BQ27505-J3 Datasheet, PDF (23/44 Pages) Texas Instruments – System-Side Impedance Track™ Fuel Gauge

Not Recommended for New Designs
bq27505-J3
www.ti.com
SLUS986A – OCTOBER 2009 – REVISED FEBRUARY 2010
Class
Gas Gauging
Gas Gauging
Gas Gauging
Gas Gauging
Gas Gauging
Gas Gauging
Subclass
ID
80
80
80
80
80
80
Table 4-7. Data Flash Summary (continued)
Subclass
IT Cfg
IT Cfg
IT Cfg
IT Cfg
IT Cfg
IT Cfg
Offset
Name
50 Terminate Voltage
55 User Rate-mA
57 User Rate-mW
59 Reserve Cap-mAh
61 Reserve Cap-mWh
66 MinDeltaVoltage
Data
Type
I2
I2
I2
I2
I2
I2
Min
Value
–32,768
–2000
–7200
0
0
4
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
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
State
State
State
State
State
State
State
State
State
State
State
State
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
H1
0x00
H1
0x00
I2
0
U2
0
H1
0x00
I2
0
U2
0
H1
0x00
I2
0
I2
0
I2
–32,768
I2
–32,768
Calibration
104
Calibration
104
Calibration
104
Calibration
104
Calibration
104
Calibration
104
Calibration
104
Calibration
104
Data
Data
Data
Data
Data
Data
Data
Data
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
F4 ⁽²⁾
F4 ⁽²⁾
I2
I2
I1
I1
I1
I1
0.1
4.7
–2.4
–500
–128
–128
–128
–128
Calibration
107
Current
1
Deadband
U1
0
Security
112
Codes
0
Unseal Key 0
Security
112
Codes
2
Unseal Key 1
Security
112
Codes
4
Full-Access Key 0
Security
112
Codes
6
Full-Access Key 1
(2) Not IEEE floating point.
(3) Display as the value EVSW displayed. Data Flash value is different.
H2
0x0000
H2
0x0000
H2
0x0000
H2
0x0000
Max
Value
32,767
–100
–350
9000
14,000
0
2000
2000
1000
8191
255
63
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
255
0xffff
0xffff
0xffff
0xffff
Default
Value
3420
0
0
0
0
15
60
75
40
60
60
1
0x00
0x00
1000
0
0x00
1000
0
0x00
0
0
–299
–1131
10 ⁽³⁾
10 ⁽³⁾
–0.088 ⁽³⁾
0
0
0
0
0
5
0x3672
0x0414
0xffff
0xffff
Units
mV
mA
mW
mAh
mWh
mV
mA
mA
mA
s
s
s
–
–
mAh
–
–
mAh
Count
–
–
–
mA
mAh
mohm
mohm
mV
mV
mV
0.1°C
0.1°C
mV
mA
–
–
–
–
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
Copyright © 2009–2010, Texas Instruments Incorporated
Submit Documentation Feedback
FUNCTIONAL DESCRIPTION
23