BQ27505-J2 Datasheet, PDF (23/42 Pages) Texas Instruments – System-Side Impedance Track™ Fuel Gauge

bq27505-J2
www.ti.com
System-Side Impedance Track™ Fuel Gauge
SLUS924 – APRIL 2009
Class
Gas Gauging
Gas Gauging
Gas Gauging
Gas Gauging
Subclass
ID
80
80
80
80
Table 4-7. Data Flash Summary (continued)
Subclass
IT Cfg
IT Cfg
IT Cfg
IT Cfg
Offset
Name
55 User Rate-mA
57 User Rate-mW
59 Reserve Cap-mAh
61 Reserve Cap-mWh
Data
Type
I2
I2
I2
I2
Min
Value
–2000
–7200
0
0
Max
Value
–100
–350
9000
14,000
Default
Value
0
0
0
0
Units
mA
mW
mAh
mWh
Gas Gauging
81
Current
Thresholds
0
Dsg Current Threshold
Gas Gauging
81
Current
Thresholds
2
Chg Current Threshold
Gas Gauging
81
Current
Thresholds
4
Quit Current
Gas Gauging
81
Current
Thresholds
6
Dsg Relax Time
Gas Gauging
81
Current
Thresholds
8
Chg Relax Time
Gas Gauging
81
Current
Thresholds
9
Quit Relax Time
I2
0
I2
0
I2
0
U2
0
U1
0
U1
0
2000
2000
1000
8191
255
63
60
mA
75
mA
40
mA
60
s
60
s
1
s
Gas Gauging
82
Gas Gauging
82
Gas Gauging
82
Gas Gauging
82
Gas Gauging
82
Gas Gauging
82
Gas Gauging
82
Gas Gauging
82
Gas Gauging
82
Gas Gauging
82
Gas Gauging
82
Gas Gauging
82
Calibration
104
Calibration
104
Calibration
104
Calibration
104
Calibration
104
Calibration
104
Calibration
104
Calibration
104
State
State
State
State
State
State
State
State
State
State
State
State
Data
Data
Data
Data
Data
Data
Data
Data
0
IT Enable
1
Application Status
2
Qmax 0
4
Cycle Count 0
6
Update Status 0
7
Qmax 1
9
Cycle Count 1
11 Update Status 1
12 Cell0 Chg dod
14 Cell1 Chg dod at EoC
16 Avg I Last Run
18 Avg P Last Run
0
CC Gain
4
CC Delta
8
CC Offset
10 ADC Offset
12 Board Offset
13 Int Temp Offset
14 Ext Temp Offset
15 Pack V Offset
H1
H1
I2
U2
H1
I2
U2
H1
I2
I2
I2
I2
F4 ⁽²⁾
F4 ⁽²⁾
I2
I2
I1
I1
I1
I1
0x00
0x00
0
0
0x00
0
0
0x00
0
0
–32,768
–32,768
0.1
4.7
–2.4
–500
–128
–128
–128
–128
0x03
0xff
32,767
65,535
0x03
32767
65,535
0x03
16384
16384
32,767
32,767
47
188
2.4
500
127
127
127
127
0x00
0x00
1000
0
0x00
1000
0
0x00
0
0
–299
–1131
10 ⁽¹⁾
10 ⁽¹⁾
–0.088 ⁽¹⁾
0
0
0
0
0
–
–
mAh
–
–
mAh
Count
–
–
–
mA
mAh
mohm
mohm
mV
mV
mV
0.1°C
0.1°C
mV
Calibration
107
Current
1
Deadband
U1
0
255
5
mA
Security
112
Security
112
Security
112
Security
112
(2) Not IEEE floating point.
Codes
Codes
Codes
Codes
0
Unseal Key 0
2
Unseal Key 1
4
Full-Access Key 0
6
Full-Access Key 1
H2
0x0000
0xffff
0x3672
–
H2
0x0000
0xffff
0x0414
–
H2
0x0000
0xffff
0xffff
–
H2
0x0000
0xffff
0xffff
–
5 FUNCTIONAL DESCRIPTION
5.1 FUEL GAUGING
The bq27505 measures the cell voltage, temperature, and current to determine battery SOC. The
bq27505 monitors charge and discharge activity by sensing the voltage across a small-value resistor
(5 mΩ to 20 mΩ typ.) between the SRP and SRN pins and in series with the cell. By integrating charge
passing through the battery, the battery’s SOC is adjusted during battery charge or discharge.
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FUNCTIONAL DESCRIPTION
23