BQ24901 Datasheet, PDF (8/18 Pages) Texas Instruments – SINGLE-CELL LI-ION AND LI-POL CHARGE MANAGEMENT IC FOR OFFLINE APPLICATIONS

bq24901
SLUS527 – DECEMBER 2002
APPLICATION INFORMATION
POR
Yes
No
Battery
Present?
Yes
TS pin
in LTF to HTF
range?
Check for battery
Presence
No
Indicate BATTERY
ABSENT
Suspend charge
No
Indicate CHARGE
SUSPEND
Yes
V_BAT <V_LOWV
Yes
Reset and Start
T30min timer
No
Regulate
I_PRECHG
Indicate Charge–
In–Progress
Reset and Start
T5hr timer
TS pin
in LTF to TCO
range?
Regulate
Current or Voltage
Indicate Charge–
In–Progress
TS pin
in LTF to TCO
range?
Yes
T5hr Expired?
No
V_BAT <V_LOWV
No
I_TERM detection?
Yes
No
V_BAT <V_LOWV
Suspend charge
No
Indicate CHARGE
SUSPEND
No
TS pin
in LTF to HTF
range?
Yes
T30min
Expired?
Yes
Reset and Start
Yes
T5hr timer
Yes
– Fault Condition
– Enable I_DETECT
Indicate Fault
Yes
– Turn off charge
– Enable I_DISCHG for
t_DISCHG2
Indicate Charge–
In–Progress
V_BAT < V_RCH ?
Charge Complete
No
Indicate DONE
Battery
Replaced?
Suspend charge
No
Indicate CHARGE
SUSPEND
No
TS pin
in LTF to HTF
range?
Yes
Reset and Start
T30min timer
No
No
Yes
Battery Removed
Yes
Indicate BATTERY
ABSENT
Figure 3. Operational Flow Chart
8
www.ti.com