SBS v1.1 compliant gas gauge for use with the bq29330



Product details


Cell chemistry Li-Ion/Li-Polymer Number of series cells 2-4 Cells Communication interface SMBus Battery capacity (Min) (mAh) 800 Battery capacity (Max) (mAh) 15000 Implementation Pack External capacity indication LED Features Impedance Track™ algorithm, SHA-1 Authentication Operating temperature range (C) -40 to 85 Cell balancing Internal open-in-new Find other Battery fuel gauges

Package | Pins | Size

TSSOP (DBT) 30 34 mm² 4.4 x 7.8 open-in-new Find other Battery fuel gauges


  • Patented Impedance Track™ Technology Accurately Measures Available Charge in Li-Ion and Li-Polymer Batteries
  • Better than 1% Error Over Lifetime of the Battery
  • Instant Accuracy — No Learning Cycle Required
  • Automatically adjusts for battery aging, battery self discharge and temperature inefficiencies
  • Supports the Smart Battery Specification SBS V1.1
  • Works With the TI bq29330 Analog Front-End (AFE) Protection IC to Provide Complete Pack Electronics Solution
  • Full Array of Programmable Voltage, Current, and Temperature Protection Features
  • Integrated Time Base Removes Need for External Crystal with Optional Crystal Input
  • Electronics for 7.2-V, 10.8-V or 14.4-V Battery Packs With 50% Fewer External Components
  • Based on a Powerful Low-Power RISC CPU Core With High-Performance Peripherals
  • Integrated Field Programmable FLASH Memory Eliminates the Need for External Configuration Memory
  • Measures Charge Flow Using a High-Resolution, 16-Bit Integrating Delta-Sigma Converter
    • Better Than 0.65 nVh of Resolution
    • Self-Calibrating
  • Uses 16-Bit Delta-Sigma Converter for Accurate Voltage and Temperature Measurements
  • Extensive Data Reporting Options For Improved System Interaction
  • Optional Pulse Charging Feature for Improved Charge Times
  • Drives 3-, 4- or 5-Segment LED Display for Remaining Capacity Indication
  • Supports SHA-1 Authentication
  • Lifetime Data Logging
  • 30-Pin TSSOP (DBT)
    • Notebook PCs
    • Medical and Test Equipment
    • Portable Instrumentation

IMPEDANCE TRACK is a trademark of Texas Instruments.

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The bq20z90 SBS-compliant gas gauge IC, incorporating patented Impedance Track™ technology, is designed for battery-pack or in-system installation. The bq20z90 measures and maintains an accurate record of available charge in Li-ion or Li-polymer batteries using its integrated high-performance analog peripherals. The bq20z90 monitors capacity change, battery impedance, open-circuit voltage, 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 bq29330 analog front-end (AFE) protection IC to maximize functionality and safety, and minimize component count and cost in smart battery circuits.

The Impedance Track technology continuously analyzes the battery impedance, resulting in superior gas-gauging accuracy. This enables remaining capacity to be calculated with discharge rate, temperature, and cell aging all accounted for during each stage of every cycle.

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Technical documentation

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Type Title Date
* Data sheet SBS v1.1 Compliant Gas Gauge for Use With the bq29330* datasheet Jun. 28, 2007
* Errata Technical Reference (Rev. A) Aug. 06, 2007
Application note Wide-Vin Battery-Charger Using SMBus MSP430 MCUs and bq Fuel Gauges (Rev. B) Jul. 12, 2019
Application note Cell Balancing Using the bq20zxx (Rev. C) Jan. 12, 2011
Application note Design 4: Support of Multiple Li-Ion Chemistries w/Impedance Track(TM) Gas Gauge (Rev. R) Oct. 15, 2009
Application note Fast Cell Balancing Using External MOSFET (Rev. A) Jan. 26, 2009
Application note 2-Series-Cell Considerations for Advanced Fuel Gauges May 09, 2008
Application note bq20z90-V110 to bq20z90-V150 Change List Jan. 11, 2008
Application note Cell-type Specific Settings for Cell Imbalance Permanent Failure Thresholds Sep. 28, 2007
Application note Quick-Start Guide for bq20zxx Family Gas Gauges (Rev. A) Sep. 04, 2007
Application note bq29330 External Short Circuit Protection Aug. 22, 2007
Application note bq20z70 and bq20z90 Application Book Dec. 13, 2006
Application note Pack Assembly and the bq20zxx (Rev. B) Nov. 07, 2006
Application note bq20z80 EVM Data Flash Settings for Num of Serial Cells/Pack Cap (Rev. B) Nov. 06, 2006
Application note Thermistor Coefficient Calculator for TI Advanced Fuel Gauges Oct. 04, 2006

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Hardware development

document-generic User guide

The Texas Instruments Advanced bqMTester Multi-Station Test and Program Board is designed to calibrate and program electronic smart battery modules based on the latest Texas Instruments advanced battery gas gauges (BQ20z40 (...)

  • Programs and Calibrates Smart Battery Modules Based on the Following Devices: BQ20z40 (...)
document-generic User guide

The bqMTester from Texas Instruments is designed to calibrate and program electronic smart battery modules based on the bq20zxx and bq30zxx family of devices utilizing the patented Impedance Track ™ technology. The bqMTester software works in conjunction with the bqMTester HPA169 calibration board  (...)

  • Programs and calibrates smart battery modules based on the bq20z80.
  • Calibrates coulomb counter offset, voltage, temperature, and current.
  • Programs serial number, date, pack lot code, and other defaults obtained from a gold data flash file.
  • Test software is Windows 2000 and Windows XP compatible.
  • Data (...)
document-generic User guide

This solution, available from MKS Technology, is an alternative for the EV2300 communications transceiver. The solution from MKS Technology has been validated and works with both the BQMTESTER and ADVANCED-BQMTESTER. It has been validated and works with bq Evaluation software (bqEVSW). Using the MKS (...)

Software development

SLUC063E.ZIP (72 KB)
SLUC091D.ZIP (10084 KB)
SLUC261HY.ZIP (496964 KB)

Design tools & simulation

Gas Gauge Chemistry Updater
GASGAUGECHEM-SW The Chemistry Updater installer contains data used by the bq Evaluation/ bqEVSW / bqEASY tool for selecting the correct or closest chemical identification file for your battery pack.

The Battery Management Studio (bqStudio) chemistry update zip file contains data used by bqStudio for selecting the (...)
document-generic User guide
SLUC138DJ.ZIP (6840 KB)

CAD/CAE symbols

Package Pins Download
TSSOP (DBT) 30 View options

Ordering & quality

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