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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
BQ27Z746 ACTIVE Pack-side, single-cell Impedance Track™ technology fuel gauge with integrated protector Integrated protection, SHA-256 authentication, low-voltage (2.0 V) operation, black box recorder

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) 29000 Implementation Pack External capacity indication None Features Impedance Track™ algorithm 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) 29000 Implementation Pack External capacity indication None Features Impedance Track™ algorithm Operating temperature range (°C) -40 to 85 Rating Catalog
TSSOP (PW) 20 41.6 mm² 6.5 x 6.4
  • Comprehensive Battery Fuel Gauge for Single Cell and 1-Series Li-Ion/Li-Polymer Applications
  • Secure Battery Authentication Using SHA-1/HMAC Encryption
  • Calculates and Reports
    • Remaining Battery Capacity
    • Battery Voltage and Temperature
    • Charge and Discharge Current
    • Four Time-to-Empty Predictions
  • Battery Fuel Gauge Based on Patented Impedance Track Technology
    • Models the Battery Discharge Curve for Accurate Time-to-Empty Predictions
    • Automatically Adjusts for Battery Aging, Battery Self Discharge, and Temperature/Rate Inefficiencies
    • Low Value Sense Resistor (10m or Less)
  • 96-Bytes Non-Volatile Scratch Pad Data Memory
  • I2C Communications Interface to the Host
  • 20-Pin TSSOP Package
  • APPLICATIONS
    • POS Terminals
    • Industrial Data Collection
    • Smartphones
    • PDAs
    • Digital Cameras
    • Handheld Terminals
  • Comprehensive Battery Fuel Gauge for Single Cell and 1-Series Li-Ion/Li-Polymer Applications
  • Secure Battery Authentication Using SHA-1/HMAC Encryption
  • Calculates and Reports
    • Remaining Battery Capacity
    • Battery Voltage and Temperature
    • Charge and Discharge Current
    • Four Time-to-Empty Predictions
  • Battery Fuel Gauge Based on Patented Impedance Track Technology
    • Models the Battery Discharge Curve for Accurate Time-to-Empty Predictions
    • Automatically Adjusts for Battery Aging, Battery Self Discharge, and Temperature/Rate Inefficiencies
    • Low Value Sense Resistor (10m or Less)
  • 96-Bytes Non-Volatile Scratch Pad Data Memory
  • I2C Communications Interface to the Host
  • 20-Pin TSSOP Package
  • APPLICATIONS
    • POS Terminals
    • Industrial Data Collection
    • Smartphones
    • PDAs
    • Digital Cameras
    • Handheld Terminals

The Texas Instruments’ bq27350 is a battery fuel gauge with secure authentication support for single cell Li-Ion/Li-Polymer battery packs. Designed for battery pack integration, the device requires little host microcontroller firmware support for implementation. The system host processor communicates with the bq27350 over an I2C interface to obtain remaining battery capacity, system run-time predictions, and other critical battery information.

The bq27350 uses the patented Impedance Track™ algorithm for its fuel gauging. The gauge provides information such as state-of-charge (%), run-time to empty (min.), charge time to full (min.), battery voltage (V), and pack temperature (°C).

The bq27350 also features both integrated and external support for secure battery pack authentication, using the SHA-1/HMAC authentication algorithm.

The Texas Instruments’ bq27350 is a battery fuel gauge with secure authentication support for single cell Li-Ion/Li-Polymer battery packs. Designed for battery pack integration, the device requires little host microcontroller firmware support for implementation. The system host processor communicates with the bq27350 over an I2C interface to obtain remaining battery capacity, system run-time predictions, and other critical battery information.

The bq27350 uses the patented Impedance Track™ algorithm for its fuel gauging. The gauge provides information such as state-of-charge (%), run-time to empty (min.), charge time to full (min.), battery voltage (V), and pack temperature (°C).

The bq27350 also features both integrated and external support for secure battery pack authentication, using the SHA-1/HMAC authentication algorithm.

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Technical documentation

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Type Title Date
* Data sheet Single Cell Li-Ion/Li-Polymer Battery Manager w Impedance Track Fuel Gauge Tech datasheet (Rev. B) 17 Dec 2009
White paper Understanding Functional Safety FIT Base Failure Rate Estimates per IEC 62380 and SN 29500 (Rev. A) PDF | HTML 30 Apr 2024
Application note Single-Cell Impedance Track Gas Gauge for Novices 16 Jun 2007
Application note Configuring the bq27350 Data Flash 19 Apr 2007

Design & development

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

Support software

SLUC070 Multiple Li-Ion Chemistries Software

Supported products & hardware

Supported products & hardware

Products
Battery fuel gauges
BQ27350 Single cell Li-ion battery manager with Impedance Track™ fuel gauge technology
Support software

SLUC115 bqEVSWSetup00.09.59_bq27350v1.00

Supported products & hardware

Supported products & hardware

Products
Battery fuel gauges
BQ27350 Single cell Li-ion battery manager with Impedance Track™ fuel gauge technology
Package Pins CAD symbols, footprints & 3D models
TSSOP (PW) 20 Ultra Librarian

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