BQ27500_08 Datasheet, PDF (18/39 Pages) Texas Instruments – System-Side Impedance Track™ Fuel Gauge

bq27500
bq27501
System-Side Impedance Track™ Fuel Gauge
SLUS785D – SEPTEMBER 2007 – REVISED APRIL 2008
www.ti.com
When in SEALED mode, the CONTROL_STATUS [SS] bit is set, but when the unseal keys are correctly
received by the bq27500/1, the [SS] bit is cleared. When the full-access keys are correctly received, then
the CONTROL_STATUS [FAS] bit is cleared.
Both the sets of keys for each level are 2 bytes each in length and are stored in data flash. The unseal
key (stored at Unseal Key 0 and Unseal Key 1) and the full-access key (stored at Full-Access Key 0
and Full-Access Key 1) can only be updated when in FULL-ACCESS mode. The order of the bytes
entered through the Control( ) command is the reverse of what is read from the part. For example, if the
first and second words of the Unseal Key 0 read returns 0x1234 and 0x5678, then the Control( ) should
supply 0x3412 and 0x7856 to unseal the part.
4.6 DATA FLASH SUMMARY
Table 4-7 summarizes the data flash locations available to the user, including their default, minimum, and
maximum values.
Class
Configuration
Configuration
Configuration
Configuration
Configuration
Configuration
Configuration
Configuration
Configuration
Configuration
Configuration
Configuration
Configuration
Configuration
Configuration
Configuration
Configuration
Configuration
Configuration
Configuration
Configuration
Subclass
ID
2
2
2
2
2
2
Subclass
Safety
Safety
Safety
Safety
Safety
Safety
32
Charge Inhibit
Config
32
Charge Inhibit
Config
32
Charge Inhibit
Config
34
Charge
34
Charge
34
Charge
34
Charge
36
Charge
Termination
36
Charge
Termination
36
Charge
Termination
36
Charge
Termination
48
Data
48
Data
48
Data
48
Data
Table 4-7. Data Flash Summary
Offset
Name
0
OT Chg
2
OT Chg Time
3
OT Chg Recovery
5
OT Dsg
7
OT Dsg Time
8
OT Dsg Recovery
Data
Type
I2
U1
I2
I2
U1
I2
0
Charge Inhibit Temp Low
I2
2
Charge Inhibit Temp High
I2
4
Temp Hys
I2
2
Charging Voltage
I2
4
Delta Temperature
I2
6
Suspend Temperature Low
I2
8
Suspend Temperature High
I2
2
Taper Current
I2
4
Minimum Taper Charge
I2
6
Taper Voltage
I2
8
Current Taper Window
U1
4
Initial Standby Current
I1
5
Initial Max Load Current
I2
7
CC Threshold
I2
10 Design Capacity
I2
Min
Value
0
0
0
0
0
0
–400
–400
0
0
0
–400
–400
0
0
0
0
–128
–32,767
100
0
Configuration
48
Data
12 Device Name
S8
x
Configuration
Configuration
Configuration
Configuration
System Data
49
Discharge
0
SOC1 Set Threshold
49
Discharge
1
SOC1 Clear Threshold
49
Discharge
2
SOCF Set Threshold
49
Discharge
3
SOCF Clear Threshold
57
Manufacturer
Info
0–31 Block A [0–31]
U1
0
U1
0
U1
0
U1
0
H1
0x00
Max
Value
1200
60
1200
1200
60
1200
1200
1200
100
20,000
500
1200
1200
1000
1000
1000
60
0
0
32,767
65,535
x
255
255
255
255
0xff
Default
Value
550
2
500
600
2
550
0
450
50
4200
50
-50
550
100
25
100
40
–10
–500
900
1000
bq27500
or
bq27501
150
175
75
100
0x00
Units
0.1°C
s
0.1°C
0.1°C
s
0.1°C
0.1°C
0.1°C
0.1°C
mV
0.1°C
0.1°C
0.1°C
mA
mAh
mV
s
mA
mA
mAh
mAh
–
mAh
mAh
mAh
mAh
–
18
GENERAL DESCRIPTION
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