bq20z80-V101
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SLUS625D–SEPTEMBER 2004–REVISED OCTOBER 2005
DF:Min Cell Deviation = (500 + (2 x Rχ) Ω) / 0.4*3.6V, giving a default of 1750.
SIZE
(BYTES)
DEFAULT
VALUE
NAME
CLASS / SUBCLASS
FORMAT
VALID RANGE
UNITS
Min Cell Deviation Charge Control / Cell Balancing (37)
Integer
0 to 65535
2
s/mAh
1750
Primary Charge Termination
The bq20z80 determines charge termination when the average SBS.Current( ) during 2 consecutive periods of
DF:Current Taper Window is < DF:Taper Current AND during the 2 consecutive periods of DF:Current Taper
Window the accumulated change in capacity must be > 0.25mAh. If DF:TCA_Set = -1 the SBS.BatteryStaus(
)[TCA] will be set when charge termination is detected. If DF:FC_Set = -1 the SBS.BatteryStaus( )[FC] will be set
when charge termination is detected. If DF:Operation Cfg B [CHGFET] is set, the CHG FET is also turned off.
For a valid charge termination to occur SBS.Voltage( )+ DF:Termination Voltage must also be ≥ DF:Fast Charge
Voltage.
When charge termination is detected and if DF:TCA_Set = -1, SBS.ChargingStatus( ) [MCHG] is set, and
SBS.ChargingCurrent( ) is set to DF:Maintenance Charge Current.
If DF:Operation Cfg B [CSYNC] is set then SBS.RemainingCapacity( ) is updated with the value in
SBS.FullChargeCapacity( ) regardless of the setting of DF:TCA_Set.
SBS.BatteryStatus( ) [FC] is cleared and SBS.ChargingCurrent( ) is set to the appropriate value for battery
conditions when SBS.RelativeStateOfCharge( ) is < DF:FC Clear %.
SBS.BatteryStatus( ) [TCA] is also cleared, and SBS.ChargingCurrent( ) is set to the appropriate value for battery
conditions when DF:Operation Cfg B [CHGTERM] is set, AND SBS.Current( ) is < DF:Chg Current Threshold for
two consecutive periods of DF:Current Taper Window.
SIZE
(BYTES)
DEFAULT
VALUE
NAME
CLASS / SUBCLASS
FORMAT
VALID RANGE
UNITS
Maintenance Charge Current
Taper Current
0 to 1000
0 to 1000
0 to 1000
0 to 60
2
2
2
1
0
mA
250
300
40
Charge Control /
Termination Config. (36)
Integer
Termination Voltage
Current Taper Window
mV
s
Charge Control SMBus Broadcasts
All broadcasts are enabled by setting DF:Operation Cfg B [BCAST]. If DF:Operation Cfg B [HPE] is set, the
Master-Mode broadcasts to the Host address have PEC enabled, and if DF:Operation Cfg B [CPE] is set, the
Master-Mode broadcasts to the Smart-Charger address have PEC enabled.
If enabled, SBS.ChargingVoltage( ) and SBS.ChargingCurrent( ) is broadcast to the Smart-Charger address
between every 10 and 60 seconds.
If enabled, SBS.AlarmWarning( ) is broadcast to the Host address every 10 seconds, only while any of the
SBS.BatteryStatus( ), bits 8 -15, are set. Broadcasting stops when SBS.BatteryStatus( ), 8-15, are clear.
If enabled, SBS.AlarmWarning( ) is broadcast to the Smart Charger address every 10 seconds only when any of
SBS.BatteryStatus( ), bits 11 -15. Broadcasting stops when SBS.BatteryStatus( ), 11-15, are clear.
Charging Faults
Charge Fault Cfg
CHARGE FAULT Fault
CONFIGURATION
bit7
bit6
bit5
bit4
bit3
bit2
bi1
bit0
Low Byte
–
–
PCMTO
FCMTO
OCHGV
OCHGI
OC
XCHGLV
61
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