BQ2060SS Datasheet, PDF (22/59 Pages) Texas Instruments – SBS V1.1-COMPLIANT GAS GAUGE IC

bq2060
SLUS035E – JANUARY 2000 – REVISED OCTOBER 2005
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RemainingTimeAlarm() (0x02); [0x02]
DESCRIPTION
Sets or gets the remaining time alarm value. Whenever the AverageTimeToEmpty() falls below the
remaining time value, the bq2060 sends AlarmWarning() messages to the SMBus Host with the
REMAINING_TIME_ALARM bit set. A remaining time value of 0 effectively disables this alarm. The
bq2060 initially sets the remaining time value to the Remaining Time Alarm value programmed in
EE 0x02 - 0x03. The remaining time value remains unchanged until altered by the
RemainingTimeAlarm() function.
PURPOSE
The RemainingTimeAlarm() function can be used by systems that want to adjust when the
remaining time alarm warning is sent. The remaining time value can be read to verify the value in
use by the bq2060’ RemainingTimeAlarm().
SMBus PROTOCOL Read or Write Word
INPUT/OUTPUT:
Unsigned integer—the point below which remaining time messages are sent.
Units: minutes
Range: 0 to 65,535 minutes
Granularity: Not applicable
Accuracy: see AverageTimeToEmpty()
BatteryMode() (0x03); [0x03]
DESCRIPTION This function selects the various battery operational modes and reports the battery’s mode and
requests.
Defined modes include
• Whether the battery’s capacity information is specified in mAh or 10 mWh (CAPACITY_MODE bit)
• Whether the ChargingCurrent() and ChargingVoltage() values are broadcast to the Smart Battery Charger
when the bq2060 detects that the battery requires charging (CHARGER_MODE bit)
• Whether all broadcasts to the Smart Battery Charger and Host are disabled
The defined request condition is the battery requesting conditioning cycle (RELEARN_FLAG).
PURPOSE
The CAPACITY_MODE bit allows power management systems to best match their electrical
characteristics with those reported by the battery. For example, a switching power supply
represents a constant power load, whereas a linear supply is better represented by a constant
current model. The CHARGER_MODE bit allows a SMBus Host or Smart Battery Charger to
override the Smart Battery’s desired charging parameters disabling the bq2060’s broadcasts. The
RELEARN_ FLAG bit allows the bq2060 to request a conditioning cycle.
SMBus PROTOCOL Read orWriteWord
INPUT/OUTPUT
Unsigned integer —bit mapped— see below.
Units: not applicable
Range: 0–1
Granularity: not applicable
Accuracy: not applicable
The BatteryMode() word is divided into two halves, the most significant bit (bits 8–15) which is read/write and the
least significant bit (bits 0–7) which is read only. The bq2060 forces bits 0–6 to zero and prohibits writes to bit 7.
Table 9 summarizes the meanings of the individual bits in the BatteryMode() word and specifies the default
values, where applicable, are noted.
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