BQ2060A_15 Datasheet, PDF (14/61 Pages) Texas Instruments – SBS v1.1-Compliant Gas Gauge IC

bq2060A
SLUS500D – OCTOBER 2001 – REVISED OCTOBER 2011
1200
1000
15°C
800
600
25°C
400
200
0
0
35°C
45°C
10 20 30 40 50 60 70
t − Time − days
Figure 7. Self-Discharge at 2.5%/Day at 25°C
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Midrange Capacity Corrections
The bq2060A applies midrange capacity corrections when the VCOR bit is set in Pack Configuration. The
bq2060A adjusts RM to the associated percentage at three different voltage levels VOC25, VOC50, and VOC75.
The VOC values represent the open-circuit battery voltage at which RM corresponds to the associated state of
charge for each threshold.
THRESHOLD
VOC25
VOC50
VOC75
ASSOCIATED STATE OF CHARGE
25%
50%
75%
For the midrange corrections to occur, the temperature must be in the range of 19°C to 31°C inclusive and the
Current() and AverageCurrent() must both be between –64 mA and 0. For a correction to occur, the bq2060A
must also detect the need for correction during two adjacent measurements separated by 20 s. The second
measurement is not required if the first measurement occurs immediately after a device reset. The bq2060A
makes midrange corrections as shown in Table 5.
Charge Control
Charging Voltage and Current Broadcasts
The bq2060A supports SBS charge control by broadcasting the ChargingCurrent() and ChargingVoltage() to the
Smart Charger address. The bq2060A broadcasts the requests every 10 s. The bq2060A updates the values
used in the charging current and voltage broadcasts based on the battery state of charge, voltage, and
temperature. The fast-charge rate is programmed in Fast-Charging Current EE 0x1a–0x1b while the charge
voltage is programmed in Charging Voltage EE 0x0a–0x0b.
The bq2060A internal charge control is compatible with popular rechargeable chemistries. The primary
charge-termination techniques include a change in temperature over a change in time (ΔT/Δt) and current taper,
for nickel-based and Li-ion chemistries, respectively. The bq2060A also provides pre-charge qualification and a
number of safety charge suspensions based on current, voltage, temperature, and state of charge.
Alarm Broadcasts to Smart Charger and Host
If any of the bits 8–15 in BatteryStatus() is set, the bq2060A broadcasts an AlarmWarning() message to the host
address. If any of the bits 12–15 in BatteryStatus() is set, the bq2060A also sends an AlarmWarning() message
to the Smart Charger address. The bq2060A repeats the AlarmWarning() message every 10 s until the bits are
cleared.
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