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RemainingCapacityAlarm() (0x01)
bq2084-V143
SLUS732 – SEPTEMBER 2006
Table 13. State and Status Bit Summary
CHG ZVCHG Power
State MAC Mode (MSB) CC() CV() DSG FET FUSE
FET
(1)
FET Mode
wakeup 0x00 Wake up 0 0 off
(2)
on on
(3)
ok normal
precharge 0x03 Precharge PC CV of
(2)
f on on
(4)
ok normal
chargesusp 0x04 Charge Suspension FC CV off on off ok normal
terminatecharge 0x07 Charge Terminate MC CV off on off ok normal
normalcharge 0x05 Charge FC
(5)
CV on on off ok normal
provisionalcharge 0 0 off on off ok normal
0x01 Normal
normaldischarge FC CV on on off ok normal
depleted PC CV off off off ok normal
depleted_ac PC CV off off off
(
(4)
)
ok normal
overheatdischarge FC CV off off off ok normal
0x0e System Present
overheatcharge FC CV off off off ok normal
battfail_overcharge 0 0 off on off ok normal
battfail_lowtemp 0 0 off on off ok normal
battfail_chargeterminate 0x08 Fault Charge Terminate 0 0 off on off ok normal
battfail_afe_chg 0 0 off of
(6)
f off ok normal
0x0c Battery Failure
battfail_afe_dsg FC CV off
(6)
off off ok normal
battfail_chg 0 0 off off
(6)
off ok normal
0x0a Over Current
battfail_dsg FC CV off
(6)
off off ok normal
removed 0x0f Battery Out FC CV off off off ok normal
sleep 0x0d Sleep 0 0 off off
(7)
off ok low
permanent_failure 0x09 Permanent Failure 0 0 off off off blow low
(1) CHG FET always on if discharge current greater than Discharge Detection Current (DF 0x115, 0x116)
(2) On if FET Config = 01 (Common precharge, charge FET)
(3) ZVCHG FET on, OD FET off if FET Config = 00 or 02 (ZVCHG FET or precharge FET)
(4) ZVCHG FET on, OD FET off if FET Config = 00 (ZVCHG FET), or ZVCHG FET off, OD FET on if FET Config = 02 (precharge FET)
(5) 0 if CVOV or PC is not CVOV and minimum cell voltage is less than the precharge cell voltage threshold
(6) If MiscConfig.Nonremoveable Battery is set, then FET is on.
Description: Sets or gets the low-capacity threshold value. Whenever the RemainingCapacity() falls below the
low-capacity value, the bq2084-V143 sends AlarmWarning() messages to the SMBus host with the
REMAINING_CAPACITY_ALARM bit set. A low-capacity value of 0 disables this alarm. The bq2084-V143
initially sets the low-capacity value to Remaining Capacity Alarm value programmed in DF 0x02-0x03. The
low-capacity value remains unchanged until altered by the RemainingCapacityAlarm() function. The low-capacity
value may be expressed in either current (mA) or power (10 mWh) depending on the setting of the
BatteryMode() CAPACITY_MODE bit.
Purpose: The RemainingCapacityAlarm() function can be used by systems that know how much power they
require to save their operating state. It enables those systems to more finely control the point at which they
transition into suspend or hibernate state. The low-capacity value can be read to verify the value in use by the
bq2084-V143 low-capacity alarm.
SMBus protocol: Read or write word
Input/Output: Unsigned integer-value below which Low Capacity messages are sent.
BATTERY MODES
CAPACITY_MODE CAPACITY_MODE
BIT = 0 BIT = 1
Units mAh at C/5 10 mWh at P/5
Range 0-65,535 mAh 0-65,535 10 mWh
Granularity Not applicable
Accuracy See RemainingCapacity()
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