BQ27500 Datasheet, PDF (10/39 Pages) Texas Instruments – System-Side Impedance Track™ Fuel Gauge

bq27500
bq27501
System-Side Impedance Track™ Fuel Gauge
SLUS785 – SEPTEMBER 2007
www.ti.com
4.1.1.1 Control( ): 0x00/0x01
Issuing a Control( ) command requires a subsequent two-byte sub-command. These additional bytes
specify the particular control function desired. The Control( ) command allows the system to control
specific features of the bq27500 during normal operation and additional features when the bq27500/1 is in
different access modes, as described in Table 4-2.
CNTL FUNCTION
CONTROL STATUS
DEVICE TYPE
FW VERSION
HW VERSION
Reserved
RESET DATA
Reserved
PREV_MACWRITE
CHEMID
BOARD OFFSET
CC INT OFFSET
SET HIBERNATE
CLEAR HIBERNATE
SEALED
IT ENABLE
IFCHECKSUM
CALMODE
RESET
Table 4-2. Control( ) Subcommands
CNTL
DATA
0x0000
0x0001
0x0002
0x0003
0x0004
0x0005
0x0006
0x0007
0x0008
0x0009
0x000b
0x0011
0x0012
0x0020
0x0021
0x0022
0x0040
0x0041
SEALED
ACCESS
Yes
Yes
Yes
Yes
No
No
No
No
Yes
No
No
Yes
Yes
No
No
No
No
No
DESCRIPTION
Reports the status of DF Checksum, Hibernate, IT, etc.
Reports the device type (eg: "bq27500")
Reports the firmware version on the device type
Reports the hardware version of the device type
Not to be used
Returns reset data
Not to be used
Returns previous MAC command code
Reports the chemical identifier of the Impedance Track™
configuration
Forces the device Board Offset to be measured and stored
Forces the device to measure and store the internal CC offset
Forces DF:Pack Configuration [HIBERNATE] to 1
Forces DF:Pack Configuration [HIBERNATE] to 0
Places the bq27500/1 in SEALED access mode
Enables the Impedance Track™ algorithm
Reports the instruction flash checksum
Places the bq27500/1 in calibration mode
Forces a full reset of the bq27500/1
4.1.1.1.1 CONTROL STATUS: 0X0000
Instructs the gas gauge to return status information to Control addresses 0x00/0x01. The status word
includes the following information.
Table 4-3. CONTROL STATUS Bit Definitions
Flags( )
High Byte
Low Byte
bit7
bit6
bit5
–
FAS
SS
–
HIBERNATE
–
bit4
-
SLEEP
bit3
CCA
LDMD
bit2
BCA
RUP_DIS
bit1
–
VOK
bit0
–
QEN
FAS = Status bit indicating the bq27500/1 is in FULL ACCESS SEALED state. Active when set.
SS = Status bit indicating the bq27500/1 is in SEALED State. Active when set.
CCA = Status bit indicating the bq27500/1 is Coulomb Counter Calibration routine is active. Active when set.
BCA = Status bit indicating the bq27500/1 Board Calibration routine is active. Active when set.
HIBERNATE = Status bit indicating a request for entry into HIBERNATE from SLEEP mode. True when set. Default is 0.
SLEEP = Status bit indicating the bq27500/1 is in SLEEP mode. True when set. Default is 0.
LDMD = Status bit indicating the bq27500/1 Impedance Track™ algorithm is using constant-power mode. True when set. Default is 0
(constant-current mode)
RUP_DIS = Status bit indicating the bq27500/1 Ra table updates are disabled. Updates disabled when set.
VOK = Status bit indicating the bq27500/1 voltages are OK for QMAX. True when set.
QEN = Status bit indicating the bq27500/1 QMAX updates enabled. True when set.
4.1.1.1.2 DEVICE TYPE: 0x0001
Instructs the fuel gauge to return the device type to addresses 0x00/0x01.
10
GENERAL DESCRIPTION
Submit Documentation Feedback