BQ2084

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. BQ2084 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-V (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.