bq20z80-V101
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SLUS625D–SEPTEMBER 2004–REVISED OCTOBER 2005
Temperature If SBS.Temperature( ) is outside of the range 10°C to 40°C
Delta Capacity If the capacity change between suitable battery rest periods is less than 37%
Voltage
If and SBS.CellVoltage1..4( ) is within the range of 3737mV and 3800mV
Discharge and Charge Alarms
The bq20z80 enables SBS.BatteryStatus( ) [TDA, FD, TCA, FC] flags to be set or cleared on the following
thresholds based on SBS.RelativeStateOfCharge( ).
DF:Operation Cfg A
CONDITION
SBS.BatteryStatus( ) FLAG ACTION
[DMODE] = 0
[DMODE] = 1
≤ DF:TDA Set %
≥ DF:TDA Clear %
≤ DF:FD Set %
Terminate_Discharge_Alarm is set
Terminate_discharge_Alarm is cleared
Fully_Discharged is set
≥ DF:FD Clear %
≥ DF:TCA Set %
≤ DF:TCA Clear %
≥ DF:FC Set %
Fully_Discharged is cleared
Terminate_Charge_Alarm is set
Terminate_Charge_Alarm is cleared
Fully_Charged is set
SBS.RelativeStateOfCharge( )
SBS.AbsoluteOfCharge( )
≤ DF:FC Clear %
Fully_Charged is cleared
The SBS.RelativeStateOfCharge( ) or SBS.AbsoluteStateOfCharge( ) based thresholds can be disabled by
setting the value to -1%.
The SBS.BatteryStatus( ) [TDA, FD] flags can also be set or cleared based on the level of SBS.Voltage( ). If the
voltage settings are not used then they should be set to extreme range values.
CONDITION
≤ DF:TDA Volt Threshold for a period of DF:TDA Volt Time
≥ DF:TDA Recovery
SBS.BatteryStatus( ) FLAG ACTION
Terminate_Discharge_Alarm is set
Terminate_discharge_Alarm is cleared
Fully_Discharged is set
SBS.Voltage( )
≤ DF:FD Volt Threshold for a period of DF:FD Volt Time
≥ DF:FD Recovery
Fully_Discharged is cleared
See the Charge Termination and Protection sections of this data sheet for further details on the setting of
Terminate_Charge_Alarm.
VALID
RANGE
SIZE
(BYTES)
DEFAULT
VALUE
NAME
CLASS / SUBCLASS
FORMAT
UNITS
TDA Set %(1)
TDA Clear%(1)
FD Set %(1)
6
8
2
FD Clear %(1)
TCA Set %(1)
TCA Clear %(1)
FC Set %(1)
5
Integer
-1 to 100
1
%
-1
95
-1
SBS Configuration / Config (49)
FC Clear %(1)
TDA Volt Threshold
TDA Volt Time
TDA Recovery
FD Volt Threshold
FD Volt Time
98
5000
5
0 to 16000
0 to 60
2
1
2
2
1
2
mV
s
0 to 16000
0 to 16000
0 to 60
mV
mV
s
5500
5000
5
Integer
FD Recovery
0 to 16000
mV
5000
(1) Setting to –1% prevents the TDA, TCA, FD, or FC flag from being set or cleared based on state of charge.
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