Datasheet

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