 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
BQ20Z80DBTR-V101G4 Datasheet(PDF) 8 Page - Texas Instruments |
|
||||||||||||||||||||||||||||||
BQ20Z80DBTR-V101G4 Datasheet(HTML) 8 Page - Texas Instruments |
|
|
8 / 73 page  www.ti.com Charge and Discharge Counting Coulomb Counter Dead Band Voltage Current Auto Calibration Temperature bq20z80-V101 SLUS625D – SEPTEMBER 2004 – REVISED OCTOBER 2005 The integrating delta-sigma ADC measures the charge/discharge flow of the battery by measuring the voltage drop across a small-value sense resistor between the SR1 and SR2 pins. The integrating ADC measures bipolar signals from -0.25 V to 0.25 V. The bq20z80 detects charge activity when VSR = V(SR1)-V(SR2) is positive and discharge activity when VSR = V(SR1)-V(SR2) is negative. The bq20z80 continuously integrates the signal over time, using an internal counter. The fundamental rate of the counter is 0.65 nVh. The bq20z80 does not accumulate charge or discharge for gas gauging when the current input is below the dead-band current threshold. The threshold is programmed in DF:CC Deadband (Coulomb Counter Deadband) and should be set sufficiently high to prevent false signal detection with no charge or discharge flowing through the sense resistor. NAME CLASS / SUBCLASS FORMAT VALID RANGE SIZE (BYTES) UNITS DEFAULT VALUE CC Deadband Calibration / Current (107) Integer 0 to 255 1 294nV 34 The bq20z80 updates the individual series cell voltages through the bq29312A at one-second intervals. In Sleep mode the period changes from 1 s to DF:Sleep Voltage Time. The bq20z80 configures the bq29312A to connect the selected cell, cell offset, or bq29312A VREF to the CELL pin of the bq29312, which is required to be connected to VIN of the bq20z80. The internal ADC of the bq20z80 measures the voltage, scales and calibrates it appropriately, then reports the SBS.Voltage( ) and the individual cell voltages in SBS.CellVoltage1( ), SBS.CellVoltage2( ), SBS.CellVoltage3( ), and SBS.CellVoltage4( ). This data is also used to calculate the impedance of the cell for the Impedance Track gas-gauging when SBS.Current( ) is above 100 mA and dV/dt is < 1 µV/s. The bq20z80 uses the SR1 and SR2 inputs to measure and calculate the battery charge and discharge current. This value is reported via SBS.Current( ) and is updated at one-second intervals in normal mode, and at intervals defined by DF:Sleep Current Time in sleep mode. SBS.AverageCurrent( ) is implemented as a single-pole infinite-impulse response (IIR) filter with a 14.5 s time constant using SBS.Current( ) data and is also updated once per second. NAME CLASS / SUBCLASS FORMAT VALID RANGE SIZE (BYTES) UNITS DEFAULT VALUE Sleep Current Time Power / Power (68) Integer 0 to 255 1 s 20 The bq20z80 provides an auto-calibration feature to cancel the voltage offset error across SR1 and SR2 for maximum charge measurement accuracy. The bq20z80 performs auto-calibration when the SMBus lines stay low continuously for a minimum of 5 s and SBS.Temperature( ) is within bounds of DF:Cal Inhibit Temp Low and DF:Cal Inhibit Temp High. The bq20z80 is capable of automatic offset calibration down to 1 µV. NAME CLASS / SUBCLASS FORMAT VALID RANGE SIZE (BYTES) UNITS DEFAULT VALUE Cal Inhibit Temp Low 50 Power / Power (68) Signed Int -400 to 1200 2 0.1 °C Cal Inhibit Temp High 450 The bq20z80 TS1 and TS2 inputs, in conjunction with two identical NTC thermistors (default are Semitec 103AT), measure the battery environmental temperature. The bq20z80 can also be configured to use its internal temperature sensor. The bq20z80 updates the reported temperature each second in normal mode, and each DF:Sleep Voltage Time in Sleep mode, via SBS.Temperature( ) depending on the state of DF:Operation Cfg A [TEMP1, TEMP0]. NAME CLASS / SUBCLASS FORMAT VALID RANGE SIZE (BYTES) UNITS DEFAULT VALUE Sleep Voltage Time Power / Power (68) Integer 0 to 100 1 s 5 Operation Cfg A Configuration / Registers (64) Hex 0x0000 to 0xffff 2 N/A 0x0f29 8 |
Similar Part No. - BQ20Z80DBTR-V101G4 |
|
Similar Description - BQ20Z80DBTR-V101G4 |
|
|
Link URL |
| Privacy Policy |
| ALLDATASHEET.COM |
| Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | 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
