BQ33100_15 Datasheet, PDF (18/67 Pages) Texas Instruments – Super Capacitor Manager

bq33100
SLUS987B – JANUARY 2011 – REVISED DECEMBER 2015
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8.3.3.1 Charge Termination
The bq33100 determines charge termination if:
• The average charge current < Taper Current during 2 consecutive Current Taper Window time periods,
AND
• Voltage + Taper Voltage ≥ ChargingVoltage
NOTE
To make sure that the charge terminates properly, TI recommends that Taper Current be
set to a value greater than the maximum charger voltage inaccuracy. In other words, the
charger taper current must be set to a lower value than the taper current programmed in
the dataflash to ensure proper charge termination and the FC bit gets set.
The bq33100 sets the [FC] flag in Operation Status when a valid charge termination occurs and cleared when
RelativeStateOfCharge is less than FC Clear %.
The taper voltage must be set to a value less than the OV threshold. This prevents an over voltage condition
from occuring after the CL bit clears upon learning completion.
The bq33100 can also determine charge termination if the RSOC is at a value equal to or greater than FC set %.
If this is not the desired means of charge termination, FC set % must be set to -1%.
8.3.3.2 CHG Over Ride Control
During the normal operation of the bq33100 the CHG output of the bq33100 is typically controlled automatically
but can be over ridden through the CHGOR pin (pin 21). On a low-to-high transition the CHG output is released
turning off the external CHG FET and on a high-to-low transition the CHG output is pulled low after a
programmable delay CHG Enable Delay. If CHG Enable Delay is programmed to 0 the delay is a maximum of
250 ms. If the CHG over ride function is not needed then the CHGOR pin must connect to VSS.
8.3.4 Lifetime Data Gathering
8.3.4.1 Lifetime Maximum Temperature
During the operation lifetime of the bq33100 it gathers temperature data. During this time the bq33100 can be
enabled to record the maximum value that the measured temperature reached. If the [LTE] flag is set in
OperationStatus, Lifetime Max Temp value is updated if one of the following conditions are met:
• internal measurement temperature – Lifetime Max Temp > 1 °C.
• internal measurement temperature > Lifetime Max Temp for a period > 60 seconds
• internal measurement temperature > Lifetime Max Temp AND any other lifetime value is updated.
Table 3. Lifetime Maximum Temperature
SUBCLASS SUBCLASS
ID
NAME
59
Lifetime Data
OFFSET
0
NAME
Lifetime Max
Temp
FORMAT
Integer
SIZE IN
BYTES
2
MIN
VALUE
0
MAX
VALUE
1400
DEFAULT
VALUE
350
UNIT
0.1°C
8.3.4.2 Lifetime Minimum Temperature
During the operation lifetime of the bq33100 it gathers temperature data. During this time the bq33100 can be
enabled to record the Minimum value that the measured temperature reached. If the [LTE] flag is set, Lifetime
Min Temp is updated if one of the following conditions are met:
• Lifetime Min Temp – internal measurement temperature > 1 °C.
• Lifetime Min Temp > internal measurement temperature for a period > 60 seconds
• Lifetime Min Temp > internal measurement temperature > AND any other lifetime value is updated.
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