BQ33100_15 Datasheet, PDF (19/67 Pages) Texas Instruments – Super Capacitor Manager

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bq33100
SLUS987B – JANUARY 2011 – REVISED DECEMBER 2015
Table 4. Lifetime Minimum Temperature
SUBCLASS
ID
SUBCLASS
NAME
OFFSET
59
Lifetime Data
2
NAME
Lifetime Min
Temp
FORMAT
Integer
SIZE IN
BYTES
2
MIN
VALUE
–600
MAX
VALUE
1400
DEFAULT
VALUE
50
UNIT
0.1°C
8.3.4.3 Lifetime Maximum Capacitor Voltage
During the operation lifetime of the bq33100 it gathers voltage data and if in Single mode (Operation Cfg
[STACK ] =0). During this time the bq33100 can be enabled to record the Maximum value that the measured
voltage reached. If the [LTE] flag is set, Lifetime Max Capacitor Voltage is updated if one of the following
conditions are met:
• any internally measured capacitor voltage – Lifetime Max Capacitor Voltage > 25 mV
• any internally measured capacitor voltage > Lifetime Max Capacitor Voltage for a period > 60 seconds
• any internally measured capacitor voltage Lifetime Max Capacitor Voltage AND any other lifetime value is
updated.
Table 5. Lifetime Max Capacitor Voltage
SUBCLASS SUBCLASS
ID
NAME
59
Lifetime Data
OFFSET
4
NAME
Lifetime Max
Capacitor
Voltage
FORMAT
Integer
SIZE IN
BYTES
2
MIN
VALUE
0
MAX
VALUE
32767
DEFAULT
VALUE
UNIT
0
mV
8.3.5 Safety Detection Features
The bq33100 supports a wide range of Super Capacitor and system safety detection and protection features that
are easily configured or enabled through the integrated data flash. These features are intended, through various
configuration options, to provide a level of safety from external influences causing damage to components with
the power path, for example: limiting the period of time the CHG FET is exposed to high current pulse charge
conditions
8.3.5.1 Capacitor Overvoltage (OV)
The bq33100 can detect capacitor overvoltage condition and protect capacitors from damage.
When any CapacitorVoltage5...1 exceeds (ChargingVoltage / number of capacitors (see Operation Cfg
[CC2,1,0] ) + OV Threshold) the [OV] flag in SafetyAlert is set.
When any CapacitorVoltage5...1 exceeds (ChargingVoltage / number of capacitors (see Operation Cfg
[CC2,1,0] ) + OV Threshold) for a period greater than OV Time the [OV] flag in SafetyStatus is set.
When the bq33100 is configured for Pack Mode, when Operation Cfg [STACK] =1, then a fault is detected
when Voltage exceeds (ChargingVoltage + OV Threshold) the [OV] flag in SafetyAlert is set.
When the bq33100 is configured for Pack Mode, when Operation Cfg [STACK] =1, then a fault is detected
when Voltage exceeds (ChargingVoltage + OV Threshold) for a period greater than OV Time the [OV] flag in
SafetyStatus is set.
This function is disabled if OV Time is set to zero.
In an overvoltage condition charging is disabled and the CHG FET is turned off, ChargingCurrent and
ChargingVoltage are set to zero.
The bq33100 recovers from a capacitor overvoltage condition if all CapacitorVoltages5..1 are equal to or lower
than (ChargingVoltage / number of capacitors (see Operation Cfg [CC2,1,0] ) + OV Recovery. If the bq33100 is
configured for Pack Mode then the recover occurs when Voltage is equal to or lower than (ChargingVoltage + OV
Recovery.
On recovery the [OV] flag is reset, and ChargingCurrent and ChargingVoltage are set back to appropriate values
per the charging algorithm.
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