BQ24004 Datasheet, PDF (13/22 Pages) Texas Instruments – TWO-CELL Li-ION CHARGE MANAGEMENT IC FOR PDAs AND INTERNET APPLIANCES

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SLUS476B – DECEMBER 2000 – REVISED MAY 2002
POR
Yes
VI(VSENSE) < V(LOWV)?
Reset and Start
22.5 min Timer
No
Reset All Timers,
Start Charge Timer
(TMR SEL Input)
Regulate Current
or Voltage
Indicate Charge
Yes
VI(VSENSE) > V(OVERV)?
No
Yes
Charge Timer
Expired?
No
Yes
VI(VSENSE) < V(LOWV)?
No
Taper
Yes
Detected?
Start 22.5 min
Timer
Indicate DONE
Regulate
I(PRECHG)
Indicate Pre–
Charge
Yes
VI(VSENSE) > V(OVERV)?
No
No
VI(VSENSE) < V(LOWV)?
Yes
22.5 min Timer No
Expired?
Yes
Fault Condition
Indicate Fault
POR?
or
APG/THERM toggle?
No
or
EN toggle?
Yes
No 22.5 min Timer
Expired?
Yes
Turn Off Charge
Indicate DONE
VI(VSENSE) < V(HIGHV)?
or
No
POR?
or
APG/THERM Toggle?
or
EN Toggle?
Yes
Figure 15. Operational Flow Chart
13