BQ20Z40 is not recommended for new designs.
This product continues to be in production to support existing customers. Please consider one of these alternatives:
Same functionality with different pin-out to the compared device.
BQ40Z50-R2 ACTIVE 1-4 series Li-ion battery pack manager supporting Turbo Mode 2.0 This product is a multi-cell gauge with newer hardware.

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 to 4 Series Li-Ion and Li-Polymer Cells
  • Powerful 8-Bit RISC CPU With Ultralow Power Modes
  • Full Array of Programmable Protection Features
    • Voltage, Current, and Temperature
  • Satisfies JEITA Guidelines
  • Added Flexibility to Handle More Complex Charging Profiles
  • Lifetime Data Logging
  • Supports SHA-1 Authentication
  • Available in a 20-Pin TSSOP (PW) package
  • 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 to 4 Series Li-Ion and Li-Polymer Cells
  • Powerful 8-Bit RISC CPU With Ultralow Power Modes
  • Full Array of Programmable Protection Features
    • Voltage, Current, and Temperature
  • Satisfies JEITA Guidelines
  • Added Flexibility to Handle More Complex Charging Profiles
  • Lifetime Data Logging
  • Supports SHA-1 Authentication
  • Available in a 20-Pin TSSOP (PW) package
  • APPLICATIONS
    • Notebook PCs
    • Medical and Test Equipment
    • Portable Instrumentation

Impedance Track is a trademark of Texas Instruments.

The bq20z40 SBS-compliant gas gauge and protection IC, incorporating patented Impedance Track™ technology, is designed for battery-pack or in-system installation. The bq20z40 measures and maintains an accurate record of available charge in Li-ion or Li-polymer batteries using its integrated high-performance analog peripherals. The bq20z40 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 maximizes 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 that are all accounted for during each stage of every cycle.

The bq20z40 SBS-compliant gas gauge and protection IC, incorporating patented Impedance Track™ technology, is designed for battery-pack or in-system installation. The bq20z40 measures and maintains an accurate record of available charge in Li-ion or Li-polymer batteries using its integrated high-performance analog peripherals. The bq20z40 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 maximizes 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 that 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™ TECHNOLOGY datasheet (Rev. A) 12 Mar 2009
* Errata bq20z40 and bq20z45 Technical Reference Manual (Rev. A) 07 Mar 2012
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
Application note Thermistor Selection Guide for Texas Instruments Advanced Fuel Gauges 28 Sep 2011
Application note Fine tuning TI's Impedance Track™ battery fuel gauge with LiFePO4 cells 14 Mar 2011
More literature Журнал по применению аналоговых компонентов 1 кв. 2010 23 Sep 2010
Application note Li-ion battery-charger solutions for JEITA compliance 29 Jan 2010
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 Data Flash Programming Using the EV Software. (Rev. A) 27 Jul 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

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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

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 MKS (...)

From: MKS Technology Inc
Support software

BQ20Z40-R1 bqEASY Setup (Rev. A)

SLUC156A.EXE (12312 KB)
Support software

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

SLUC261HY.ZIP (496964 KB)
Package Pins Download
TSSOP (PW) 20 View options

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