BQ27541-V200_17 Datasheet, PDF (20/46 Pages) Texas Instruments – Single Cell Li-Ion Battery Fuel Gauge for Battery Pack Integration

bq27541-V200
Not Recommended for New Designs
SLUSA11B – FEBRUARY 2010 – REVISED SEPTEMBER 2013
www.ti.com
When in SEALED mode the [SS] bit of CONTROL_STATUS is set, but when the UNSEAL keys are correctly
received by the bq27541, the [SS] bit is cleared. When the full-access keys are correctly received the
CONTROL_STATUS [FAS] bit is cleared.
Both Unseal Key and Full-Access Key have two words and are stored in data flash. The first word is Key 0 and
the second word is Key 1. The order of the keys sent to bq27541 are Key 1 followed by Key 0. The order of the
bytes for each key entered through the Control( ) command is the reverse of what is read from the part. For an
example, if the Unseal Key is 0x56781234, key 1 is 0x1234 and key 0 is 0x5678. Then Control( ) should supply
0x3412 and 0x7856 to unseal the part. The Unseal Key and the Full-Access Key can only be updated when in
FULL-ACCESS mode.
DATA FLASH SUMMARY
Table 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
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
32
32
32
34
34
34
34
36
36
36
36
36
36
36
36
36
48
48
48
48
48
48
48
48
48
49
49
49
49
56
56
56
Subclass
Safety
Safety
Safety
Safety
Safety
Safety
Charge Inhibit Cfg
Charge Inhibit Cfg
Charge Inhibit Cfg
Charge
Charge
Charge
Charge
Charge Termination
Charge Termination
Charge Termination
Charge Termination
Charge Termination
Charge Termination
Charge Termination
Charge Termination
Charge Termination
Data
Data
Data
Data
Data
Data
Data
Data
Data
Discharge
Discharge
Discharge
Discharge
Manufacturer Data
Manufacturer Data
Manufacturer Data
Table 7. Data Flash Summary
Offset
0
2
3
5
7
8
0
2
4
2
4
6
8
2
4
6
8
9
10
11
12
13
0
8
9
17
19
23
25
27
29
0
1
2
3
0
2
4
Name
OT Chg
OT Chg Time
OT Chg Recovery
OT Dsg
OT Dsg Time
OT Dsg Recovery
Chg Inhibit Temp Low
Chg Inhibit Temp High
Temp Hys
Charging Voltage
Delta Temp
Suspend Low Temp
Suspend High Temp
Taper Current
Min Taper Capacity
Taper Voltage
Current Taper Window
TCA Set %
TCA Clear %
FC Set %
FC Clear %
DODatEOC Delta T
Rem Cap Alarm
Initial Standby
Initial MaxLoad
Cycle Count
CC Threshold
Design Capacity
Design Energy
State of Health Load
Device Name
SOC1 Set Threshold
SOC1 Clear Threshold
SOCF Set Threshold
SOCF Clear Threshold
Pack Lot Code
PCB Lot Code
Firmware Version
Data
Type
I2
U1
I2
I2
U1
I2
I2
I2
I2
I2
I2
I2
I2
I2
I2
I2
U1
I1
I1
I1
I1
I2
I2
I1
I2
U2
I2
I2
I2
I2
S8
U1
U1
U1
U1
H2
H2
H2
Min Value Max Value Default Value
0
0
0
0
0
0
–400
–400
0
0
0
–400
–400
0
0
0
0
–1
–1
–1
–1
0
0
–256
–32767
0
100
0
0
0
x
0
0
0
0
0
0
0
1200
60
1200
1200
60
1200
1200
1200
100
4600
500
1200
1200
1000
1000
1000
60
100
100
100
100
1000
700
0
0
65535
32767
32767
32767
–400
x
255
255
255
255
FFFF
FFFF
FFFF
550
2
500
600
2
550
0
450
50
4200
50
-50
550
100
25
100
40
99
95
100
98
100
100
–10
–500
0
900
1000
5400
–400
bq27541
150
175
75
100
0
0
0
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
0.01 mAh
mV
s
%
%
%
%
0.1°C
mAh
mA
mA
Count
mAh
mAh
mWh
mA
–
mAh
mAh
mAh
mAh
–
–
–
20
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