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BatteryStatus() (0x16)

ALARM BITS

bq2084-V143

SLUS732 – SEPTEMBER 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.

Description: Returns the bq2084-V143 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-V143. 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 OVER_CHARGED_ALARM

0x4000 TERMINATE_CHARGE_ALARM

0x2000 Reserved

0x1000 OVER_TEMP_ALARM

0x0800 TERMINATE_DISCHARGE_ALARM

0x0400 Reserved

0x0200 REMAINING_CAPACITY_ALARM

0x0100 REMAINING_TIME_ALARM

STATUS BITS

0x0080 Initialized

0x0040 DISCHARGING

0x0020 FULLY_CHARGED

0x0010 FULLY_DISCHARGED

ERROR CODES

0x0007 Unknown Error

0x0006 BadSize

0x0005 Overflow/Underflow

0x0004 AccessDenied

0x0003 UnsupportedCommand

0x0002 ReservedCommand

0x0001 Busy

0x0000 OK

OVER_CHARGED_ALARM bit is set whenever the bq2084-V143 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-V143 detects that the battery is no longer being charged and there are 2 mAh of

continuous discharge (i.e., the bq2084-V143 detects discharge activity or no activity above the digital filter).

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