BQ24013 Datasheet, PDF (15/21 Pages) Texas Instruments – SINGLE-CHIP, LI-ION CHARGE MANAGEMENT IC FOR HANDHELD APPLICATIONS (bq TINY)

bq24010, bq24012, bq24013, bq24014
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SLUS530F − SEPTEMBER 2002 − REVISED AUGUST 2005
FUNCTIONAL DESCRIPTION
TIMER FAULT RECOVERY
As shown in Figure 5, bqTINY provides a recovery method to deal with timer fault conditions. The following conditions
summarize this method.
Condition #1: Charge voltage above recharge threshold (V_(RCH)) and timeout fault occurs
Recovery method: bqTINY waits for the battery 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 battery falls below the recharge threshold,
the bqTINY clears the fault and enters the battery absent detection routine. A POR or CE toggle also clears the fault.
Condition #2: Charge voltage below recharge threshold (V_(RCH)) and timeout fault occurs
Recovery method: Under this scenario, the bqTINY 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
battery voltage goes above the recharge threshold, then the bqTINY disables the I_(FAULT) current and executes the
recovery method described for condition #1. Once the battery falls below the recharge threshold, the bqTINY clears
the fault and enters the battery absent detection routine. A POR or CE toggle also clears the fault.
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