BQ33100_15 Datasheet, PDF (20/67 Pages) Texas Instruments – Super Capacitor Manager

bq33100
SLUS987B – JANUARY 2011 – REVISED DECEMBER 2015
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NOTE
When ChargingVoltage has been set to 0 due to a detected condition then the capacitor
overvoltage function is suspended.
8.3.5.2 Capacitor Voltage Imbalance (CIM)
The bq33100 starts capacitor voltage imbalance detection when Current is less than or equal to CIM Current
AND ALL CapacitorVoltage5..1 > Min CIM Check Voltage.
When the difference between highest capacitor voltage and lowest capacitor voltage exceeds CIM Fail Voltage
the [CIM] flag in SafetyAlert is set.
When the difference between highest capacitor voltage and lowest capacitor voltage exceeds CIM Fail Voltage
for a period greater than CIM Time the [CIM] flag in SafetyStatus is set and ChargingCurrent and
ChargingVoltage are set to 0 and the CHG FET is turned off. SafetyStatus() [CIM] is cleared and CHG FET is
allowed to turn ON when the differences between the highest capacitor voltage and lowest capacitor voltage is
less than CIM Recovery.
This function is disabled if CIM Time is set to zero.
The capacitor voltage imbalance detection is cleared when the difference between highest capacitor voltage and
lowest capacitor voltage is less than CIM Fail Voltage. When this is detected then the CHG FET is allowed to be
turned on, if other safety and configuration states permit, ChargingCurrent and ChargingVoltage are set to the
appropriate value per the charging algorithm, and the [CIM] flag in SafetyStatus is reset.
8.3.5.3 Weak Capacitor (CLBAD)
When the capacitor array has been fully charged (indicated by OperationStatus [FC] being set) then it is
monitored for excessive leakage.
When Current exceeds CLBAD Current the [CLBAD] flag in SafetyAlert is set.
When Current exceeds CLBAD for a period greater than CLBAD Time the [CLBAD] flag in SafetyStatus is set.
This function is disabled if CLBAD Time is set to zero.
In a weak capacitor condition charging is disabled and the CHG FET is turned off, ChargingCurrent and
ChargingVoltage are set to zero.
The weak capacitor fault is cleared when Current falls equal to or below the CLBAD Recovery limit. When the
recovery condition is detected, then the CHG FET is allowed to be turned on, if other safety and configuration
states permit, ChargingCurrent and ChargingVoltage are set to the appropriate value per the charging algorithm,
and the [CLBAD] flag in SafetyStatus is reset.
8.3.5.4 Overtemperature (OT)
The bq33100 has overtemperature protection to prevent charging at excessive temperatures.
When Temperature exceeds OT Chg the [OT] flag in SafetyAlert is set.
When Temperature exceeds OT Chg for a period greater than OT Chg Time the [OT] flag in SafetyStatus is set.
This function is disabled if OT Chg Time is set to zero.
In an overtemperature condition charging is disabled and the CHG FET is turned off, ChargingCurrent and
ChargingVoltage are set to zero.
The overtemperature fault is cleared when Temperature falls equal to or below the OT Chg Recovery limit.
When the recovery condition is detected, then the CHG FET is allowed to be turned on, if other safety and
configuration states permit, ChargingCurrent and ChargingVoltage are set to the appropriate value per the
charging algorithm, and the [OT] flag in SafetyStatus is reset.
8.3.5.5 Overcurrent During Charging (OC Chg)
The bq33100 has an independent level of recoverable overcurrent protection during charging.
When Current exceeds OC Chg the [OCC] flag in SafetyAlert is set.
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