BQ33100_15 Datasheet, PDF (21/67 Pages) Texas Instruments – Super Capacitor Manager

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bq33100
SLUS987B – JANUARY 2011 – REVISED DECEMBER 2015
When Current exceeds OC Chg for a period greater than OC Chg Time the [OCC] flag in SafetyStatus is set
and ChargingCurrent and ChargingVoltage are set to 0.
This function is disabled if OC Chg Time is set to zero.
The overcurrent fault is cleared when Current falls below OC Chg Recovery. When a charging-fault 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 [OCC] flag in SafetyStatus is reset.
8.3.5.6 Overcurrent During Discharging (OC Dsg)
The bq33100 overcurrent is discharge detection executed by the integrated AFE is configured by the bq33100
data flash OC Dsg and OC Dsg Time registers.
When the integrated AFE detects a overcurrent in discharge condition the charge FET is turned off and the
[OCD] flag in SafetyStatus is set, the internal current recovery timer is reset and ChargingCurrent and
ChargingVoltage are set to 0.
The recovery is controlled by the bq33100 and requires that Current be ≤ OC Dsg Recovery threshold and that
the internal AFE current recovery timer ≥ Current Recovery Time.
When the recovery condition is detected, ChargingCurrent and ChargingVoltage are set to the appropriate value
per the charging algorithm, and the [OCD] flag inSafetyStatus is reset.
8.3.5.7 Short-Circuit During Charging (SC Chg)
The bq33100 short-circuit during charging protection is executed by the integrated AFE is configured by the
bq33100 data flash SC Chg Cfg register.
When the integrated AFE detects a short circuit fault the charge FET is turned off and the [SCC] flag in
SafetyStatus is set, the internal current recovery timer is reset and ChargingCurrent and ChargingVoltage are set
to 0.
The recovery is controlled by the bq33100 and requires that AverageCurrent be ≤ SC Recovery threshold and
that the internal AFE current recovery timer ≥ Current Recovery Time.
When the recovery condition is detected, ChargingCurrent and ChargingVoltage are set to the appropriate value
per the charging algorithm, and the [SCC] flag inSafetyStatus is reset.
8.3.5.8 Short-Circuit During Discharging (SC Dsg)
The bq33100 short-circuit during discharging detection is executed by the integrated AFE is configured by the
bq33100 data flash SC Dsg Cfg register.
When the integrated AFE detects a short circuit fault the charge FET is turned off and the [SCD] flag in
SafetyStatus is set, the internal current recovery timer is reset and ChargingCurrent and ChargingVoltage are set
to 0.
The recovery is controlled by the bq33100 and requires that Current be ≤ SC Recovery threshold and that the
internal AFE current recovery timer ≥ Current Recovery Time.
When the recovery condition is detected, ChargingCurrent and ChargingVoltage are set to the appropriate value
per the charging algorithm, and the [SCD] flag inSafetyStatus is reset.
8.3.5.9 AFE Watchdog (WDF)
The integrated AFE automatically turns off the CHG FET and sets the [WDF] flag in SafetyStatus if the integrated
AFE does not receive the appropriate frequency on the internal watchdog input (WDI) signal.
8.3.5.10 Integrated AFE Communication Fault (AFE_C)
After a full reset the bq33100 and the AFE offset and gain values are read twice and compared. The AFE Init
Limit sets the maximum difference in A/D counts of two successful readings of offset and gain, which the device
still considers as the same value. If the gain and offset values are still not considered the same after AFE Init
Retry Limit comparison retries, the device reports a permanent failure error by setting SafetyStatus() [AFE_C].
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