BQ2060A_15 Datasheet, PDF (46/61 Pages) Texas Instruments – SBS v1.1-Compliant Gas Gauge IC

bq2060A
SLUS500D – OCTOBER 2001 – REVISED OCTOBER 2011
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When fast charge terminates, the bq2060A 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 bq2060A 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 bq2060A compares the current to the ChargingCurrent() plus the value IOIM. If the pack is
charged at a current above the ChargingCurrent() plus IOIM, the bq2060A sets ChargingCurrent() to zero to stop
charging. IOIM is programmed in the EEPROM value, Overcurrent Margin, encoded as follows:
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. Charge-suspension temperature is increased by 16° above the programmed value of MaxT
if bit 5 in Miscellaneous Option EE 0x08 is set. MaxT DeltaT EE 0x45 (most significant nibble) is stored in a 4-bit
value as shown:
MaxT
=
é 69 - MAXTEMP ù
êë
1.6
úû
(21)
The bq2060A 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 bq2060A 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 bq2060A 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.
ΔT/Δt Rate Programming
The ΔT portion of the ΔT/Δt rate is programmed in DeltaT, the low nibble of MaxT DeltaT EE 0x45 (least
significant nibble). The Δ portion is programmed in DeltaT Time EE 0x4e.
ƪ ƫ DTńDt
+
[DeltaT
[320 *
2 ) 16]ń10
DeltaT 20]
°C
s
(22)
DeltaT
0
1
2
Table 11.
Δ(°C)
DeltaT_Time
t (s)
1.6
00
320
1.8
01
300
2.0
02
280
46
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