BQ2970 Datasheet, PDF (19/31 Pages) Texas Instruments – Cost-Effective Voltage and Current Protection Integrated Circuit

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Device Functional Modes (continued)
bq2970, bq2971, bq2972, bq2973
SLUSBU9C – MARCH 2014 – REVISED MARCH 2016
CAUTION
Some battery providers do not recommend charging a depleted (self-discharged)
battery. Consult the battery supplier to determine whether to enable or inhibit the 0-V
battery charger function.
9.4.8 Delay Circuit
The detection delay timers are based from an internal clock with a frequency of 10 kHz.
BAT
VSS
t_{D 0 ≤ tD ≤ tSCCD}
Time
V_SCC
t_D ˂ t_OCDD
V_OCD
VSS
Time
Figure 25. Delay Circuit
If the over-discharge current is detected, but remains below the over-discharge short circuit detection threshold,
the over-discharge detection conditions must be valid for a time greater than or equal to over-discharge current
delay t_OCCD time before the DOUT goes low to turn OFF the discharge FET. However, during any time the
discharge overcurrent detection exceeds the short circuit detection threshold for a time greater than or equal to
load circuit detection delay t_SCCD, the DOUT pin goes low in a faster delay for protection.
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