 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
BQ20Z80-V101 Datasheet(PDF) 10 Page - Texas Instruments |
|
||||||||||||||||||||||||||||||
BQ20Z80-V101 Datasheet(HTML) 10 Page - Texas Instruments |
|
|
10 / 75 page  www.ti.com 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 µV. 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 |
Similar Part No. - BQ20Z80-V101_07 |
|
Similar Description - BQ20Z80-V101_07 |
|
|
Link URL |
| Privacy Policy |
| ALLDATASHEET.NET |
| Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
| Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
|
Family Site : ic2ic.com |
icmetro.com |
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
