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BQ27Z561-R2 ACTIVE Impedance track battery gas gauge solution for 1-series cell li-ion battery packs SHA-256 authentication, low-voltage (2.0 V), black box recorder, enhanced charging algorithm

Product details

Cell chemistry Li-Ion/Li-Polymer Number of series cells Single Cell Communication interface HDQ, I2C Battery capacity (min) (mAh) 100 Battery capacity (max) (mAh) 32000 Implementation Pack External capacity indication None Features Impedance Track™ algorithm, SHA-256 Authentication Operating temperature range (°C) -40 to 85 Rating Catalog
Cell chemistry Li-Ion/Li-Polymer Number of series cells Single Cell Communication interface HDQ, I2C Battery capacity (min) (mAh) 100 Battery capacity (max) (mAh) 32000 Implementation Pack External capacity indication None Features Impedance Track™ algorithm, SHA-256 Authentication Operating temperature range (°C) -40 to 85 Rating Catalog
DSBGA (YPH) 12 2.8896 mm² 2.064 x 1.4
  • Supports high-side and low-side current sense resistors: down to 1mΩ
  • SHA-256 authentication responder for increased battery pack security
  • Two independent ADCs
    • Support for simultaneous current and voltage sampling
    • High-accuracy coulomb counter with input offset error: < 1µV (typical)
  • Low-voltage operation: 2V
  • Supports pack-side gauging
  • Wide-range current applications: 1mA to > 5A
  • Active high or low interrupt pin
  • Reduced power modes (typical battery pack operating range conditions)
    • Typical SLEEP mode: < 11µA
    • Typical DEEP SLEEP mode: < 9µA
    • Typical OFF mode: < 1.9µA
  • Internal and external temperature sense functions
  • 400kHz I2C bus communications interface for high-speed programming and data access
  • HDQ one-wire for communication with host
  • Compact 12-pin DSBGA package (YPH)
  • Supports high-side and low-side current sense resistors: down to 1mΩ
  • SHA-256 authentication responder for increased battery pack security
  • Two independent ADCs
    • Support for simultaneous current and voltage sampling
    • High-accuracy coulomb counter with input offset error: < 1µV (typical)
  • Low-voltage operation: 2V
  • Supports pack-side gauging
  • Wide-range current applications: 1mA to > 5A
  • Active high or low interrupt pin
  • Reduced power modes (typical battery pack operating range conditions)
    • Typical SLEEP mode: < 11µA
    • Typical DEEP SLEEP mode: < 9µA
    • Typical OFF mode: < 1.9µA
  • Internal and external temperature sense functions
  • 400kHz I2C bus communications interface for high-speed programming and data access
  • HDQ one-wire for communication with host
  • Compact 12-pin DSBGA package (YPH)

The Texas Instruments BQ27Z561 Impedance Track™ gas gauge solution is a highly integrated, accurate, 1-series cell gas gauge with a flash programmable custom reduced instruction-set CPU (RISC) and SHA-256 authentication for Li-ion and Li-polymer battery packs. The 1-series cell capability includes parallel cells for increased capacity.

The BQ27Z561 gas gauge communicates using I2C-compatible and HDQ one-wire interfaces and includes several key features that help facilitate accurate gas gauging applications. Integrated temperature sense functions (internal and external options) enable system and battery temperature measurements. The integrated SHA-256 functionality helps enable secure identification between systems and packs. The interrupt function facilitates the BQ27Z561 device to inform the system when a state-of-charge (SOC), voltage, or temperature fault occurs. The low-voltage operation enables the system to continue monitoring the battery, even in deeply discharged conditions. During low-activity situations, the device can be set to the low power coulomb counting (CC) mode, which allows the device to continue coulomb counting while significantly reducing operating current.

The Texas Instruments BQ27Z561 Impedance Track™ gas gauge solution is a highly integrated, accurate, 1-series cell gas gauge with a flash programmable custom reduced instruction-set CPU (RISC) and SHA-256 authentication for Li-ion and Li-polymer battery packs. The 1-series cell capability includes parallel cells for increased capacity.

The BQ27Z561 gas gauge communicates using I2C-compatible and HDQ one-wire interfaces and includes several key features that help facilitate accurate gas gauging applications. Integrated temperature sense functions (internal and external options) enable system and battery temperature measurements. The integrated SHA-256 functionality helps enable secure identification between systems and packs. The interrupt function facilitates the BQ27Z561 device to inform the system when a state-of-charge (SOC), voltage, or temperature fault occurs. The low-voltage operation enables the system to continue monitoring the battery, even in deeply discharged conditions. During low-activity situations, the device can be set to the low power coulomb counting (CC) mode, which allows the device to continue coulomb counting while significantly reducing operating current.

