BQ20Z80ADBTR Datasheet, PDF (16/25 Pages) Texas Instruments – SBS 1.1-COMPLIANT GAS GAUGE ENABLED WITH IMPEDANCE TRACK

bq20z80
bq20z80A
SLUS782 – JULY 2007
www.ti.com
Table 4. CHANGE DETAILS (continued)
CHANGE
bq0z80-V102
The voltage table chemistry
ID can be read by writing
0x0008 to
ManufacturerAccess and
then reading from
ManufacturerAccess. The
default chemistry ID is
0x0100
New feature providing more
information
SBS.BatteryMode( ) is
initialized on high transition
of the SMBus lines to DF:Init
BatteryMode, instead of
always clearing
SBS.BatteryMode( ) defined
bits on high transition of the
SMBus lines.
Customization allows for
preserving SBS.BatteryMode( )
settings through SMBus line
transitions
Broadcast timers are set
correctly on high transition of
SMBus lines. The timers are
set to 10 seconds on high
transition of SMBus lines.
Broadcast timer accurate
regardless of CC offset
calibration or entry to sleep
bq20z80-V101
Feature not available
COMMENTS
Improved information access
Feature not available
Improved customization
Broadcast timer accuracy required a Improved broadcast timing
CC offset calibration and entry to accuracy to meet Smart Battery
sleep.
Data spec
bq20z80 to bq20z80-V101 Changes
CHANGE
Added authentication (optional SBS
command 0x2f)
Added Cell Balancing
Added charge fault FET Enable
register
Added pulse compensation for end of
discharge
Added SBS.BatteryStatus( ) [TDA,
FD] voltage thresholds
Added option for LEDs in series with
current source
Configured pin 7 as active high fuse
blow
Added State of Health calculation
(command 0x4f)
Added Synchronization of
SBS.RemainingCapacity( ) to
SBS.FullChargeCapcity( ) at charge
taper termination.
Improved thermal model
Improved cell capacity measurement
by limiting valid temperature ranges
Improved cell capacity measurement
Improved default resistance tables
bq20z80
bq20z80-V101
COMMENTS
Command 0x2f has no function and is
not acknowledged.
Command 0x2f is the
SBS.Authenticate( ) command to the
bq20z80 to begin the SHA1
authentication.
Additional feature to enable host to
authenticate the battery
Cell balancing not available
Added State of Charge cell balancing Additional feature to enable longer
algorithm
lifetime of battery
When charge faults occur, FET action When charge faults occur, FET action Adds flexibility to system interaction
is taken.
is taken if enabled in DF:FET Enable
register.
Applications with pulsed current loads
and minimum voltage requirements
can have less RemainingCapacity
than reported.
The voltage pulses caused by pulsed Added additional feature to improve
current loads are measured and used capacity prediction
to better estimate RemainingCapacity.
SBS.BatteryStatus( ) [TDA, FD] are
only set on SBS.RSOC, detection of
charge termination or faults
SBS.BatteryStatus( ) [TDA, FD] are
now set and cleared based on
SBS.Voltage( )
Adds flexibility to system interaction
LED display is only in parallel.
LED display is available in series
(with current source) or parallel.
Adds capability for higher brightness
LEDs
Pin 7 is not connected.
Pin 7 is now an active high reflection
of SAFE (pin 12).
Adds flexibility to choose different
circuits driven by the permanent
failure signal
Command 0x4f has no function and is
not acknowledged.
Command 0x4f is the
SBS.StateOfHealth( ) command
where SOH is the ratio of
SBS.DesignCapacity( ) to
SBS.FullChargeCapacity( ).
Additional feature to allow host to
easily determine health of the battery
SBS.RemainingCapacity( ) is not
affected and could be < 100% at
charge termination.
If DF:Operation Cfg [RMFCC] is set
then SBS.RemainingCapacity( ) is
updated to the value of
SBS.FullChargeCapcity( ) at charge
termination.
Adds option to enable charge
synchronization in order to display
RelativeStateOfCharge as 100% at
charge termination
A preliminary thermal mode was
used.
An updated thermal model is used.
Improved thermal compensation of
Impedance Track™ algorithm
Valid voltage measurements for cell
capacity estimation can occur at any
temperature.
Valid voltage measurements for cell Improves capacity estimation
capacity estimation must occur within
a defined temperature range.
After a full reset, it may take several
minutes for voltage reading to settle
to the most accurate reading.
Settling time of voltage
measurements after a full reset is
reduced.
Improves initial voltage reading
accuracy
A preliminary default resistance mode An updated default resistance mode Improved thermal accuracy of
was used.
is used.
Impedance Track™ algorithm
16
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