BQ2084-V140_14 Datasheet, PDF (34/64 Pages) Texas Instruments – SBS v1.1-COMPLIANT GAS GAUGE FOR USE WITH THE bq29312

bq2084-V140
SLUS664B – JULY 2005 – REVISED AUGUST 2006
www.ti.com
PRIMARY_BATTERY bit is not used by the bq2084-V140. The bq2084-V140 forces this bit to zero.
Battery Mode() BITS
INTERNAL_CHARGE_CONTROLLER
PRIMARY_BATTERY_SUPPORT
Reserved
RELEARN_FLAG
CHARGE_CONTROLLER_ENABLED
PRIMARY_BATTERY
Reserved
ALARM_MODE
CHARGER_MODE
CAPACITY_MODE
Table 14. Battery Mode Bits and Values
BITS USED
0
1
2-6
7
8
9
10-12
13
FORMAT
Read only bit flag
Read only bit flag
Read only bit flag
R/W bit flag
R/W bit flag
R/W bit flag
14
R/W bit flag
15
R/W bit flag
ALLOWABLE VALUES
1 - always one
0 - always zero
0 - always zero
0—Battery OK1—Relearn cycle requested
Not used
Not used
0 - always zero
0—Enable alarm broadcast (default)1—Disable
alarm broadcast
0—Enable charging broadcast
(default)1—Disable charging broadcast
0—Report in mA or mAh (default)1—Report in
10 mW or 10 mWh
ALARM_MODE bit is set to disable the bq2084-V140s ability to master the SMBus and send AlarmWarning()
messages to the SMBus host and the smart battery charger. When set, the bq2084-V140 does not master the
SMBus, and AlarmWarning() messages are not sent to the SMBus host and the smart battery charger for a
period of no more than 60s and no less than 59s. When cleared (default), the smart battery sends the
AlarmWarning() messages to the SMBus host and the smart battery charger any time an alarm condition is
detected.
• The ALARM broadcast does not occur more often than once every 10 s. Whenever the BATTERY_MODE
command is received, the bq2084-V140 resets the bit and starts or restarts a 60-s (nominal) timer. After the
timer expires, the bq2084-V140 automatically enables alarm broadcasts to ensure that the accidental
deactivation of broadcasts does not persist. An SMBus host that does not want the bq2084-V140 to be a
master on the SMBus must therefore continually set this bit at least once per 59 s to keep the bq2084-V140
from broadcasting alarms.
• The ALARM_MODE bit defaults to a cleared state when the bq2084-V140 enters SLEEP mode.
• The condition of the ALARM-MODE bit does not affect the operation or state of the CHARGER_MODE bit,
which is used to prevent broadcasts of ChargingCurrent() and ChargingVoltage() to the smart battery
charger. CHARGER_MODE bit enables or disables the bq2084-V140's transmission of ChargingCurrent()
and ChargingVoltage() messages to the smart battery charger. When set, the bq2084-V140 does not
transmit ChargingCurrent() and ChargingVoltage() values to the smart battery charger. When cleared, the
bq2084-V140 transmits the ChargingCurrent() and ChargingVoltage() values to the smart battery charger.
The CHARGER_MODE bit defaults to a cleared state when the bq2084-V140 enters SLEEP mode.
CAPACITY_MODE bit indicates if capacity information is reported in mA/mAh or 10 mW/10 mWh. When set, the
bq2084-V140 reports capacity information in 10 mW/10 mWh as appropriate. When cleared, the bq2084-V140
reports capacity information in mA/mAh as appropriate. The CAPACITY_MODE bit defaults to a cleared state
when the bq2084-V140 enters SLEEP mode.
The following functions are changed to accept or return values in mA/mAh or 10 mW/10 mWh depending on the
CAPACITY_MODE bit:
• RemainingCapacityAlarm()
• AtRate()
• RemainingCapacity()
• FullChargeCapacity()
• DesignCapacity()
The following functions are calculated on the basis of capacity and may be calculated differently depending on
the CAPACITY_MODE bit:
• AtRateOK()
• AtRateTimeToEmpty()
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