BQ33100_15 Datasheet, PDF (29/67 Pages) Texas Instruments – Super Capacitor Manager

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bq33100
SLUS987B – JANUARY 2011 – REVISED DECEMBER 2015
8.3.8.31 Filter
Filter defines the filter constant used in the AverageCurrent calculation, Equation 12:
AverageCurrent new = a x AverageCurrent old + (1 – a) x Current
where
• a = <Filter> / 256; the time constant = 1 sec/ln(1/a) (default 14.5 sec)
(12)
SUBCLASS
ID
SUBCLASS
NAME
OFFSET
107
Current
0
NAME
Filter
Table 34. Filter
FORMAT
Unsigned
Integer
SIZE IN
BYTES
1
MIN
VALUE
0
MAX
VALUE
255
DEFAULT
VALUE
239
UNIT
8.3.8.32 Deadband
Any current within ±DeadBand will be reported as 0 mA by the Current function
SUBCLASS
ID
SUBCLASS
NAME
OFFSET
107
Current
1
NAME
Deadband
Table 35. Deadband
FORMAT
Unsigned
Integer
SIZE IN
BYTES
1
MIN
VALUE
0
MAX
VALUE
255
DEFAULT
VALUE
0
UNIT
mA
8.3.8.33 CC Deadband
This constant defines the Deadband voltage for the measured voltage between the SR1 and SR2 pins used for
capacitance accumulation in units of 294 nV. Any voltages within ±CC Deadband do not contribute to
capacitance accumulation.
SUBCLASS
ID
SUBCLASS
NAME
OFFSET
107
Current
2
Table 36. CC Deadband
NAME
Deadband
FORMAT
Unsigned
Integer
SIZE IN
BYTES
1
MIN
VALUE
0
MAX
VALUE
255
DEFAULT
VALUE
UNIT
10
294 nV
8.4 Device Functional Modes
The bq33100 supports 2 different power modes:
• In Normal Mode, the bq33100 performs measurements, calculations, protection decisions and data updates in
1 second intervals. Between these intervals, the bq33100 is in a reduced power mode.
• In Shutdown mode the bq33100 is powered down with only a voltage based wake function operating
8.4.1 Operating Power Modes
The bq33100 has two operating power modes, Normal and Shutdown Mode.
Normal Mode — During normal operation, the bq33100 takes Current, Voltage and Temperature measurements,
performs calculations, updates SBS data, and makes protection and status decisions at one-second intervals.
Between these periods of activity, the bq33100 is in a reduced power state.
Shutdown — The bq33100 enters Shutdown mode if the following conditions are met:
• V_VCC ≤ Minimum Operating voltage
• ManufacturerAccess: Shutdown command received AND Current = 0 AND Voltage < Shutdown Voltage
threshold.
Upon initial power up or a reset of the bq33100, application of a voltage > V_STARTUP must be applied to the
VCCPACK pin. The bq33100 will then power up and enter Normal Mode.
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