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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, LiFePO4 Number of series cells Single Cell Communication interface HDQ, I2C Battery capacity (Min) (mAh) 200 Battery capacity (Max) (mAh) 16000 Implementation Pack External capacity indication None Features Impedance Track™ algorithm, Integrated Protector, SHA-1 Authentication Operating temperature range (C) -40 to 85
Cell chemistry Li-Ion/Li-Polymer, LiFePO4 Number of series cells Single Cell Communication interface HDQ, I2C Battery capacity (Min) (mAh) 200 Battery capacity (Max) (mAh) 16000 Implementation Pack External capacity indication None Features Impedance Track™ algorithm, Integrated Protector, SHA-1 Authentication Operating temperature range (C) -40 to 85
DSBGA (YZF) 15 5 mm² 2.816 x 1.996
  • Battery Fuel Gauge and Protector for Single-Cell Li-Ion Applications
  • Microcontroller Peripheral Provides:
    • Precision 16-Bit, High-Side Coulomb Counter with Low-Value Sense Resistor
      (5 mΩ to 20 mΩ)
    • External and Internal Temperature Sensors for Battery Temperature Reporting
    • Lifetime and Current Data Logging
    • 64 Bytes of Non-Volatile Scratch Pad Flash
    • SHA-1 Authentication Capability
  • Battery Fuel Gauging Based on Patented Impedance Track™ Technology
    • Models Battery Discharge Curve for Accurate Time-To-Empty Predictions
    • Automatically Adjusts for Aging, Self-Discharge, and Temperature- and Rate-Induced Effects on Battery
  • Integrated High-side NMOS Protection FET Drive
  • Hardware-based Safety and Protection:
    • Overvoltage (OVP)
    • Undervoltage (UVP)
    • Overcurrent in Charge (OCC)
    • Overcurrent in Discharge (OCD)
    • Short-Circuit in Discharge (SCD)
  • I2C and HDQ Interface Formats for Communication with Host System
  • Ultra-Compact, 15-Ball NanoFree™ DSBGA
  • Battery Fuel Gauge and Protector for Single-Cell Li-Ion Applications
  • Microcontroller Peripheral Provides:
    • Precision 16-Bit, High-Side Coulomb Counter with Low-Value Sense Resistor
      (5 mΩ to 20 mΩ)
    • External and Internal Temperature Sensors for Battery Temperature Reporting
    • Lifetime and Current Data Logging
    • 64 Bytes of Non-Volatile Scratch Pad Flash
    • SHA-1 Authentication Capability
  • Battery Fuel Gauging Based on Patented Impedance Track™ Technology
    • Models Battery Discharge Curve for Accurate Time-To-Empty Predictions
    • Automatically Adjusts for Aging, Self-Discharge, and Temperature- and Rate-Induced Effects on Battery
  • Integrated High-side NMOS Protection FET Drive
  • Hardware-based Safety and Protection:
    • Overvoltage (OVP)
    • Undervoltage (UVP)
    • Overcurrent in Charge (OCC)
    • Overcurrent in Discharge (OCD)
    • Short-Circuit in Discharge (SCD)
  • I2C and HDQ Interface Formats for Communication with Host System
  • Ultra-Compact, 15-Ball NanoFree™ DSBGA

The Texas Instruments bq27742-G1 is a fuel gauge for single-cell Li-Ion battery packs that uses patented Impedance Track™ technology to deliver rate-, temperature-, and aging-compensated predictions of remaining battery capacity and system runtime with highest accuracy. The device also includes a fully integrated high-side protector that eliminates the need for a separate Li-Ion protection circuit and provides a full suite of high-accuracy fault detections for overvoltage, undervoltage, overcurrent in charge, overcurrent in discharge, and short-circuit in discharge conditions. The hardware protection functions offer built-in data flash-based programmability, allowing simple reconfiguration of existing devices for varying end equipment needs.

The fuel gauge provides information such as remaining battery capacity (mAh), state-of-charge (%), runtime to empty (minutes), voltage (mV), current (mA), and temperature (°C), as well as recording vital parameters throughout the lifetime of the battery. The device also supports interrupts to the host to indicate detection of a variety of important battery conditions to the system.

