BQ20Z80-V102_07 Datasheet, PDF (22/28 Pages) Texas Instruments – SBS 1.1-COMPLIANT GAS GAUGE ENABLED WITH IMPEDANCE TRACK TM TECHNOLOGY FOR USE WITH THE BQ29312A

bq20z80-V102
SLUS681B – NOVEMBER 2005 – REVISED JANUARY 2007
www.ti.com
Table 4. CHANGE DETAILS (continued)
CHANGE
bq0z80-V102
Correct update of Remcap in Charge or discharge current
relaxed state to use passed accumulated in a relaxed state
charge
used to update Remcap
Implement disable of
resistance update based on
accumulative scale. If the
product of 15 consecutive
(default value) resistance
scale factors is less than 0.5
or more than 1.5, then
resistance update is disabled
until the next valid soc
measurement. Sets bit 2 of
Operation Status to indicate
resistance update disabled.
Prevent invalid soc values from
causing incorrect resistance
updates
Implement disable of
Prevent invalid soc values from
resistance update based on causing incorrect resistance
estimated capacity error.
updates
Sets bit 2 of Operation Status
to indicate resistance update
disabled.
Disable Qmax increment if
due to Grid 14 and exit of
discharge
Prevent unnecessary Qmax
increments
Drive all unused pins low
Provides better ESD immunity
Initial charge capacity
calculation when dod0 is
measured in the
overdischarged state is
corrected
Overdischarged state does not
affect the accuracy of FCC
calculations
Correct calculation of FCC
and RemCap when dod0 is
taken when the battery is
overdischarged or
overcharged. This allows
RemCap to go negative, or
greater than FCC (though is
only reported from 0 - FCC).
Overcharged/Overdischarged
does not affect the accuracy of
FCC and RemCap calculations
Change cell imbalance
DF:Battery Rest Time from 1
byte to 2 bytes and set the
default value to 1800
seconds
New feature providing improved
customization
Use upper and lower limit for
resistance accumulative
scale. Set default values to
300% and 30%.
Add DF:CF MaxError limit for
setting SBS.BatteryMode( )
[CONDITION FLAG]. Set
default value to 100%.
New feature providing improved
customization
bq20z80-V101
COMMENTS
If the relaxed state was exited after More reliable
the accumulation of significant
SBS:FullChargeCapacity( )
charge or discharge current (over at SBS:RemainingCapacity( )
most 100 seconds with default
calculation under all system
values), the RemCap and FCC
conditions
would be in error by this charge.
This is only significant if the relaxed
state can exist with significant
current as determined by application
settings.
Incorrect resistance updates that More reliable resistance updates
could result from invalid soc values under all system conditions
Incorrect resistance updates that More reliable resistance updates
could result from invalid soc values under all system conditions
Qmax increments can occur due to Improved Qmax data reliability
Grid 14 and exit of discharge
under all system conditions.
Not all unused pins driven low
Improved ESD immunity
An incorrect initial charge capacity
affects FCC that is calculated during
discharge or a Qmax update. If FCC
is not changed by a Qmax update,
then reported RemainingCapacity
could be negative after 5 hours of
relaxation
More reliable
SBS:FullChargeCapacity( )
SBS:RemainingCapacity( )
calculation under all system
conditions
The RemainingCapacity will
increment (or decrement) during
charging (discharging) even when
the battery is in an overdischarged
(overcharged) state.
More reliable
SBS:FullChargeCapacity( )
SBS:RemainingCapacity( )
calculation under all system
conditions
Feature not available
Improved customization for Cell
Imbalance detection
Feature not available
More reliable resistance updates
under all system conditions
Improved customization
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