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| BQ24400_16 Datasheet, PDF (4/27 Pages) Texas Instruments – Programmable NiCd/NiMH Fast-Charge Management IC | |||
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bq24400
SLUS498A â SEPTEMBER 2001 â REVISED FEBRUARY 2010
VCC Reset
or
Battery Replacement at any time
4.0 V < VCC < 6.0 V
Charge
Initialization
Sleep
Mode
VBAT < VSLP
VSLP < VBAT < VCC
Charge
Suspended
VTS > VHTF
VTS < VHTF
Battery Voltage (Voltage at BAT pin
checked continuously. PVD checked
at rate of MTO/128.)
VBAT < VMCV
Battery Temperature
(Temperature at TS pin checked
continuously)
VMCV < VBAT < VSLP
Charge
Qualification
State
VTS < VHTF
Battery
Conditioning
VBAT < VLBAT or
VTS > VLTF
VLBAT < VBAT and
VHTF < VTS < VLTF
VTS > VLTF
VLBAT < VBAT < VMCV and
VHTF < VTS < VLTF
PVD (after hold-off period),
or VTS < VTCO or
Time = MTO
Fast Charge State
Current
Regulation
Trickle
Maintenance
Charge
NO
Top-Off
Selected?
VTS > VLTF
YES
VTS > VHTF
VTS < VLTF and
Time < MTO
Time = MTO
Top-Off
VBAT ⥠VMCV
VTS < VHTF
VBAT ⥠VMCV
Done
Charge
Suspended
(See Note)
VTS < VHTF
VTS > VHTF
and Time < MTO
VCC Reset or Battery Replacement
NOTE: If VTS < VTCO at any time, may only return to Trickle Maintenance Charge state and not to Top-Off.
Figure 2. State Diagram
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