BQ2406X Datasheet, PDF (12/31 Pages) Texas Instruments – 1A SINGLE-CHIP Li-Ion/Li-Pol CHARGE MANAGEMENT IC WITH THERMAL REGULATION

bq2406x
SLUS689 – JUNE 2006
STATE MACHINE DIAGRAM
RECHARGE
DETECTION
No
V(TS) >V(TS2) OR
V(TS) < V(TS1)
VI(BAT ) < V(RCH )
V(TS) < V(TS2) AND
V(TS) > V(TS1)
ANY
STATE
Suspend
Set Charge Off,
Stop timers,
Keep timer count,
STATn=Hi-Z
Yes
VDETECT
ENABLED
Enable I(DETECT) for
Yes
No
t(DETECT)
VI(BAT)<V(LOWV)
Battery Present
GO TO
No
Begin Charge
BATTERY
DETECTION
Yes
Apply IO(PRECHG) for
t(DETECT)
No
VI(BAT ) > V(RCH )
ANY
STATE
Yes
Battery Absent
Charge Off
V(TS) >V(TS2) OR
V(TS) < V(TS1)
Suspend
Set Charge Off,
Stop timers,
Keep timer count,
STATn=Hi-Z
V(TS) >V(TS2) OR
V(TS) < V(TS1)
V(TS) < V(TS2) AND
V(TS) > V(TS1)
/CE=HI OR
V( IN) >V( OVP)
Yes
Stand-by
STATn set to HI-Z,
update /PG status,
enable control logic
/CE=LO AND
[V(BAT)+V(INDT) ]
< V(IN) <
V( OVP)
T(POR)
Expired?
Power-on-reset
Turn off charger ,
STATn and PG
set to HI-Z,
No
reset timers
Begin Charge
Reset ALL TImers
V(IN) > V(POR) AND
V(IN) > V(OUT)+VIN(DT)
[V(IN) -V(OUT)] <
[VIN(DT) - VHYS(INDT) ]
Sleep
Turn off charger ,
STATn , /PG set to
HI-Z , monitor
input power
V(IN) < V(POR)
V(IN) > V(POR)
Power down
All IC functions off
STATn and PG
set to HI-Z
START -UP
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CHARGING
Enable IO(SHORT)
V(OUT) <V(SC)
Yes
current
T(PRCH) OFF
No
V(OUT)
<V(LOWV)
Reset T(CHG)
Yes
T(PRCH) ON
No
Reset T(PRCH)
T(CHG) ON
Regulate Current
or Voltage
Indicate Charge-
In-Progress
No
Yes
T(CHG) Expired?
ANY
STATE
No OR
timers disabled
Yes
V(OUT)
<V(LOWV)
No
OR
No
termination
disabled
ITERM
detection?
Yes AND
termination
enabled
Termination
Indicate
Termination
Yes AND
timers enabled
Yes
ANY
STATE
Regulate
IO(PRECHG)
Indicate Charge-
In-Progress
No OR
Timers disabled
V(OUT)
<V( LOWV)
Yes
T(PRCH)
Expired?
Yes AND
Timers enabled
Fault Condition
Indicate Fault
V(OUT)
> V(RCH)?
No
Enable IFAULT
current
No
V(OUT)
> V(RCH)?
Yes
Disable IFAULT
current
ANY
STATE
Done
Turn off charger ,
Indicate
Charge done
Reset timers
FAULT
RECOVERY
Figure 4. Operational Flow Chart
12
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