BQ2085-V1P2 Datasheet, PDF (12/56 Pages) Texas Instruments – SBS-COMPLIANT GAS GAUGE IC FOR USE WITH THE bq29311

bq2085−V1P2
SLUS590 − DECEMBER 2003
Table 3. bq2085−V1P2 Register Functions (Continued)
FUNCTION
FullChargeCapacity
RunTimeToEmpty
AverageTimeToEmpty
AverageTimeToFull
ChargingCurrent
ChargingVoltage
Battery Status
CycleCount
DesignCapacity
DesignVoltage
SpecificationInfo
ManufactureDate
SerialNumber
Reserved
ManufacturerName
DeviceName
DeviceChemistry
ManufacturerData
Pack status
Pack configuration
VCELL4
VCELL3
VCELL2
VCELL1
COMMAND CODE
0x10
0x11
0x12
0x13
0x14
0x15
0x16
0x17
0x18
0x19
0x1a
0x1b
0x1c
0x1d-0x1f
0x20
0x21
0x22
0x23
0x2f (LSB)
0x2f (MSB)
0x3c
0x3d
0x3e
0x3f
ACCESS
read
read
read
read
read
read
read
read
read
read
read
read
read
0
read
read
read
read
read
read
read
read
read
read
UNITS
mAh, 10 mWh
minutes
minutes
minutes
mA
mV
NA
cycles
mAh, 10 mWh
mV
NA
NA
integer
0
string
string
string
string
NA
NA
mV
mV
mV
mV
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Self-Discharge
The bq2085−V1P2 estimates the self-discharge of the battery to maintain an accurate measure of the battery
capacity during periods of inactivity. The bq2085−V1P2 makes self-discharge adjustments to RM( ) every 1/4
seconds when awake and periodically when in sleep mode. The period is determined by Sleep Timer DF 0xe7.
The self-discharge estimation rate for 25°C is doubled for each 10 degrees above 25°C or halved for each 10
degrees below 25°C. The following table shows the relation of the self-discharge estimation at a given
temperature to the rate programmed for 25°C (Y% per day programmed in DF 0x2c).
Table 4. Self-Discharge for Rate Programmed
TEMPERATURE
(°C)
Temp < 10
10 ≤ Temp <20
20 ≤ Temp <30
30 ≤ Temp <40
40 ≤ Temp <50
50 ≤ Temp <60
60 ≤ Temp <70
70≤ Temp
SELF-DISCHARGE RATE
1/4 Y% per day
1/2 Y% per day
Y% per day
2Y% per day
4Y% per day
8Y% per day
16Y% per day
32Y% per day
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