The DSBGA is a 15-ball package (2.78 mm × 1.96 mm) that is ideal for space-constrained applications.

The Texas Instruments bq27742-G1 is a fuel gauge for single-cell Li-Ion battery packs that uses patented Impedance Track™ technology to deliver rate-, temperature-, and aging-compensated predictions of remaining battery capacity and system runtime with highest accuracy. The device also includes a fully integrated high-side protector that eliminates the need for a separate Li-Ion protection circuit and provides a full suite of high-accuracy fault detections for overvoltage, undervoltage, overcurrent in charge, overcurrent in discharge, and short-circuit in discharge conditions. The hardware protection functions offer built-in data flash-based programmability, allowing simple reconfiguration of existing devices for varying end equipment needs.

The fuel gauge provides information such as remaining battery capacity (mAh), state-of-charge (%), runtime to empty (minutes), voltage (mV), current (mA), and temperature (°C), as well as recording vital parameters throughout the lifetime of the battery. The device also supports interrupts to the host to indicate detection of a variety of important battery conditions to the system.

The DSBGA is a 15-ball package (2.78 mm × 1.96 mm) that is ideal for space-constrained applications.

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Technical documentation

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Type Title Date
* Data sheet bq27742-G1 Single-Cell Li-Ion Battery Fuel Gauge with Programmable Hardware Protection datasheet (Rev. D) PDF | HTML 16 Jan 2018
* User guide bq27742-G1 Single-Cell Impedance Track™ Battery Fuel Gauge TRM (Rev. C) 20 Jul 2015
Technical article How to run an Impedance Track gas gauge learning cycle 02 Mar 2016
Technical article Battery Terms Decoded: Part 1 06 Mar 2015
Technical article Where’s the gauge? Part 3 11 Feb 2015
User guide bq27742EVM Single-Cell Impedance Track™ Technology Evaluation Module 31 Jan 2014

Design & development

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

Evaluation board

BQ27742EVM — bq27742-G1 Single Cell Li-ion Battery Fuel (Gas) Gauge Programmable Evaluation Module

The BQ27742EVM along with Battery Management Studio software provide the customer with tools for developing a battery fuel gauge module for placement inside a lithium-based battery pack.  Customers are able to configure the BQ27742EVM so that it can provide accurate battery fuel gauging (...)

User guide: PDF
Not available on TI.com
Interface adapter

EV2400 — USB-Based PC Interface Board for Battery Fuel (Gas) Gauge Evaluation Module

The EV2400 EVM interface board enables an IBM-compatible or other type PC (with the required driver for its particular platform) to communicate with the Texas Instruments SMBus or I2C interface gas gauges via a Universal Serial Bus (USB) port. In addition to this board, PC software is required to (...)

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

BQSTUDIO — Battery Management Studio (bqStudio) Software

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 (...)
Application software & framework

GPCCHEM — Gauging Parameter Calculator: Match chemistry for Impedance Track gauges

GPC Chemistry ID matching for Impedance Track (IT) algorithm gas gauges (Find closest chemistry match) must be done before Optimizing room temperature or low temperature performance.

Gauging Parameter Calculator Chemistry ID matching for Impedance track gas gauges (GPCCHEM) is a math calculation (...)

Firmware

Host System Calibration Method Software

SLUC606.ZIP (4083 KB)
lock = Requires export approval (1 minute)
Support software

bq27742-G1 firmware

SLUC558.ZIP (52 KB)
Reference designs

TIDA-00238 — bq27742 Complete Gauge and Protection For Single-Cell Li-ion Battery Packs

This reference design using bq27742 along with Battery Management Studio (Bqstudio) software  provides the customer with tools for develpping a battery fuel  gauge module for placement inside a lithium-based battery pack. Customers are able to configure the solution so that it can provide (...)
Test report: PDF
Schematic: PDF
Reference designs

TIDA-00030 — Pack-Side Impedance Track Fuel (Gas) Gauge Integrated Protector Reference Design

This reference design, using BQ27741 along with GaugeStudio software, provides the customer with tools for developing a battery fuel gauge module for placement inside a lithium-based battery pack. Customers are able to configure the solution so that it can provide accurate battery fuel gauging (...)
Test report: PDF
Schematic: PDF
Package Pins Download
DSBGA (YZF) 15 View options

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