Product details


Cell chemistry Li-Ion/Li-Polymer Communication interface SMBus Battery capacity (Min) (mAh) 500 Battery capacity (Max) (mAh) 15000 External capacity indication LED Operating temperature range (C) -20 to 85 open-in-new Find other Battery fuel gauges

Package | Pins | Size

TSSOP (DBT) 38 43 mm² 4.4 x 9.7 open-in-new Find other Battery fuel gauges


  • Provides Accurate Measurement of Available Charge in Li-Ion and Li-Polymer Batteries
  • Supports the Smart Battery Specification (SBS) V1.1
  • Integrated Time Base Removes Need for External Crystal
  • Works With the TI bq29311 Analog Front End (AFE) Protection IC to Provide Complete Pack Electronics for 10.8-V or 14.4-V Battery Packs With Few External Components
  • Based on a Powerful Low-Power RISC CPU Core With High-Performance Peripherals
  • Integrated FLASH Memory Eliminates the Need for External Configuration EEPROM
  • Measures Charge Flow Using a High Resolution 16-Bit Integrating Converter
    • Better Than 3-nVh of Resolution
    • Self-Calibrating
    • Offset Error Less Than 1-uV
  • Uses 16-Bit Delta Sigma Converter for Accurate Voltage and Temperature Measurements
  • Programmable Cell Modeling for Maximum Battery Fuel Gauge Accuracy
  • Drives 3-, 4-, or 5-Segment LED Display for Remaining Capacity Indication
  • 38-Pin TSSOP (DBT)
    • Notebook PCs
    • Medical and Test Equipment
    • Portable Instrumentation

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The bq2085 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 bq2085 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 bq29311 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 bq2085, the host controller can manage remaining battery power to extend the system run time as much as possible.

The bq2085 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 3-nVh and an offset measurement error of less than 1-uV (typical). For voltage and temperature reporting, the bq2085 uses a 16-bit A-to-D converter. In conjunction with the bq29311, the onboard ADC also monitors individual cell voltages in a battery pack and allows the bq2085 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 bq2085 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 bq2085 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.

The bq2085 contains 512 bytes of internal data flash memory, which store configuration information. The information includes nominal capacity and voltage, self-discharge rate, rate compensation factors, and other programmable cell-modeling factors used to accurately adjust remaining capacity for use-conditions based on time, rate, and temperature. The bq2085 also automatically calibrates or learns the true battery capacity in the course of a discharge cycle from programmable near full to near empty levels.

The bq29311 AFE protection IC provides power to the bq2085 from a 3 or 4 series Li-ion cell stack, eliminating the need for an external regulator circuit.

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Technical documentation

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Type Title Date
* Datasheet SBS-Complaint Gas Gauge IC Use With The bq29311 datasheet Sep. 26, 2002
Application note bq2083, bq2084, and bq2085 Calibration Procedure (Rev. A) Sep. 15, 2004
Application note Cell-Balancing in the bq208x Advanced Gas Gauge Solutions Mar. 17, 2004
Application note bq2083 and bq2085 Board Offset Characterization and Compensation Jan. 30, 2004
Application note Avoiding Clock Jitter with the bq2085 Advanced Gas Gauge Oct. 20, 2003

Design & development

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Software development

Gauging Parameter Calculator for CEDV gauges
GPCCEDV Gauging Parameter Calculator (GPC) is a math calculation and simulation tool that helps the battery designer to obtain matching Compensated End of Discharge Voltage (CEDV) coefficients for the specific battery profile. The tool allows the user to increase the accuracy of the fuel gauge IC over (...)
SLVC167.ZIP (4294 KB)

Design tools & simulation

document-generic User guide
SLUC042.ZIP (1031 KB)

CAD/CAE symbols

Package Pins Download
TSSOP (DBT) 38 View options

Ordering & quality

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