BQ27500_08 Datasheet, PDF (10/39 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
4.1.1.1 Control( ): 0x00/0x01
Issuing a Control( ) command requires a subsequent 2-byte subcommand. These additional bytes specify
the particular control function desired. The Control( ) command allows the system to control specific
features of the bq27500/1 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
DF_CHECKSUM
RESET_DATA
Reserved
PREV_MACWRITE
CHEM_ID
BOARD_OFFSET
CC_INT_OFFSET
WRITE_OFFSET
SET_HIBERNATE
CLEAR_HIBERNATE
SEALED
IT_ENABLE
IF_CHECKSUM
CAL_MODE
RESET
Table 4-2. Control( ) Subcommands
CNTL
DATA
0x0000
0x0001
0x0002
0x0003
0x0004
0x0005
0x0006
0x0007
0x0008
0x0009
0x000a
0x000b
0x0011
0x0012
0x0020
0x0021
0x0022
0x0040
0x0041
SEALED
ACCESS
Yes
Yes
Yes
Yes
No
Yes
No
Yes
Yes
No
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
Enables a data flash checksum to be generated and
reports on a read
Returns reset data
Not to be used
Returns previous MAC command code
Reports the chemical identifier of the Impedance Track™
configuration
Forces the device to measure and store the board offset
Forces the device to measure the internal CC offset
Forces the device to store the internal CC offset
Forces CONTROL_STATUS [HIBERNATE] to 1
Forces CONTROL_STATUS [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 fuel 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
CSV
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.
CSV = Status bit indicating a valid data flash checksum has been generated. Active when set.
CCA = Status bit indicating the bq27500/1 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.
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 okay for Qmax. True when set.
QEN = Status bit indicating the bq27500/1 Qmax updates enabled. True when set.
10
GENERAL DESCRIPTION
Submit Documentation Feedback