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BQ2083DBT-V1P3 Datasheet(PDF) 8 Page - Texas Instruments |
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BQ2083DBT-V1P3 Datasheet(HTML) 8 Page - Texas Instruments |
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8 / 55 page  bq2083-V1P2 SLUS573 − JULY 2003 www.ti.com 8 FUNCTIONAL DESCRIPTION General Operation The bq2083−V1P2 determines battery capacity by monitoring the amount of charge input or removed from a rechargeable battery. In addition to measuring charge and discharge, the bq2083−V1P2 measures battery voltage, temperature, and current, estimates battery self-discharge, and monitors the battery for low-voltage thresholds. The bq2083−V1P2 measures charge and discharge activity by monitoring the voltage across a small-value series sense resistor between the battery’s negative terminal and the negative terminal of the battery pack. The available battery charge is determined by monitoring this voltage and correcting the measurement for environmental and operating conditions. The bq2083−V1P2 interfaces with the bq29311 to perform battery protection, cell balancing and voltage translation functions. The bq2083−V1P2 can accept any NTC thermistor (default is Semitec 103AT) for temperature measurement or can be configured to use its internal temperature sensor. The bq2083−V1P2 uses temperature to monitor the battery pack and to compensate the self-discharge estimate. Measurements The bq2083−V1P2 uses an integrating sigma-delta analog-to-digital converter (ADC) for current measurement and a second sigma delta ADC for battery voltage and temperature measurement. Voltage, current, and temperature measurements are made every second. Charge and Discharge Counting The integrating ADC measures the charge and discharge flow of the battery by monitoring a small-value sense resistor between the SR1 and SR2 pins as shown in the schematic. The integrating ADC measures bipolar signals from −0.3 to 1.0 V. The bq2083−V1P2 detects charge activity when VSR = V(SR1)–V(SR2) is positive and discharge activity when VSR = V(SR1)–V(SR2) is negative. The bq2083−V1P2 continuously integrates the signal over time, using an internal counter. The fundamental rate of the counter is 2.6 nVh. The bq2083−V1P2 updates Remaining Capacity( ) with the charge or discharge accumulated in this internal counter once every second. Offset Calibration The bq2083−V1P2 provides an autocalibration feature to cancel the voltage offset error across SR1 and SR2 for maximum charge measurement accuracy. The bq2083−V1P2 performs autocalibration when the SMBus lines stay low for a minimum of 20 s. The bq2083−V1P2 is capable of automatic offset calibration down to 1 µV. Digital Filter The bq2083−V1P2 does not measure charge or discharge counts below the digital filter threshold. The digital filter threshold is programmed in the Digital Filter DF 0x2b and should be set sufficiently high to prevent false signal detection with no charge or discharge flowing through the sense resistor. Voltage While monitoring SR1 and SR2 for charge and discharge currents, the bq2083−V1P2 monitors the individual series cell voltages through the bq29311. The bq2083−V1P2 configures the bq29311 to present the selected cell to the VCELL pin of the bq29311 which should be connected to VIN of the bq2083−V1P2. The internal ADC of the bq2083−V1P2 then measures the voltage and scales it appropriately. The bq2083−V1P2 then reports the Voltage( ) and the individual cell voltages in VCELL1, VCELL2, VCELL3, and VCELL4 located in 0x3c−0x3f. Current The bq2083−V1P2 uses the SR1 and SR2 inputs to measure and calculate the battery charge and discharge current as represented in the data register Current( ). Temperature The TS input of the bq2083−V1P2 in conjunction with an NTC thermistor measures the battery temperature as shown in the schematic. The bq2083−V1P2 reports temperature in Temperature( ). The bq2083−V1P2 can also be configured to use its internal temperature sensor by setting the IT bit in Misc Configuration DF 0x2a. Data flash locations DF 0xa4 through DF 0xad also have to be changed to prescribed values if the internal temperature sensor option is selected. |
Similar Part No. - BQ2083DBT-V1P3 |
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Similar Description - BQ2083DBT-V1P3 |
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