BQ20Z80ADBTR Datasheet, PDF (17/25 Pages) Texas Instruments – SBS 1.1-COMPLIANT GAS GAUGE ENABLED WITH IMPEDANCE TRACK

bq20z80
bq20z80A
www.ti.com
SLUS782 – JULY 2007
CHANGE
bq20z80
bq20z80-V101
COMMENTS
Prevented lifetime updates until IT is Data flash lifetime data is updated
enabled
under all conditions.
Data flash lifetime data is not updated Improves suitability of lifetime data
until Impedance Track™ is enabled.
Aligned SBS.RemainingCapacity( )
with DF:Terminate Voltage
SBS.RemainingCapacity( ) could be
above zero when SBS.Voltage( )
reaches DF:Terminate Voltage.
Forces SBS.RemainingCapacity( ) to
zero when SBS.Voltage( ) is below
terminate voltage
Improves alignment between
reporting and system status
Disabled LEDs for undervoltage
conditions
When SBS.OperationStatus( ) [CUV
or PUV] is set, then the LED display
could be activated.
When SBS.OperationStatus( ) [CUV
or PUV] is set, the LED display is
disabled.
Reduces risk of deeply discharging
the battery
Clear SBS.BatteryStatus( ) [RCA]
SBS.BatteryStatus( ) [RCA] is not
when not SBS.BatteryStatus( ) [DSG] cleared when SBS.BatteryStatus( )
[DSG] is cleared.
SBS.BatteryStatus( ) [RCA] is now
cleared when SBS.BatteryStatus( )
[DSG] is cleared.
Corrected to meet SBS specification
Allowed sleep mode for undervoltage When SBS.OperationStatus( ) [CUV
conditions
or PUV] is set, then entry to sleep
mode is disabled.
When SBS.OperationStatus( ) [CUV
or PUV] is set, then entry to sleep
mode is allowed.
Reduces risk of deeply discharging
the battery
Improvements made to Lifetime data
Does not save maximum and
minimum lifetime AverageCurrent or
AveragePower. Only saves lifetime
data when new values exceed old
values by defined delta values
Saves maximum and minimum
lifetime AverageCurrent and
AveragePower. Lifetime data is saved
after a defined period of time even if
new values do not exceed old values
by defined delta values
Improves lifetime data
Changes made to pulse charging
Voltages for pulse charging are
sampled once a second.
Voltages for pulse charging are
sampled 4 times a second.
Improves pulse charging
Changes made to charging timeouts
The precharge timeout timer runs
when the charging current is below a
defined threshold; so, it is possible
that the precharge timer will run
during charging taper current and
cause an undesired precharge
timeout during charging taper.
The fast charge and precharge
timeout timers only run when
precharging or charging, as indicated
by FCHG and PCHG bits in
ChargingStatus.
Improves operation of fast charge and
precharge timeout timers
Changes made to discharge faults
Discharging fault is indicated
whenever BatteryStatus [TDA] is set.
Current discharging fault is not
indicated for current faults detect by
AFE. Separate discharging faults are
indicated for voltage and temperature.
Discharging fault is indicated for any
safety condition resulting in turning off
the discharge FET. Current
discharging fault is indicated for all
detected overcurrent conditions,
including overcurrent detected by
AFE. Temperature and voltage
discharge faults are not indicated
separately.
Improves indication of discharging
fault conditions
Improvements made to calibration
functions
Voltage calibration functions may
cause error in voltage calibration of
several millivolts.
Voltage calibration functions are
Improved voltage calibration accuracy
capable of accuracy within 1 millivolt.
Protect against simultaneous writes to
data flash
A SMBus-initiated data flash write
may occur at the same time as a data
flash write initiated by the AGG, which
my cause a data flash write error.
A SMBus-initiated data flash write
cannot occur at the same time as any
other data flash write.
Increased robustness of data flash
writes
Corrected
SBS.ManufacturerAccess( ) access of SBS.ManufacturerAccess( ) access of Allows host to determine bq20z80
SBS.ManufacturerAccess( ) access of silicon revision is not functional.
silicon revision is functional.
silicon revision
silicon revision
Corrected data flash checksum
operation
The data flash checksum includes
non-accessible portions of the data
flash that change when writing the
data flash checksum, invalidating the
checksum.
The data flash checksum only
includes data flash that does not
change when writing an updated data
flash checksum.
Data flash checksum operation works
correctly.
Corrections made to LED display
Fixed LED thresholds cannot be
selected.
Fixed LED thresholds can be
selected.
Correct operation of LED threshold
settings
Erroneous readings are corrected that
occurred after offset calibration when
sleep mode is not entered.
Erroneous SBS voltage, current, and
temperature readings occur after
current offset calibration if sleep mode
is not entered, corrupting the lifetime
data.
No erroneous SBS voltage, current,
and temperature readings occur after
current offset calibration if sleep mode
is not entered.
Improve reliability of lifetime data
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
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