Datasheet
bq27541-V200
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.
Table 7. Data Flash Summary
Class Subclass Subclass Offset Name Data Min Value Max Value Default Value Units
ID Type
Configuration 2 Safety 0 OT Chg I2 0 1200 550 0.1°C
Configuration 2 Safety 2 OT Chg Time U1 0 60 2 s
Configuration 2 Safety 3 OT Chg Recovery I2 0 1200 500 0.1°C
Configuration 2 Safety 5 OT Dsg I2 0 1200 600 0.1°C
Configuration 2 Safety 7 OT Dsg Time U1 0 60 2 s
Configuration 2 Safety 8 OT Dsg Recovery I2 0 1200 550 0.1°C
Configuration 32 Charge Inhibit Cfg 0 Chg Inhibit Temp Low I2 –400 1200 0 0.1°C
Configuration 32 Charge Inhibit Cfg 2 Chg Inhibit Temp High I2 –400 1200 450 0.1°C
Configuration 32 Charge Inhibit Cfg 4 Temp Hys I2 0 100 50 0.1°C
Configuration 34 Charge 2 Charging Voltage I2 0 4600 4200 mV
Configuration 34 Charge 4 Delta Temp I2 0 500 50 0.1°C
Configuration 34 Charge 6 Suspend Low Temp I2 –400 1200 -50 0.1°C
Configuration 34 Charge 8 Suspend High Temp I2 –400 1200 550 0.1°C
Configuration 36 Charge Termination 2 Taper Current I2 0 1000 100 mA
Configuration 36 Charge Termination 4 Min Taper Capacity I2 0 1000 25 0.01 mAh
Configuration 36 Charge Termination 6 Taper Voltage I2 0 1000 100 mV
Configuration 36 Charge Termination 8 Current Taper Window U1 0 60 40 s
Configuration 36 Charge Termination 9 TCA Set % I1 –1 100 99 %
Configuration 36 Charge Termination 10 TCA Clear % I1 –1 100 95 %
Configuration 36 Charge Termination 11 FC Set % I1 –1 100 100 %
Configuration 36 Charge Termination 12 FC Clear % I1 –1 100 98 %
Configuration 36 Charge Termination 13 DODatEOC Delta T I2 0 1000 100 0.1°C
Configuration 48 Data 0 Rem Cap Alarm I2 0 700 100 mAh
Configuration 48 Data 8 Initial Standby I1 –256 0 –10 mA
Configuration 48 Data 9 Initial MaxLoad I2 –32767 0 –500 mA
Configuration 48 Data 17 Cycle Count U2 0 65535 0 Count
Configuration 48 Data 19 CC Threshold I2 100 32767 900 mAh
Configuration 48 Data 23 Design Capacity I2 0 32767 1000 mAh
Configuration 48 Data 25 Design Energy I2 0 32767 5400 mWh
Configuration 48 Data 27 State of Health Load I2 0 –400 –400 mA
Configuration 48 Data 29 Device Name S8 x x bq27541 –
Configuration 49 Discharge 0 SOC1 Set Threshold U1 0 255 150 mAh
Configuration 49 Discharge 1 SOC1 Clear Threshold U1 0 255 175 mAh
Configuration 49 Discharge 2 SOCF Set Threshold U1 0 255 75 mAh
Configuration 49 Discharge 3 SOCF Clear Threshold U1 0 255 100 mAh
Configuration 56 Manufacturer Data 0 Pack Lot Code H2 0 FFFF 0 –
Configuration 56 Manufacturer Data 2 PCB Lot Code H2 0 FFFF 0 –
Configuration 56 Manufacturer Data 4 Firmware Version H2 0 FFFF 0 –
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