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) 32000 Implementation Pack External capacity indication LCD, LED Features Impedance Track™ algorithm, Integrated Protector, 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) 32000 Implementation Pack External capacity indication LCD, LED Features Impedance Track™ algorithm, Integrated Protector, SHA-1 Authentication Operating temperature range (C) -40 to 85 Cell balancing Internal
TSSOP (DBT) 44 71 mm² 11.15 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 the Lifetime of the
      Battery
  • Supports Smart Battery Specification SBS V1.1
  • Flexible Configuration for 2-Series 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
  • Drives 3, 4, or 5 Segment Liquid Crystal Display
    and LED for Battery-Pack Conditions
  • Supports SHA-1 Authentication
  • Complete Battery Protection and Gas Gauge
    Solution in One Package
  • 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 Smart Battery Specification SBS V1.1
  • Flexible Configuration for 2-Series 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
  • Drives 3, 4, or 5 Segment Liquid Crystal Display
    and LED for Battery-Pack Conditions
  • Supports SHA-1 Authentication
  • Complete Battery Protection and Gas Gauge
    Solution in One Package

The bq20z655-R1 SBS-compliant gas gauge and protection IC, incorporating patented Impedance Track™ technology, is a single IC solution designed for battery-pack or in-system installation. The bq20z655-R1 measures and maintains an accurate record of available charge in Li-ion or Li-polymer batteries using its integrated high-performance analog peripherals. The bq20z655-R1 monitors capacity change, battery impedance, open-circuit voltage, and other critical parameters of the battery pack which reports the information to the system host controller over a serial-communication bus. Together with the integrated analog front-end (AFE) short circuit and overload protection, the bq20z655-R1 maximizes functionality and safety while minimizing external component count, cost, and size in smart battery circuits.

The implemented Impedance Track™ gas gauging 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 with high accuracy.

The bq20z655-R1 SBS-compliant gas gauge and protection IC, incorporating patented Impedance Track™ technology, is a single IC solution designed for battery-pack or in-system installation. The bq20z655-R1 measures and maintains an accurate record of available charge in Li-ion or Li-polymer batteries using its integrated high-performance analog peripherals. The bq20z655-R1 monitors capacity change, battery impedance, open-circuit voltage, and other critical parameters of the battery pack which reports the information to the system host controller over a serial-communication bus. Together with the integrated analog front-end (AFE) short circuit and overload protection, the bq20z655-R1 maximizes functionality and safety while minimizing external component count, cost, and size in smart battery circuits.

The implemented Impedance Track™ gas gauging 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 with high accuracy.

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Technical documentation

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Type Title Date
* Data sheet bq20z655-R1 SBS 1.1-Compliant Gas Gauge and Protection Enabled With Impedance Track™ datasheet (Rev. A) PDF | HTML 17 Jun 2015
* User guide bq20Z655 Technical Reference Manual (Rev. A) 16 Oct 2014
Application note Achieving The Successful Learning Cycle 19 Jun 2018
Application note Simple Guide to Chemical ID Selection Tool (GPC) (Rev. A) 05 Jun 2018
Application note Gauge Communication 12 Jan 2017
Application note bq20z655-R1 Change Notice 27 Oct 2011

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, (...)

Not available on TI.com
Evaluation board

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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 (...)

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Support software

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

SLUC261HY.ZIP (496964 KB)
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Support software

bqEVSW - Evaluation software for bq20z655-R1

SLUC304.ZIP (27208 KB)
CAD/CAE symbol

Mathcad Chemistry Selection Tool (Rev. DJ) Mathcad Chemistry Selection Tool (Rev. DJ)

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TSSOP (DBT) 44 View options

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