SBS 1.1-compliant gas gauge enabled with Impedance Track™ technology

BQ20Z70-V150

ACTIVE

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 SOC Features Impedance Track™ algorithm, SHA-1 Authentication Operating temperature range (C) -40 to 85 Cell balancing Internal
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 SOC Features Impedance Track™ algorithm, SHA-1 Authentication Operating temperature range (C) -40 to 85 Cell balancing Internal
TSSOP (PW) 20 42 mm² 6.5 x 6.4
  • Next Generation 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
  • Powerful 8-Bit RISC CPU With Ultra-Low Power Modes
  • Works With the TI bq29330 Analog Front-End (AFE) Protection IC to Provide Complete Pack Electronics Solution
  • Full Array of Programmable Protection Features
    • Voltage, Current and Temperature
  • Fully Integrated High Accurate Clock
  • Flexible Configuration for 2 to 4 Series Li-Ion and Li-Polymer Cells
  • Integrated Field Programmable FLASH Memory Eliminates the Need for External Configuration Memory
  • Smart Battery Charger Control Feature
  • Two 16-Bit Delta-Sigma Converter
    • Accurate Voltage and Temperature Measurements
    • Integrating Coloumb Counter for Charge Flow
      • Better Than 0.65 nVh of Resolution
      • Self-Calibrating
  • Supports SHA-1 Authentication
  • 20-Pin TSSOP (PW)
  • 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 Lifetime of the Battery
  • Instant Accuracy – No Learning Cycle Required
  • Supports the Smart Battery Specification SBS V1.1
  • Powerful 8-Bit RISC CPU With Ultra-Low Power Modes
  • Works With the TI bq29330 Analog Front-End (AFE) Protection IC to Provide Complete Pack Electronics Solution
  • Full Array of Programmable Protection Features
    • Voltage, Current and Temperature
  • Fully Integrated High Accurate Clock
  • Flexible Configuration for 2 to 4 Series Li-Ion and Li-Polymer Cells
  • Integrated Field Programmable FLASH Memory Eliminates the Need for External Configuration Memory
  • Smart Battery Charger Control Feature
  • Two 16-Bit Delta-Sigma Converter
    • Accurate Voltage and Temperature Measurements
    • Integrating Coloumb Counter for Charge Flow
      • Better Than 0.65 nVh of Resolution
      • Self-Calibrating
  • Supports SHA-1 Authentication
  • 20-Pin TSSOP (PW)
  • APPLICATIONS
    • Notebook PCs
    • Medical and Test Equipment
    • Portable Instrumentation

IMPEDANCE TRACK Is a trademark of Texas Instruments

The bq20z70 SBS-compliant gas gauge IC, incorporating patented Impedance Track™ technology, is designed for battery-pack or in-system installation. The bq20z70 measures and maintains an accurate record of available charge in Li-ion or Li-polymer batteries using its integrated high-performance analog peripherals. The bq20z70 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.

The bq20z70 SBS-compliant gas gauge IC, incorporating patented Impedance Track™ technology, is designed for battery-pack or in-system installation. The bq20z70 measures and maintains an accurate record of available charge in Li-ion or Li-polymer batteries using its integrated high-performance analog peripherals. The bq20z70 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 1.1 Compliant Gas Gauge Enabled w/Impedance Track Tech for bq29330 datasheet (Rev. B) 17 Oct 2006
* Errata bq20z70-v150 Errata 25 Sep 2008
* Errata Technical Reference (Rev. A) 02 Aug 2007
Application note Cell Balancing Using the bq20zxx (Rev. C) 12 Jan 2011
Application note Design 4: Support of Multiple Li-Ion Chemistries w/Impedance Track(TM) Gas Gauge (Rev. R) 15 Oct 2009
Application note Fast Cell Balancing Using External MOSFET (Rev. A) 26 Jan 2009
Application note 2-Series-Cell Considerations for Advanced Fuel Gauges 09 May 2008
Application note bq20z70-V110 to bq20z70-V150 Change List 11 Jan 2008
Application note Cell-type Specific Settings for Cell Imbalance Permanent Failure Thresholds 28 Sep 2007
Application note Quick-Start Guide for bq20zxx Family Gas Gauges (Rev. A) 04 Sep 2007
Application note bq29330 External Short Circuit Protection 22 Aug 2007
Application note bq20z70 and bq20z90 Application Book 13 Dec 2006
Application note Evaluation 7: Preparing Optimized Data Flash Constants (Rev. B) 04 Dec 2006
Application note Pack Assembly and the bq20zxx (Rev. B) 07 Nov 2006
Application note Thermistor Coefficient Calculator for TI Advanced Fuel Gauges 04 Oct 2006

Design & development

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Evaluation board

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bq20z70EVM - bqEV-Easy SW Setup (Rev. B)

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