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BQ78412 Fiches technique(PDF) 22 Page - Texas Instruments

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No de pièce BQ78412
Description  Pb-Acid Battery State-of-Charge Indicator With Run-Time Display
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Fabricant  TI [Texas Instruments]
Site Internet  http://www.ti.com
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BQ78412 Fiches technique(HTML) 22 Page - Texas Instruments

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bq78412
SLUSAA0 – OCTOBER 2010
www.ti.com
Table 8. bq78412 Registers (Stored in Volatile Memory)(1)
DATA
ITEM
ADDRESS
BYTES
DESCRIPTION
UNITS
TYPE
BatteryStatusWord
0x0000
Battery status. See description inBatteryStatusWord
Temperature
0x0002
S
Battery temperature
°C
BatteryVoltage
0x0004
U
Battery voltage
mV
Battery current. Positive value = charge current, Negative
Current
0x0006
S
100 mA
value = discharge current.
Remaining battery capacity derated as function of discharge
RemCapDerated
0x0008
U
100 mAh
current.
FullChargeCapacity(FCC)
0x000A
U
Learned battery capacity at full charge, rated load.
100 mAh
2
Run time to empty derated as a function of discharge
RunTimetoEmpty
0x000C
U
minute
current. Only valid during discharge.
CycleCount
0x000E
U
Number of full discharge cycles or equivalents
Battery current averaged based on CurrentAvgTime
AverageCurrent
0x0010
S
100 mA
parameter
DeratedFCC
0x0012
U
Derated available capacity
100 mAh
Accumulated missed charge due to multiple discharges
AccumulatedMissedCharge
0x0014
U
%
occurring before a full charge has occurred
RelativeStateOfCharge
0x0016
U
Battery relative state of charge
%
(1)
Data words are returned in Little Endian format (least significant bit first).
Cumulative Usage Data
The bq78412 provides internal storage for cumulative usage data during normal operation. The stored data can
be retrieved over the communications interface for analysis by an external reader and used for warranty analysis
purposes. These data are stored in volatile memory. However, the stored data are backed up once a day to the
non-volatile memory and are written back to the volatile memory on a subsequent power-up. This retrieval only
happens if the device has been activated. Activation also provides a start point for usage logging.
Activation is done by setting DevConfig1[10] = 1
None of the counters roll-over, and are saturated to the maximum value in case of overflow.
Table 9 gives the memory locations of the stored data.
The following is the information that is stored.
Abuse Counters
These count the amount of time that the battery has spent outside recommended operating conditions.
Once every 6 minutes, the battery is checked for abuse. The appropriate counter increments if abuse is detected.
Each counter is of 2 bytes and can store values from 0 to 65535. This permits a maximum time of 273 days to be
recorded.
The abuse counters are:
OtCount : Time temperature was above OtThresh
UtCount : Time temperature was below UtThresh
OvCount : Time battery voltage was above OvThresh
UvCount : Time battery voltage was below UvThresh
OccCount : Time charging current was above OccThresh
OcdCount : Time discharging current was above OcdThresh
Figure 6 shows operating ranges and thresholds for voltage, temperature and current.
22
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