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| 型號： | BQ20Z80DBT-V101 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDSO38 |
| 封裝： | GREEN, PLASTIC, TSSOP-38 |
| 文件頁數(shù)： | 2/73頁 |
| 文件大?。?/td> | 1094K |
| 代理商： | BQ20Z80DBT-V101 |
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Pulsed Load Compensation
Reserve Battery Capacity
QMAX Update Conditions
bq20z80-V101
SLUS625D – SEPTEMBER 2004 – REVISED OCTOBER 2005
bq20z80 can be configured to use several methods of this prediction shown in Table 1, by setting the DF.Load
Select value. Because this estimate has only a second-order effect on remaining capacity accuracy, different
measurement based methods (0x00 to 0x03) result in only minor differences in accuracy. However, methods
0x04-0x06 where an estimate is arbitrarily assigned by the user can result in significant error if a fixed estimate is
far from the actual load.
Table 1. Impedance Track Load-Compensation Settings
DF:Load Select
Load Mode
Load Compensation
0x00
Constant Current
Previous Discharge Average Current in DF:Avg I Last Run
Constant Power
Previous Discharge Average Power in DF:Avg P Last Run
0x01
Constant Current
Present Discharge Average Current
Constant Power
Present Discharge Average Power
0x02
Constant Current
SBS.Current( )
Constant Power
RAM.InstantPower( ) = SBS.Current( ) x SBS.Voltage( )
0x03
Constant Current
SBS.AverageCurrent( )
Constant Power
SBS.AveragePower( ) = SBS.AverageCurrent( ) x SBS.Voltage( )
0x04
Constant Current
SBS.DesignCapacity( ) / 5
Constant Power
SBS.DesignEnergy( ) / 5
0x05
Constant Current
SBS.AtRate( ) (mAh)
Constant Power
SBS.AtRate( ) (10mWh)
0x06
Constant Current
DF:User Rate-mA
Constant Power
DF:User Rate-10mWh
NAME
CLASS / SUBCLASS
FORMAT
VALID RANGE
SIZE (BYTES)
UNITS
DEFAULT VALUE
User Rate-mAh
Gas Gauging / IT Config (80)
2000 to 9000
2
mAh
0
Signed Int
User Rate-10 mWh
Gas Gauging / IT Config (80)
3000 to 14000
2
10 mWh
0
In order to take into account pulsed loads, while calculating remaining capacity until DF:Term Voltage is reached,
bq20z80 monitors not only average load but also short load spikes. The maximum voltage deviation during a
load spike is continuously updated during discharge and stored in DF:Delta Voltage.
NAME
CLASS / SUBCLASS
FORMAT
VALID RANGE
SIZE (BYTES)
UNITS
DEFAULT VALUE
Delta Voltage
Gas Gauging / State (82)
Integer
-32767 to 32768
2
mV
0
The bq20z80 allows an amount of capacity to be reserved in either mAh (DF:Reserve Cap-mAh) or 10 mWh
(DF:Reserve Cap-10mWh) units between the point where SBS.RemainingCapacity( ) is reported as 0%, and the
absolute minimum voltage, DF:Term Voltage. This enables a system to report zero energy, but still have enough
reserve energy to perform a controlled shutdown, or to provide an extended sleep period for the host system.
Also, if DF:Operation Cfg B [ResCap] = 0, the reserve capacity is compensated at a no-load conditions.
However, if DF:Operation Cfg B [ResCap] = 1, then the reserve capacity is compensated at the present
discharge rate as selected by DF:Load Select.
NAME
CLASS / SUBCLASS
FORMAT
VALID RANGE
SIZE (BYTES)
UNITS
DEFAULT VALUE
Reserve Cap-mAh
0 to 9000
2
mAh
0
Gas Gauging /
Signed Int
IT Config (80)
Reserve Cap-10 mWh
0 to 14000
2
10 mWh
0
The bq20z80 updates the no-load full capacity (QMAX) when two open circuit voltage (OCV) readings are taken
when the battery is in a relaxed state before and after charge or discharge activity. A relaxed state is achieved if
the battery voltage has a dV/dt of < 4
V. Typically it takes 2 hrs in a charged state and 5 hrs in a discharged
state to ensure that the dV/dt condition is satisfied. If 5 hrs is exceeded, a reading will be taken even if the dV/dt
condition was not satisfied. This update is disqualified under the following conditions:
10
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