BQ27531-G1 Datasheet, PDF (12/21 Pages) Texas Instruments – Battery Management Unit Impedance Track Fuel Gauge for Use With the bq2419x Charger Controller

bq27531-G1
SLUSBE7 – MARCH 2013
www.ti.com
CHARGER DATA COMMANDS
The charger registers are mapped to a series of single byte Charger Data Commands to enable system reading
and writing of battery charger registers. During charger power up, the registers are initialized to Charger Reset
State. The fuel gauge can change the values of these registers during the System Reset State.
Each of the bits in the Charger Data Commands can be read/write. It is important to note that System Access
can be different from the read/write access as defined in bq2419x charger hardware. The fuel gauge may block
write access to the charger hardware when the bit function is controlled by the fuel gauge exclusively. For
example, the [VREGx] bits of Chrgr_Voltage_Reg4 are controlled by the fuel gauge and cannot be modifed by
system.
The bq27531 reads the corresponding registers of System_Stat_Reg8( ) and Fault_Reg9( ) every second to
mirror the charger status. Other registers in the bq2419x are read when registers are modified by the bq27531.
NAME
ChargerStatus( )
Chrgr_InCtrl_Reg0( )
Chrgr_POR_Config_Reg1( )
Chrgr_Current_Reg2( )
Chrgr_PreTerm_Reg3( )
Chrgr_Voltage_Reg4( )
Chrgr_TermTimer_Reg5( )
Chrgr_IRThermal_Reg6( )
Chrgr_OpCtrl_Reg7( )
Chrgr_Status_Reg8( )
Chrgr_Fault_Reg9( )
Chrgr_Rev_RegA( )
Table 4. Charger Data Commands
COMMAND CODE
CHGRSTAT
CHGR0
CHGR1
CHGR2
CHGR3
CHGR4
CHGR5
CHGR6
CHGR7
CHGR8
CHGR9
CHGRA
0x74
0x75
0x76
0x77
0x78
0x79
0x7a
0x7b
0x7c
0x7d
0x7e
0x7f
bq2419x
Charger
Memory
Location
NA
0x00
0x01
0x02
0x03
0x04
0x05
0x06
0x07
0x08
0x09
0x0a
SEALED
ACCESS
R
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
UNSEALED
ACCESS
Refresh Rate
R
Every second
R/W
Data Change
R/W
Data Change
R/W
Data Change
R/W
Data Change
R/W
Data Change
R/W
Data Change
R/W
Data Change
R/W
Data Change
R/W
Every Second
R/W
Every Second
R/W
Data Change
12
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