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bq27500
bq27501
System-Side Impedance Track™ Fuel Gauge
SLUS785 – SEPTEMBER 2007
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
.
Table 4-2. Control( ) Subcommands
CNTL
SEALED
CNTL FUNCTION
DESCRIPTION
DATA
ACCESS
CONTROL STATUS
0x0000
Yes
Reports the status of DF Checksum, Hibernate, IT, etc.
DEVICE TYPE
0x0001
Yes
Reports the device type (eg: "bq27500")
FW VERSION
0x0002
Yes
Reports the firmware version on the device type
HW VERSION
0x0003
Yes
Reports the hardware version of the device type
Reserved
0x0004
No
Not to be used
RESET DATA
0x0005
No
Returns reset data
Reserved
0x0006
No
Not to be used
PREV_MACWRITE
0x0007
No
Returns previous MAC command code
Reports the chemical identifier of the Impedance Track™
CHEMID
0x0008
Yes
configuration
BOARD OFFSET
0x0009
No
Forces the device Board Offset to be measured and stored
CC INT OFFSET
0x000b
No
Forces the device to measure and store the internal CC offset
SET HIBERNATE
0x0011
Yes
Forces DF:Pack Configuration [HIBERNATE] to 1
CLEAR HIBERNATE
0x0012
Yes
Forces DF:Pack Configuration [HIBERNATE] to 0
SEALED
0x0020
No
Places the bq27500/1 in SEALED access mode
IT ENABLE
0x0021
No
Enables the Impedance Track™ algorithm
IFCHECKSUM
0x0022
No
Reports the instruction flash checksum
CALMODE
0x0040
No
Places the bq27500/1 in calibration mode
RESET
0x0041
No
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( )
bit7
bit6
bit5
bit4
bit3
bit2
bit1
bit0
High Byte
–
FAS
SS
-
CCA
BCA
–
–
Low Byte
–
HIBERNATE
–
SLEEP
LDMD
RUP_DIS
VOK
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.
GENERAL DESCRIPTION
10
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