Product details

Number of series cells 2-4 Cells Communication interface SMBus Battery capacity (min) (mAh) 800 Battery capacity (max) (mAh) 15000 External capacity indication LED Features SHA-1 Authentication Operating temperature range (°C) -40 to 85 Rating Catalog
Number of series cells 2-4 Cells Communication interface SMBus Battery capacity (min) (mAh) 800 Battery capacity (max) (mAh) 15000 External capacity indication LED Features SHA-1 Authentication Operating temperature range (°C) -40 to 85 Rating Catalog
TSSOP (DBT) 38 62.08 mm² (9.7 mm × 6.4 mm)
  • 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
  • Supports the Smart Battery Specification SBS V1.1
  • Works With the TI bq29312A 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 Few 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
    • Offset Error Less Than 1 µV
  • 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
  • 38-Pin TSSOP (DBT)
  • APPLICATIONS
    • Notebook PCs
    • Medical and Test Equipment
    • Portable Instrumentation

Impedance Track is a trademark of Texas Instruments.

  • 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
  • Supports the Smart Battery Specification SBS V1.1
  • Works With the TI bq29312A 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 Few 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
    • Offset Error Less Than 1 µV
  • 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
  • 38-Pin TSSOP (DBT)
  • APPLICATIONS
    • Notebook PCs
    • Medical and Test Equipment
    • Portable Instrumentation

Impedance Track is a trademark of Texas Instruments.

The bq20z80 SBS-compliant gas gauge IC, incorporating patented Impedance Track™ technology, is designed for battery-pack or in-system installation. The bq20z80 measures and maintains an accurate record of available charge in Li-ion or Li-polymer batteries using its integrated high-performance analog peripherals. The bq20z80 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 bq29312A 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.

The bq20z80 SBS-compliant gas gauge IC, incorporating patented Impedance Track™ technology, is designed for battery-pack or in-system installation. The bq20z80 measures and maintains an accurate record of available charge in Li-ion or Li-polymer batteries using its integrated high-performance analog peripherals. The bq20z80 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 bq29312A 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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Top documentation Type Title Format options Date
* Data sheet SBS 1.1-COMPLIANT GAS GAUGE ENABLED W/IMPEDANCE TRACK TECHNOLOGY FOR USE W/bq29 datasheet Jul 26, 2007
* Errata bq20z80-V110 Technical Reference Manual Apr 5, 2007
User guide bqMTester User's Guide (Rev. C) Jun 19, 2020
Application note SMBus Made Simple PDF | HTML Nov 9, 2016
Application note Data Flash Programing and Calibrating the bq20zxx Family of Gas Gauges (Rev. E) Sep 14, 2013
Application note Thermistor Selection Guide for Texas Instruments Advanced Fuel Gauges Sep 28, 2011
Application note Cell Balancing Using the bq20zxx (Rev. C) Jan 12, 2011
Application note Production 2: Data Flash Programming/Calibrating the bq20z80 Gas Gauges (Rev. B) (Rev. B) Jan 12, 2010
Application note Design 4: Support of Multiple Li-Ion Chemistries w/Impedance Track(TM) Gas Gauge (Rev. R) Oct 15, 2009
Application note Data Flash Programming Using the EV Software. (Rev. A) Jul 27, 2009
Application note Fast Cell Balancing Using External MOSFET (Rev. A) Jan 26, 2009
Application note Information to Provide When Reporting Issues With TI Gauges Jul 18, 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 4, 2007
Application note Evaluation 3: Theory/Implementation Impedance Track Battery Fuel-Gauging Algo (Rev. B) Dec 20, 2006
Application note Evaluation 7: Preparing Optimized Data Flash Constants (Rev. B) Dec 4, 2006
Application note Pack Assembly and the bq20zxx (Rev. B) Nov 7, 2006
Application note bq20z80 EVM Data Flash Settings for Num of Serial Cells/Pack Cap (Rev. B) Nov 6, 2006
Application note Thermistor Coefficient Calculator for TI Advanced Fuel Gauges Oct 4, 2006
User guide Using bqTester Single Site Software (Rev. A) Sep 1, 2006
Application note Battery Pack Production Flow With bq20zXX Aug 2, 2006
Application note bq20z80 Printed Circuit Board Layout Guide Jun 16, 2006
Application note Configuring the bq20z80 Data Flash Jun 15, 2006
Application note bq20z80 Application Book Jun 15, 2006
Application note Data Flash Programming Using the EV Software Jun 15, 2006
Application note Production Flow With bq20z80 Gas Gauges Jun 15, 2006
Application note Support of Multiple Chemistries Jun 15, 2006
Application note Exploring the bq20z80 Impedance Track Evaluation Kit (Rev. A) Jun 14, 2006
Application note bq20z80 Printed Circuit Board Layout Guide Mar 28, 2006
Application note Impedance Track(TM) Gas Gauge for Novices Jan 30, 2006
Application note Evaluation 1: Feature Set Comparison Between bq2084 and bq20z80 Nov 29, 2005
Application note Evaluation 6: Using SHA-1 in bq20zxx Family of Gas Gauges Nov 19, 2005
Application note bq20Z80-v101 to bq20z80-V102 Change List Nov 17, 2005
Application note Design 1: bq20z80 and bq2084 Gas Gauge Circuit Design Nov 14, 2005
Application note Design 2: Avoiding ESD and EMI Problems in bq20zxx Battery Pack Electronics Nov 11, 2005
Application note Design 3: Configuring the bq20z80 Data Flash Nov 10, 2005

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, (...)

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Evaluation board

BQMTESTER — BQMTESTER Multi Channel Test and Program Board

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  (...)

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Evaluation board

MKST-3P-ALT-EV2300 — MKS Technology alternative for EV2300 communications transceiver

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 (...)

Supported products & hardware
Application software & framework

BQEVSW — bq Evaluation Software (bqEVSW) v0.0.92 for bq30z554-R1

bq Evaluation software(bqEVSW) is a software tool to assist with the process of evaluating, designing with, configuring, testing, or otherwise utilizing the BQ30Z554-R1 TI Battery management product. It includes features that provide full access to registers and data memory including support for (...)

Supported products & hardware
Software programming tool

BQ-BMS-PROGRAMMER-SW — Command line programmers for BQ products

BQ-BATTERY-PROGRAMMER-SW software development kit (SDK) is a collection of robust software command line tools that assist with the process of programming, testing, or assembling packs that use TI Battery management products. The executables in this software work with the MKST-3P-ALT-EV2300 MKS (...)

Supported products & hardware
Support software

BQEVSW-MKST-UPDATE — Software Update to enable BQEVSW to use MKST-3P-ALT-EV2300

BQ-BATTERY-PROGRAMMER-SW software development kit (SDK) is a collection of robust software command line tools that assist with the process of programming, testing, or assembling packs that use TI Battery management products. The executables in this software work with the MKST-3P-ALT-EV2300 MKS (...)

Supported products & hardware
Support software

SLUC058 — bq20z80 Multiple Li-Ion Chemistries Software

Supported products & hardware
Support software

SLUC261 — Gas Gauge Chemistry Updater Setup v7.82

Supported products & hardware
Package Pins CAD symbols, footprints & 3D models
TSSOP (DBT) 38 Ultra Librarian

Ordering & quality

Support & training

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