BQ2063_15 Datasheet, PDF (48/60 Pages) Texas Instruments – SBS v1.1-COMPLIANT Li-ION GAS-GAUGE IC

bq2063
Not Recommended For New Designs
SBS v1.1ĆCOMPLIANT LiĆION GASĆGAUGE IC
WITH PROTECTOR INTERFACE
SLUS468E− MAY 2001 − REVISED APRIL 2002
PROGRAMMING INFORMATION
charging current (continued)
When fast charge terminates, the bq2063 sets ChargingCurrent( ) to zero and then to the Maintenance
Charging Current EE 0x1d when the termination condition ceases. MC is the desired rate in mA.
Maintenance
Charging
Current
+
MC
4
(16)
When Voltage( ) is less than EDV0, the bq2063 sets ChargingCurrent( ) to Precharge Current EE 0x1e.
Typically this rate is larger than the maintenance rate to charge a deeply depleted pack up to the point where
it may be fast charged. PCC is the desired rate in mA.
Precharge
Current
+
PCC
8
(17)
If temperature is between 0° and the LTF threshold, the bq2063 sets ChargingCurrent( ) to PreCharge Current.
LTF is programmed in the lower nibble (LSN) OF MaxTLowT EE0x45 as
LowT
+
LTF(°C)
0.8
(18)
charge suspension
During charge, the bq2063 compares the current to the ChargingCurrent( ) plus the value IOIM. If the pack is
charged at a current above the ChargingCurrent( ) plus IOIM, the bq2063 sets ChargingCurrent( ) to zero to
stop charging. IOIM is programmed in the EE 0x49 value, Overcurrent Margin, encoded as
Overcurrent
Margin
+
IOIM
16
(19)
Overcurrent Margin EE 0x49 may be used to program IOIM values of 0 to 4080mA in 16mA steps.
The desired temperature threshold for charge suspension, MAXTEMP, may be programmed between 45°C and
69°C in 1.6°C steps. MaxT LowT EE 0x45 (MSN) is stored in a 4-bit value as shown:
MaxT +
69–MAXTEMP
1.6
(20)
The bq2063 suspends fast charge when fast charge continues past full by the amount programmed in Maximum
Overcharge EE 0x2e-0x2f. Maximum Overcharge is programmed in 2s complement form of charge in mAh.
FULLY_CHARGED bit clear threshold
The bq2063 clears the FULLY_CHARGED bit in BatteryStatus( ) when RelativeStateOfCharge( ) reaches the
value, Fully Charged Clear % EE 0x4c. Fully Charged Clear % is an 8-bit value and is stored as a 2s complement
of percent.
fast charge termination percentage
The bq2063 sets RM to a percentage of FCC on charge termination if the CSYNC bit is set in the Pack
Configuration register. The percentage of FCC, FCT%, is stored in Fast Charge Termination % in EE 0x4b. The
value is stored as shown:
Fast Charge Termination% = (FCT% _* 2.56−1)
cycle count threshold
Cycle Count Threshold 0x3c-0x3d sets the number of mAh that must be removed from the battery to increment
CycleCount( ). Cycle Count Threshold is a 16-bit value stored in 2s complement of charge in mAh.
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