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Technical documentation

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Top documentation Type Title Format options Date
* Data sheet BQ27Z561 Impedance Track™ Battery Gas Gauge Solution for 1-Series Cell Li-Ion Battery Packs datasheet (Rev. C) PDF | HTML 30 Sep 2025
Application note A Method to Save Time from Chem ID Ready to Pack Sample Manufacturing PDF | HTML 23 Jul 2025
Application note How to Create and Program Authentication Keys into TI Battery Fuel Gauges PDF | HTML 05 Mar 2025
User guide BQ27Z561-R2 and BQ27Z558 Technical Reference Manual (Rev. C) PDF | HTML 03 Mar 2024
Application note Battery Gauging Algorithm Comparison PDF | HTML 04 Dec 2023
Certificate BQ27Z561EVM-011 EU RoHS Declaration of Conformity (DoC) (Rev. A) 12 Jul 2022
EVM User's guide BQ27Z561EVM-011 Single-Cell Impedance Track Technology (Rev. A) PDF | HTML 12 Jul 2022
Application note End of Discharge SOC Jump Elimination PDF | HTML 06 Apr 2020
Application note BQ27Z561-R1 to BQ27Z561-R2 Change List 26 Feb 2020
Application note Impedance Track Optimization for Applications Without Significant Rest Periods 15 Oct 2019
User guide bq27z561 Technical Reference Manual 26 Jun 2018
Application note Simple Guide to Chemical ID Selection Tool (GPC) (Rev. A) 05 Jun 2018
Application note Gauge Communication 12 Jan 2017

Design & development

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

Evaluation board

BQ27Z561EVM-011 — BQ27Z561 1S-cell programmable battery manager Evaluation module

This evaluation module (EVM) is a complete evaluation system for the BQ27Z561 battery management system. The EVM includes a BQ27Z561 integrated circuit (IC) and all other components necessary to monitor and predict capacity and other parameters of a 1-series Li-ion or Li-polymer battery pack. The (...)

User guide: PDF | HTML
Not available on TI.com
Application software & framework

BQSTUDIO-STABLE Battery Management Studio (bqStudio) Software – stable version downloads for bq series of TI battery fuel gauges

Battery Management Studio (bqStudio) offers a full suite of robust tools to assist with the process of evaluating, designing with, configuring, testing, or otherwise utilizing TI Battery management products. This includes features that provide full access to registers and data memory including (...)

Supported products & hardware

Supported products & hardware

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Application software & framework

BQSTUDIO-TEST Battery Management Studio (bqStudio) Software – Beta version downloads

Battery Management Studio (bqStudio) offers a full suite of robust tools to assist with the process of evaluating, designing with, configuring, testing, or otherwise utilizing TI Battery management products. This includes features that provide full access to registers and data memory including (...)

Supported products & hardware

Supported products & hardware

Download options
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

Supported products & hardware

Download options
Software programming tool

BQ-PRODUCTION-SINGLE-CELL-SW Production software for single cell battery fuel (gas) gauges

SingleCellbqProduction offers a full suite of robust tools to assist with the process of configuring, calibrating, manufacturing and tracking printed circuit boards utilizing TI's battery battery management products. This includes features that allow writing a golden image followed by different (...)

Supported products & hardware

Supported products & hardware

Download options
Software programming tool

BQKEYPROGRAMMER — Program Key Software for Battery Fuel Gauges

Several TI Fuel Gauge products support authentication for anti-counterfeit protection of battery packs. The selection of the battery authentication scheme between SHA and ECC is left to the user to decide. bqKeyPackager is provided to package the key, and bqKeyProgrammer is provided to program the (...)
Support software

BQ27Z561-R2-DEVICE-FW BQ27Z561 Firmware

The BQ27Z561-R2-DEVICE-FW is a firmware (FW) release that can be flashed onto any existing hardware such as the BQ27Z561 or BQ27Z561-R1 product. The firmware incorporates the patented Impedance Track™ technology to create a pack-based solution that provides a rich array of features for gas (...)

Supported products & hardware

Supported products & hardware

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DSBGA (YPH) 12 Ultra Librarian

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