximum Time-Out)
and TM = high)
(PVD or - V or
Maximum Time-Out)
and TM = high
Figure 2. State Diagram
OSC
TM
CC
LED
V
CC
V
SS
BAT
INH
Clock
Phase
Generator
Timing
Control
Sample
History
A to D
Converter
MCV
Check
TS
Bd2002f.eps
Voltage
Reference
PVD, -∆V
ALU
Power-On
Reset
TCO
Check
Power
Down
Charge-Control
State Machine
Figure 3. Block Diagram