BQ2084-V140_14 Datasheet, PDF (41/64 Pages) Texas Instruments – SBS v1.1-COMPLIANT GAS GAUGE FOR USE WITH THE bq29312

bq2084-V140
www.ti.com
SLUS664B – JULY 2005 – REVISED AUGUST 2006
Units: mV
Range: 0 to 65,535 mV
Granularity: 1 mV
Accuracy: Not applicable
Invalid Data Indication: 65,535 indicates the charger should operate as a current source outside its maximum
regulated voltage range.
BatteryStatus() (0x16)
Description: Returns the bq2084-V140 status word (flags). Some of the BatteryStatus() flags ( and
REMAINING_TIME_ALARM) are calculated on the basis of either current or power depending on the setting of
the BatteryMode()CAPACITY_MODE bit. This is important because use of the wrong calculation mode may
result in an inaccurate alarm.
Purpose: The BatteryStatus() function is used by the power management system to get alarm and status bits,
as well as error codes from the bq2084-V140. This is basically the same information broadcast to both the
SMBus host and the smart battery charger by the AlarmWarning() function except that the AlarmWarning()
function sets the error code bits all high before sending the data.
SMBus protocol: Read word
Output: Unsigned Integer-status register with alarm conditions bit-mapped as follows:
ALARM BITS
0x8000
0x4000
0x2000
0x1000
0x0800
0x0400
0x0200
0x0100
STATUS BITS
0x0080
0x0040
0x0020
0x0010
ERROR CODES
0x0007
0x0006
0x0005
0x0004
0x0003
0x0002
0x0001
0x0000
OVER_CHARGED_ALARM
TERMINATE_CHARGE_ALARM
Reserved
OVER_TEMP_ALARM
TERMINATE_DISCHARGE_ALARM
Reserved
REMAINING_CAPACITY_ALARM
REMAINING_TIME_ALARM
Initialized
DISCHARGING
FULLY_CHARGED
FULLY_DISCHARGED
Unknown Error
BadSize
Overflow/Underflow
AccessDenied
UnsupportedCommand
ReservedCommand
Busy
OK
ALARM BITS
OVER_CHARGED_ALARM bit is set whenever the bq2084-V140 detects that the battery is being charged
beyond the maximum overcharge limit, which is full capacity plus Maximum Overcharge DF 0x51-0x52. This bit
is cleared when the bq2084-V140 detects that the battery is no longer being charged and there are 2 mAh of
continuous discharge (i.e., the bq2084-V140 detects discharge activity or no activity above the digital filter).
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