BQ2060SS Datasheet, PDF (45/59 Pages) Texas Instruments – SBS V1.1-COMPLIANT GAS GAUGE IC

bq2060
www.ti.com
SLUS035E – JANUARY 2000 – REVISED OCTOBER 2005
EEPROM PROGRAMMING (continued)
When fast charge is allowed, the bq2060 sets ChargingCurrent() to the rate programmed in Fast Charging
Current EE 0x1a-0x1b.
When fast charge terminates, the bq2060 sets ChargingCurrent() to zero and then to the Maintenance Charging
Current EE 0x1c-0x1d when the termination condition ceases.
When Voltage() is less than EDV0, the bq2060 sets ChargingCurrent() to Pre-charge Current EE 0x1e-0x1f.
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.
Fast Charging Current, Maintenance Charging Current, and Pre-Charge Current are stored in mA.
Charge Suspension
During charge, the bq2060 compares the current to the ChargingCurrent() plus the value IOIM. If the pack is
charged at a current above the ChargingCurrent() plus IOIM, the bq2060 sets ChargingCurrent() to zero to stop
charging. IOIM is programmed in the EEPROM value, Overcurrent Margin, encoded as
Overcurrent
Margin
+
IOIM
16
(20)
Overcurrent Margin EE 0x49 may be used to program IOIM values of 0 to 4080 mA in 16-mA steps.
The desired temperature threshold for charge suspension, MAXTEMP, may be programmed between 45°C and
69°C in 1.6°C steps. MaxT DeltaT EE 0x45 (most significant nibble) is stored in a 4-bit value as shown:
ƪ ƫ MaxT +
69 * MAXTEMP
1.6
(21)
The bq2060 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 bq2060 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 bq2060 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 is stored in Fast Charge Termination % in EE 0x4b. The value is
stored in 2s complement of percent.
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.
45