Product details

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  • Next Generation Patented Impedance Track™ Technology Accurately
    Measures Available Charge in Li-Ion and Li-Polymer Batteries
    • Better Than 1% Error Over the Lifetime of the Battery
  • Supports the Smart Battery Specification SBS V1.1
  • Flexible Configuration for 2-Series, 3-Series, and 4-Series
    Cell Li-Ion and Li-Polymer Batteries
  • Powerful 8-Bit RISC CPU With Ultralow Power Modes
  • Full Array of Programmable Protection Features
    • Voltage, Current, and Temperature
  • Complies with JEITA Guidelines
  • Added Flexibility to Handle More Complex Charging Profiles
  • Lifetime Data Logging
  • Supports SHA-1 Authentication
  • Available in 20-Pin TSSOP (PW) and 32-Pin QFN (RSM) Packages
  • APPLICATIONS
    • Notebook PCs
    • Medical and Test Equipment
    • Portable Instrumentation

Impedance Track is a trademark of Texas Instruments.

  • Next Generation Patented Impedance Track™ Technology Accurately
    Measures Available Charge in Li-Ion and Li-Polymer Batteries
    • Better Than 1% Error Over the Lifetime of the Battery
  • Supports the Smart Battery Specification SBS V1.1
  • Flexible Configuration for 2-Series, 3-Series, and 4-Series
    Cell Li-Ion and Li-Polymer Batteries
  • Powerful 8-Bit RISC CPU With Ultralow Power Modes
  • Full Array of Programmable Protection Features
    • Voltage, Current, and Temperature
  • Complies with JEITA Guidelines
  • Added Flexibility to Handle More Complex Charging Profiles
  • Lifetime Data Logging
  • Supports SHA-1 Authentication
  • Available in 20-Pin TSSOP (PW) and 32-Pin QFN (RSM) Packages
  • APPLICATIONS
    • Notebook PCs
    • Medical and Test Equipment
    • Portable Instrumentation

Impedance Track is a trademark of Texas Instruments.

The bq20z40-R1 SBS-compliant gas gauge and protection IC, incorporating patented Impedance Track™ technology, is designed for battery-pack or in-system installation. The bq20z40-R1 measures and maintains an accurate record of available charge in Li-Ion or Li-Polymer batteries using its integrated high-performance analog peripherals. Thebq20z40-R1 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, while minimizing external 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 the remaining capacity to be calculated with discharge rate, temperature, and cell aging, which are all accounted for during each stage of every cycle.

The bq20z40-R1 SBS-compliant gas gauge and protection IC, incorporating patented Impedance Track™ technology, is designed for battery-pack or in-system installation. The bq20z40-R1 measures and maintains an accurate record of available charge in Li-Ion or Li-Polymer batteries using its integrated high-performance analog peripherals. Thebq20z40-R1 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, while minimizing external 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 the remaining capacity to be calculated with discharge rate, temperature, and cell aging, which are 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 1.1-COMPLIANT GAS GAUGE ENABLED WITH IMPEDANCE TRACK™ datasheet (Rev. A) 24 Mar 2011
Application note Wide-Vin Battery-Charger Using SMBus MSP430 MCUs and bq Fuel Gauges (Rev. B) PDF | HTML 12 Jul 2019
Application note Configuring the bq20z40/bq20z45 Data Flash (Rev. B) 11 Nov 2013
Application note Data Flash Programing and Calibrating the bq20zxx Family of Gas Gauges (Rev. E) 14 Sep 2013
User guide bq20z40-R1/45-R1 Technical Reference Manual (Rev. A) 18 Mar 2011
Analog Design Journal Fine tuning TI's Impedance Track™ battery fuel gauge with LiFePO4 cells 14 Mar 2011
Application note BQ20Z40/45 to BQ20Z40-R1/45-R1 change document 23 Feb 2011
Application note bq20z40/45/60/65 Printed-Circuit Board Layout Guide 03 Dec 2009
Application note Design 4: Support of Multiple Li-Ion Chemistries w/Impedance Track(TM) Gas Gauge (Rev. R) 15 Oct 2009
Application note bq20z40/45 and bq20z60/65 Gas Gauge Circuit Design 10 Aug 2009
Application note bq20z40/45 and bq20z60/65 EVM Data Flash Settings for Number of Serial Cells 07 Aug 2009
Application note bq20z40/bq20z45 and bq20z60/bq20z65 Data Flash Comparison 09 Jul 2009
Application note bq20z40/bq20z45 Change List 29 Jun 2009
Application note bq20z70 and bq20z90 Application Book 13 Dec 2006
Application note Thermistor Coefficient Calculator for TI Advanced Fuel Gauges 04 Oct 2006

Design & development

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

Evaluation board

ADVANCED-BQMTESTER — Texas Instruments Advanced bqMTester Multi-Station Test and Program Board

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, (...)

User guide: PDF
Not available on TI.com
Design tool

GASGAUGECHEM-SW Gas gauge chemistry updater

The chemistry updater installer contains data used by the bqEvaluation / 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 (...)

Supported products & hardware

Supported products & hardware

Products
Battery fuel gauges
BQ20Z40-R1 SBS 1.1 compliant Gas Gauge with Impedance Track™ Technology BQ20Z45-R1 SBS 1.1 compliant Gas Gauge with Impedance Track™ Technology BQ20Z70-V160 SBS 1.1-compliant gas gauge enabled with Impedance Track™ technology for use with the bq29330 BQ20Z75-V160 SBS 1.1-compliant gas gauge and protection-enabled IC with Impedance Track™; BQ20Z80A-V110 SBS 1.1 compliant gas gauge enabled with Impedance Track™; technology for use with the bq29312A BQ20Z90-V150 SBS v1.1 compliant gas gauge for use with the bq29330 BQ20Z95 SBS 1.1-Compliant Gas Gauge Enabled w/Impedance Track BQ27500-V120 System-side Impedance Track™; fuel gauge with FW v1.20 BQ27500-V130 System-side Impedance Track™; fuel gauge with FW v1.30 BQ27501 Complete System side battery fuel gauge with Impedance Track™; technology BQ27505-J2 System-side Impedance Track™; fuel gauge with FW v2.15 BQ27505-J3 System-side Impedance Track™; fuel gauge with FW v2.20 BQ27505-J4 System-side Impedance Track™; fuel gauge with FW v2.24 BQ27510-G1 System-side Impedance-Track fuel gauge that provides 96 bytes of user-programmable data Flash memory BQ27541 Single cell Li-ion battery fuel gauge for battery pack Integration
Hardware development
BQEVSW

BQ evaluation software (BQEVSW) v0.0.92 for BQ30Z554-R1

Software
BQSTUDIO Battery Management Studio (bqStudio) Software
Download options
Support software

BQ20Z40-R1_BQEASY-SW — BQ20Z40-R1 bqEASY Software

bqEASY is a tool that simplifies the bq gas gauge configuration and parameter optimize process.
Support software

Gas Gauge Chemistry Updater Setup v7.82 (Rev. HY)

SLUC261HY.ZIP (496964 KB)
lock = Requires export approval (1 minute)
CAD/CAE symbol

Mathcad Chemistry Selection Tool (Rev. DJ)

SLUC138DJ.ZIP (6840 KB)
Package Pins Download
TSSOP (PW) 20 View options

Ordering & quality

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  • Qualification summary
  • Ongoing reliability monitoring

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