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SLUS694B – MARCH 2006 – REVISED AUGUST 2006
FUNCTIONAL DESCRIPTIONS (continued)
POR
SLEEP MODE
Vcc > VI(BAT)
checked at all
times?
Yes
No
Indicate SLEEP
MODE
V I(BAT) < V(LOWV)
?
Yes
Reset and Start
t(PRECHG) timer
Regulate
I O(PRECHG)
Indicate Charge−
In−Progress
No
Reset all timers,
Start t (CHG) timer
Regulate Current
or V oltage
Indicate Charge−
In−Progress
No
V I(BAT)
<V(LOWV)
Yes
Yes
t(PRECHG)
Expired?
t (CHG)
Expired?
Yes
No
Yes
Fault Condition
V I(BAT)
?
<V(LOWV)
Indicate Fault
No
Yes
No
No
I (TERM)
detection?
V I(BAT) > V(RCH)
?
No
Enable I
(F AUL T)
current
No
Yes
Yes
T urn off charge
Yes
V I(BAT) > V(RCH)
?
Yes
Indicate DONE
Disable I (F AUL T)
No
current
V I(BAT) < V(RCH)
?
Figure 3. Charge Control Operational Flow Chart
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