BQ2002C_11 Datasheet, PDF (3/17 Pages) Texas Instruments – NiCd/NiMH Fast-Charge Management IC

Chip on
VCC 4.0V
Battery Voltage
too High?
VBAT > 2V
VBAT < 2V
Battery Voltage
too Low?
VBAT < 0.84V
0.84V < VBAT
VTS > VCC/2
Battery
Temperature?
VTS < VCC/2
Charge
Pending
Fast
LED =
Low
VBAT > 2V or
VTS < VCC/2 or
PVD or - V or
Maximum Time Out
VBAT > 0.84V and
VBAT < 2V and
VTS > VCC/2
Trickle
LED =
Flash
VBAT > 2V
VBAT 2V
Trickle
LED = Z
SD2002C.eps
Figure 2. State Diagram
bq2002C
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
LBAT
Check
MCV
BAT
HTF TCO _Power ^Check
Check Check _Down
CC
LED
TS
VCC
VSS
Bd2002CEG.eps
Figure 3. Block Diagram
3