BQ20Z80ADBTR Datasheet, PDF (14/25 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
bq20z80-V101
COMMENTS
Allow negative LED
thresholds to permit LED
alarms to be disabled
Configuring negative LED alarm
threshold disables LED alarm
functionality.
Feature not available
Allow better customization
Allow zero values for ALARM Configuring zero value for the
and CHARGING LED blink LED blink rates disables them.
rates to disable them
Feature not available
Allow better customization
Restore initialization of
dodcharge initialized to the
dodcharge in relaxed state correct value
so that the correct dodcharge
value is used in capacity
estimation
dodcharge value set to zero
Improved gauging accuracy with
correct initialization of dodcharge
value.
Only clear offset calibration
flag when SMBus lines go
high.
Prevents offset calibration
occurring just because a safety
condition occurs and then clears
when the SMBus lines are low.
Offset calibration occurs multiple
times if safety condition occurs
when SMBus lines are low.
More appropriate period between
offset calibrations when SMBus
lines are low.
Change so that setting AFE
Fail Limit to zero disables
PF_AFE_C
Configurable option to allow
disabling PF_AFE_C trigger
Feature not available.
Allow better customization
Enable LED display to turn
off after charge termination
and if SMBus lines are
detected low and LEDs
enabled during charging.
LED display turns off after charge LED display stays on when charging Correct operation of the LED
termination.
terminates after SMBus lines are display under all conditions
detected low.
Set charge FET state
immediately when entering
sleep
Charge FET state set correctly,
immediately after entering sleep
The CHG FET would not get set to
the correct state for sleep until the
first voltage measurement.
Quicker transition of FET to the
correct state in sleep
Change DF:Operation Cfg B
[CCT = 0], so that
SBS.CycleCount( ) threshold
is in mAH, not in % of FCC
Data flash default bases
SBS.CycleCount( ) calculation on
mAh and not % of FCC
DF:Operation Cfg B [CCT = 1],
making the default
SBS.CycleCount( ) calculation to be
based on % of FCC
Data flash default changed to
reflect common customer usage
When DF:Operation Cfg B
[CCT = 1], so that
SBS.CycleCount( ) threshold
is % of FCC, then DF:CC
Threshold is used as a
minimum for the
SBS.CycleCount( ) threshold
Use DF:CC Threshold as the
minimum to prevent rapid
incrementing of the
SBS.Cyclecount( ), damaging the
data flash
Small or negative SBS.Full Charge
Capacity( ) values (should not occur
under normal operation) from
causing the SBS.CycleCount( )
incrementing rapidly, potentially
damaging the data flash
Improved system reliability
When exiting the relaxed
state to sleep, the initial
charge capacity is correctly
calculated
Corrected initial charge capacity
calculation to be accurate when
exiting relaxed state to sleep
If the relaxed state was exited to
More reliable
sleep after a valid DOD
SBS:FullChargeCapacity( )
measurement (30-minute default
calculation under all system
value), then the initial charge
conditions
capacity would not be recalculated
and would result in an incorrect FCC
value if the sleep state was exited
before another valid DOD
measurement (30-minute default
value)
Correct update of Remcap in Charge or discharge current
relaxed state to use passed accumulated in a relaxed state
charge
used to update Remcap
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.
14
Submit Documentation Feedback