BQ24081_12 Datasheet, PDF (15/25 Pages) Texas Instruments – 1-A, SINGLE-CHIP, LI-ION AND LI-POL CHARGER IC

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bq24080
bq24081
SLUS698E – MARCH 2006 – REVISED AUGUST 2011
Timer Fault and Recovery
As shown in Figure 7, the device provides a recovery method to deal with timer fault conditions. The following
summarizes this method:
Condition Number 1
OUT pin voltage is above the recharge threshold (V_(RCH)), and a timeout fault occurs.
Recovery method: the device waits for the OUT pin voltage to fall below the recharge threshold. This could
happen as a result of a load on the battery, self-discharge, or battery removal. Once the OUT pin voltage falls
below the recharge threshold, the device clears the fault and starts a new charge cycle. A POR, TE, or CE toggle
also clears the fault.
Condition number 2
OUT pin voltage is below the recharge threshold (V_(RCH)), and a timeout fault occurs
Recovery method: Under this scenario, the device applies the I_(FAULT) current. This small current is used to detect
a battery removal condition and remains on as long as the battery voltage stays below the recharge threshold. If
the OUT pin voltage goes above the recharge threshold, then the device disables the I_(FAULT) current and
executes the recovery method described for condition number 1. Once the OUT pin voltage falls below the
recharge threshold, the bq24080 clears the fault and starts a new charge cycle. A POR, TE, or CE toggle also
clears the fault.
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