BQ2947_17 Datasheet, PDF (10/27 Pages) Texas Instruments – Overvoltage Protection for 2-Series to 4-Series Cell Li-Ion Batteries with External Delay Capacitor

bq2947
SLUSB15F – SEPTEMBER 2012 – REVISED JANUARY 2017
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Feature Description (continued)
For an NCH Open Drain Active Low configuration, the OUT pin pulls down to VSS when active (OV present) and
is high impedance when inactive (no OV).
VOV
V_OV –V_HYS
OUT (V)
t_CD
Figure 8. Timing for Overvoltage Sensing (OUT Pin Is Active High)
Figure 9 shows the behavior of CD pin during an OV sequence.
Fault condition
present
V_CD
V(CD)
Fault response
becomes active
V_OUT1
V (OUT)
t_CHGDELAY
t_CD
Note: Active High OUT version shown
Figure 9. CD Pin Mechanism (OUT Pin Is Active High)
NOTE
In the case of an Open Drain Active Low version, the V_OUT signal will be high and
transition to low state when the voltage on the V_CD capacitor discharges to the set level
based on the t_CD timer.
10
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