BQ2060SS Datasheet, PDF (48/59 Pages) Texas Instruments – SBS V1.1-COMPLIANT GAS GAUGE IC

bq2060
SLUS035E – JANUARY 2000 – REVISED OCTOBER 2005
0
The bq2060 uses nickel configuration parameters.
1
The bq2060 uses Li-ion configuration parameters
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LCC0 and LCC1
The LCC0 and LCC1 bits configure the cell voltage inputs (VCELL_1–4).
NO. OF SERIES CELLS
LCC1 LCC0
CELL VOLTAGE INPUTS
NA
00
2
01
3
10
4
11
VCELL₄= Cell Stack
VCELL₁ = Cell 1
VCELL₂ = Cell 2
VCELL₁= Cell 1
VCELL₂= Cell 2
VCELL₃= Cell 3
VCELL₁= Cell 1
VCELL₂= Cell 2
VCELL₃= Cell 3
VCELL₄= Cell 4
For Li-ion packs with individual measurements, LCC0 and LCC1 define the number of series elements and their
voltage measurement inputs. In each case (2, 3, or 4), the bq2060 uses the highest numbered cell voltage input
to measure the pack voltage measurement as returned with Voltage(). For nickel chemistries or Li-ion without
single-cell measurements, LCC0 and LCC1 must be set to 00. VCELL4 is the pack voltage input for this
programming.
Remaining Time and Capacity Alarms
Remaining Time Alarm in EE 0x02–0x03 and Remaining Capacity Alarm in 0x04–0x05 set the alarm thresholds
used in the SMBus command codes 0x01 and 0x02, respectively. Remaining Time Alarm is stored in minutes
and Remaining Capacity Alarm in mAh.
Secondary Protection Limits for Li-ion
The cell undervoltage (V_UV) and overvoltage (V_OV) limits are programmed in Cell Undervoltage/Overvoltage EE
0x4a according to the equations:
Cell
UndervoltageńOvervoltage
(lower)
+
V_OV
* 4096
32
(25)
Cell
UndervoltageńOvervoltage
(upper)
+
V_OV
* 2048
64
(26)
CELL UNDER/
OVERVOLTAGE
(UPPER NIBBLE)
0
1
2
3
4
5
6
7
8
9
a
b
V_UV(mV)
2048
2112
2176
2240
2304
2368
2432
2496
2560
2624
2688
2752
CELL UNDER/
OVER VOLTAGE
(LOWER NIBBLE)
0
1
2
3
4
5
6
7
8
9
a
b
V_OV(mV)
4096
4128
4160
4192
4224
4256
4288
4320
4352
4384
4416
4448
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