Product details


Cell chemistry Li-Ion/Li-Polymer, LiFePO4 Number of series cells Single Cell Communication interface HDQ, I2C Battery capacity (Min) (mAh) 100 Battery capacity (Max) (mAh) 30000 Implementation Pack External capacity indication None Features Impedance Track™ algorithm, SHA-256 Authentication Operating temperature range (C) -40 to 85 Cell balancing open-in-new Find other Battery fuel gauges

Package | Pins | Size

DSBGA (YPH) 12 3 mm² 2.09 x 1.715 open-in-new Find other Battery fuel gauges


  • Supports current sense resistors down to 1 mΩ
  • Supports pack-side gauging including enhanced state of health (SOH) algorithm
  • Fast QMAX update option based on predicted OCV
  • SHA-256 authentication responder for increased battery pack security
  • Sophisticated charge algorithms:
    • JEITA
    • Enhanced charging
    • RSOC charging compensation option
  • Two independent ADCs
    • Support for simultaneous current and voltage sampling
    • High-accuracy coulomb counter with input offset error < 1 µV (typical)
  • Low-voltage (2-V) operation
  • Wide-range current applications (1 mA to > 5 A)
  • Active high or low pulse or level interrupt pin
  • Supports battery trip point (BTP)
  • Reduced power modes (typical battery pack operating range conditions)
    • Typical SLEEP mode: < 11 µA
    • Typical DEEP SLEEP mode: < 9 µA
    • Typical OFF mode: < 1.9 µA
  • Internal and external temperature sense functions
  • Diagnostic lifetime data monitor and black box recorder
  • 400-kHz I2C bus communications interface for high-speed programming and data access
  • HDQ one-wire for communication with host
  • Compact 12-pin DSBGA package (YPH)
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The Texas Instruments BQ27Z561-R1 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-R1 gas gauge communicates via I2C-compatible and HDQ one-wire interfaces and includes several key features that can 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 and BTP functions facilitate the BQ27Z561-R1 device to inform the system when a specific state-of-charge (SOC), voltage, or temperature condition 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 enables the device to continue its coulomb counting while reducing operating current significantly.

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More information

Please see the BQ27z561-R2 for the latest firmware release.

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Similar functionality to the compared device.
BQ27Z561-R2 ACTIVE Impedance track battery gas gauge solution for 1-series cell li-ion battery packs BQ27Z561-R2 is the latest firmware release

Technical documentation

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Type Title Date
* Data sheet BQ27Z561-R1 Impedance Track™ Battery Gas Gauge Solution for 1-Series Cell Li-ion Battery Packs datasheet (Rev. A) Aug. 06, 2019
Application note BQ27Z561-R1 to BQ27Z561-R2 Change List Feb. 26, 2020
Technical article Get smart: How intelligent battery gauges improve battery life in continuous glucose monitors Apr. 19, 2019
Application note BQ27Z561 to BQ27Z561-R1 Change List Apr. 18, 2019
User guide BQ27Z561-R1 Technical Reference Manual Mar. 26, 2019
Application note Achieving The Successful Learning Cycle Jun. 19, 2018
Application note Simple Guide to Chemical ID Selection Tool (GPC) (Rev. A) Jun. 05, 2018
User guide Simple Guide to CEDV Data Collection for Gauging Parameter Calculator (GPC) (Rev. B) Jan. 30, 2018
Application note Gauge Communication Jan. 12, 2017

Design & development

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

Hardware development

document-generic User guide
This evaluation module (EVM) is a complete evaluation system for the bq27z561 battery management system. The EVM includes bq27z561  and bq2980  circuit modules and a link to Windows® based PC software. The circuit modules includes bq27z561 and bq2980 integrated circuits (ICs), and all (...)
  • Easy to use impedance track gas gauge
  • Accurate cell current, temperature and voltage monitoring
  • Over-voltage, under-voltage, over-current, over-temperature and under-temperature protection
  • 1-mOhm sense resistor
  • On-board EV2400
  • On-board dual programmable chargers

Software development

BQ27Z561 firmware: impedance track battery gas gauge solution for 1-s cell li-ion battery
BQ27Z561-R2-DEVICE-FW 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 (...)
  • Supports pack-side gauging including enhanced state of health (SOH) algorithm
  • Fast QMax update option based on predicted OCV
  • SHA-256 authentication responder for increased battery pack security
  • Sophisticated charge algorithms:
    • JEITA
    • Enhanced charging
    • RSOC() charging compensation option
  • Added hibernate mode (...)
Battery Management Studio (bqStudio) Software
BQSTUDIO 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 (...)
  • Real-time Gauge Dashboard for monitoring basic registers
  • Full register access and logging
  • Full data memory access and logging
  • Product configuration and monitoring tools
  • Import and export of product configurations
  • Calibration and test automation
  • Export of FS files for the target production environment 
SLUC665.ZIP (135883 KB)
SLUC666.ZIP (140691 KB)
Program Key Software for Battery Fuel Gauges
BQKEYPROGRAMMER 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 (...)
  • Supports multiple TI gauge devices that support authentication
  • Supports SHA1, SHA256, and ECC key packaging depending on the device
  • Keeps key hidden from packmaker for additional security in the manufacturing process

CAD/CAE symbols

Package Pins Download
DSBGA (YPH) 12 View options

Ordering & quality

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  • Lead finish/Ball material
  • MSL rating/Peak reflow
  • MTBF/FIT estimates
  • Material content
  • Qualification summary
  • Ongoing reliability monitoring

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