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BQ2084 Datasheet(PDF) 1 Page - Texas Instruments |
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BQ2084 Datasheet(HTML) 1 Page - Texas Instruments |
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1 / 63 page  bq2084 SLUS550C − DECEMBER 2002 − REVISED JULY 2004 SBS v1.1 COMPLIANT GAS GAUGE FOR USE WITH THE bq29312 9,7 mm x 6,4 mm FEATURES D Provides Accurate Measurement of Available Charge in Li-Ion and Li-Polymer Batteries D Supports the Smart Battery Specification (SBS) V1.1 D Integrated Time Base Removes Need for External Crystal with Optional Crystal input D Works With the TI bq29312 Analog Front End (AFE) Protection IC to Provide Complete Pack Electronics for 7.2-V, 10.8-V or 14.4-V Battery Packs With Few External Components D Based on a Powerful Low-Power RISC CPU Core With High-Performance Peripherals D Integrated FLASH Memory Eliminates the Need for External Configuration EEPROM D Uses 16-Bit Delta Sigma Converter for Accurate Voltage and Temperature Measurements D Measures Charge Flow Using a High Resolution 16-Bit Integrating Converter − Better Than 0.65-nVh of Resolution − Self-Calibrating − Offset Error Less Than 1- µV D Programmable Cell Modeling for Maximum Battery Fuel Gauge Accuracy D Drives 3-, 4-, or 5-Segment LED Display for Remaining Capacity Indication D 38-Pin TSSOP (DBT) APPLICATIONS D Notebook PCs D Medical and Test Equipment D Portable Instrumentation DESCRIPTION The bq2084 SBS-compliant gas gauge IC for battery pack or in-system installation maintains an accurate record of available charge in Li-ion or Li-polymer batteries. The bq2084 monitors capacity and other critical parameters of the battery pack and reports the information to the system host controller over a serial communication bus. It is designed to work with the bq29312 analog front-end (AFE) protection IC to maximize functionality and safety and minimize component count and cost in smart battery circuits. Using information from the bq2084, the host controller can manage remaining battery power to extend the system run time as much as possible. The bq2084 uses an integrating converter with continuous sampling for the measurement of battery charge and discharge currents. Optimized for coulomb counting in portable applications, the self-calibrating integrating converter has a resolution better than 0.65-nVh and an offset measurement error of less than 1- µV (typical). For voltage and temperature reporting, the bq2084 uses a 16-bit A-to-D converter. In conjunction with the bq29312, the onboard ADC also monitors the pack and individual cell voltages in a battery pack and allows the bq2084 to generate the control signals necessary to implement the cell balancing and the required safety protection for Li-ion and Li-polymer battery chemistries. The bq2084 supports the Smart Battery Data (SBData) commands and charge-control functions. It communicates data using the System Management Bus (SMBus) 2-wire protocol. The data available include the battery’s remaining capacity, temperature, voltage, current and remaining run-time predictions. The bq2084 provides LED drivers and a push-button input to depict remaining battery capacity from full to empty in 20%, 25%, or 33% increments with a 3-, 4-, or 5-segment display. PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. www.ti.com Copyright 2004, Texas Instruments Incorporated |
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