BQ2060A_15 Datasheet, PDF (40/61 Pages) Texas Instruments – SBS v1.1-Compliant Gas Gauge IC

bq2060A
SLUS500D – OCTOBER 2001 – REVISED OCTOBER 2011
www.ti.com
The 16-bit VFC Sense Resistor Gain in EE 0x6a–0x6b scales each VFC interrupt to mAh. VFC Sense Resistor
Gain is based on the resistance of the series sense resistor. The following formula computes a nominal or
starting value for VFC Sense Resistor Gain from the sense resistor value.
VFC
Sense
Resistor
Gain
+
409.6
(R_s)
(5)
Sense resistor values are limited to the range of 0.00954 to 0.100 Ω.
Digital Filter
The digital filter threshold, VDF (µV), is set by the value stored in Digital Filter EE 0x52.
Digital
Filter
+
2250
VDF
(6)
Cell Characteristics
Battery Pack Capacity and Voltage
Pack capacity in mAh units is stored in Pack Capacity EE 0x3a–0x3b. In mAh mode, the bq2060A copies Pack
Capacity to DesignCapacity(). In mWh mode, the bq2060A multiplies Pack Capacity by Design Voltage EE
0x12–0x13 to calculate DesignCapacity() scaled to 10 mWh. Design Voltage is stored in mV.
The initial value for Last Measured Discharge in mAh is stored in EE 0x38–0x39. Last Measured Discharge is
modified over the course of pack usage to reflect cell aging under the particular use conditions. The bq2060A
updates Last Measured Discharge in mAh after a capacity learning cycle. The bq2060A uses the Last Measured
Discharge value to calculate FullChargeCapacity() in mAh or 10 mWh mode.
Table 10. EEPROM Memory Map
EEPROM
Address
Name
0x00
0x02
0x04
0x06
0x07
0x08
0x09
0x0a
0x0c
0x0e
0x10
0x12
0x14
0x16
0x18
0x1a
0x1c
0x1e
0x20
0x21
0x22
0x23
0x24
0x25
0x01
0x03
0x05
0x0b
0x0d
0x0f
0x11
0x13
0x15
0x17
0x19
0x1b
0x1d
0x1f
Check Byte 1
Remaining Time Alarm
Remaining Capacity Alarm
EDV A0 Impedance Age Factor
EDV TC Cold Impedance Factor
Misc Options
Safety Overtemperature
Charging Voltage
Reserved
Cycle Count
Reserved
Design Voltage
Specification Information
Manufacture Date
Serial Number
Fast-Charging Current
Maintenance Charging Current
Pre-Charge Current
Manufacturer Name Length
Character 1
Character 2
Character 3
Character 4
Character 5
Chemistry
Li-Ion, nickel
Li-Ion, nickel
Li-Ion, nickel
Li-Ion, nickel
—
—
—
Li-Ion, nickel
—
Li-Ion, nickel
—
Li-Ion, nickel
Li-Ion, nickel
Li-Ion, nickel
Li-Ion, nickel
Li-Ion, nickel
Li-Ion, nickel
Li-Ion, nickel
Li-Ion, nickel
Li-Ion, nickel
Li-Ion, nickel
Li-Ion, nickel
Li-Ion, nickel
Li-Ion, nickel
NiMH
Example
15487
10 minutes
350 mAh
0
0
0
0
18000 mV
128
0
0
12000 mV
v1.1/PEC
2/25/99=9817
1
4000 mA
200 mA
800 mA
9
B
E
N
C
H
Data
MSB LSB
3c
7f
00
0a
01
5e
—
00
—
00
—
00
—
00
46
50
00
80
00
00
00
00
2e
e0
00
31
26
59
00
01
0f
a0
00
c8
03
20
—
09
—
42
—
45
—
4e
—
43
—
48
Li-Ion
Example
15487
10 minutes
400 mAh
0
3
0
0
12600 mV
128
0
0
10800 mV
v1.1/PEC
2/25/99=9817
1
3000 mA
0 mA
100 mA
9
B
E
N
C
H
Data
MSB LSB
3c
7f
00
0a
01
90
—
00
—
03
—
00
—
00
31
38
00
80
00
00
00
00
2a
30
00
31
26
59
00
01
0b
b8
00
00
00
64
—
09
—
42
—
45
—
4e
—
43
—
48
40
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