BQ2002FSNTRG4 Datasheet, PDF (3/17 Pages) Texas Instruments – NiCd/NiMH Fast-Charge Management ICs

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