BQ20Z80-V102_07 Datasheet, PDF (25/28 Pages) Texas Instruments – SBS 1.1-COMPLIANT GAS GAUGE ENABLED WITH IMPEDANCE TRACK TM TECHNOLOGY FOR USE WITH THE BQ29312A

bq20z80-V102
www.ti.com
SLUS681B – NOVEMBER 2005 – REVISED JANUARY 2007
CHANGE
bq20z80
bq20z80-V101
COMMENTS
Corrected the length of
SBS.ManufacturerData( ) command
SBS.ManufactureData( ) returned
additional data not specified in the
data sheet.
Only returns the appropriate data
Correct data set made available to
host
Changed DF:Charger Present default DF:Charger Present default was
voltage to 12000 mV
16800 mV.
Default changed to 12000 mV.
More realistic default for most
applications
Corrected LED display lock-up fault
when exiting sleep with LEDs on
LED display locks up if LEDs are ON LED display operates normally
Correct operation of the LED display
as the bq20z80 exits sleep mode.
regardless of power state transitions. under all conditions
Added report of any inability to write
DFF as flash write error in calibration
mode
If writing the data flash is not allowed
either due to a permanent failure or
low voltage, then no indication is
given when attempting to write data
flash in calibration mode.
The inability to write data flash in
Improved calibration system
calibration mode is reported as a flash interaction
write error.
Corrected issue of improperly clearing
AFE faults
AFE faults were detected and the
pack protected but the fault would be
cleared up to three times at an
interval of 250 milliseconds before the
defined recovery requirements would
apply.
AFE faults are correctly handled,
including the flags.
Improved system interaction when
faults occur
Modified code to save open-circuit
voltage (OCV) data on IT enable only,
not a full reset
OCV data was saved after a full reset
which could have disturbed the OCV
measurements if the battery was not
in a completely relaxed state.
OCV tables are only updated when IT Improved OCV data reliability under
enabled, or the IT enable command is all system conditions
resent.
Corrected range check for calibration
of analog-to-digital converter (ADC)
offset
In calibration mode, if the
measurement ADC offset was out of
range, no error would be reported.
In calibration mode, if the
measurement ADC offset is out of
range, an error is reported.
Improved calibration system
interaction
Implemented a validation time for
DOD0
There is a possibility of erroneous
DOD0 measurement if charge or
discharge current occurs at the same
time.
DOD0 measurement is not saved
unless the battery remains in the
relaxed state for a defined time after
the DOD0 measurement is made.
More reliable
SBS.FullChargeCapacity( ) and
SBS.RemainingCapacity under all
system conditions
Implemented a bounds limit to a
QMAX change
QMAX changes are not limited to
filter-bad readings.
QMAX changes are bounds limited to
filter-bad readings.
More reliable
SBS.FullChargeCapacity( ) and
SBS.RemainingCapacity under all
system conditions
Implemented a double hit for dv/dt
detection for QMAX qualification
The dv/dt qualification for QMAX
update requires only one sample to
be valid.
The dv/dt qualification for QMAX
update requires two samples to be
valid.
More reliable
SBS.FullChargeCapacity( ) and
SBS.RemainingCapacity( ) under all
system conditions
Corrected parameter update issue
caused by exiting sleep mode during
current measurement
If bq20z80 exits sleep during a
current measurement, the SBS
parameters do not update again until
the pack enters and exits sleep mode
again.
SBS parameter updates operate
normally regardless of power state
transitions.
Improved system interaction for sleep
mode transitions
Implemented an option to leave
charge FET on for a nonremovable
pack in sleep mode, enabled by
DF:Operation Cfg B [NRCHG].
When DF:Operation Cfg B [NR] is set, When DF:Operation Cfg B [NR,
then the CHG is turned off at entry to NRCHG] are set, then the CHG
sleep mode.
remains on at entry to sleep mode.
Improved system interaction options
Modified code such that if QMAX has
not been updated, old valid OCV
readings are discarded when a new
valid OCV reading is detected and the
conditions for QMAX update do not
exist.
Valid OCV is only discarded when all
conditions for QMAX update are
satisfied, but the accumulated error in
the measured capacity exceeds 1%
(default value).
If QMAX has been updated, the same
conditions for discarding an OCV
reading are the same as for the
bq20z80. Otherwise, old OCV
readings are discarded and new OCV
readings are used when the
conditions for a valid OCV reading
exist, but the conditions for QMAX
update do not exist.
Enables QMAX measurement for full
charge or discharge for the first
QMAX update, even if initial OCV
measurement is made when battery is
only partially charged.
Modified code such that if QMAX has
not been updated, then for QMAX
update to occur, the measured
capacity must be greater than or
equal to 90% (default value) of design
capacity.
The measured capacity must be
greater than 20% (default value) or a
value as determined from the QMAX
update filter constant for a QMAX
update to occur.
For the first QMAX, the measured
capacity must be greater than 90%
(default value) for a QMAX update to
occur. If QMAX update has occurred
the conditions for measured capacity
are the same as for the bq20z80.
Improved QMAX data reliability for the
first update of QMAX
Default minimum passed charge for
QMAX update has been changed
from 20% to 37%
Internal flash value of Min Passed
Charge is 20%. The default setting for
the QMAX update filter constant of 64
means actual Min Passed Charge for
QMAX update is 25%.
Internal flash value of Min Passed
Charge is 37%. This 37% is
consistent with the QMAX update
filter constant of 96.
Improved QMAX data reliability under
all system conditions.
Default QMAX update filter constant Internal flash value of QMAX update Internal flash value of QMAX update Improved QMAX data reliability under
has been changed from 64 to 94.
filter is 64.
filter is 94.
all system conditions.
QMAX values for nonexistent cells will DF:Qmax Cell 2..4 written with
be updated to Design Capacity.
random values if not used when
QMAX is updated
DF:Qmax Cell 2..4 are updated to = Ensure all QMAX values are
DF:Design Capacity if not used when reasonable, even if not used
QMAX is updated.
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