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BQ27421-G1

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System-side(tm) fuel gauge with integrated Sense Resistor | battery gas gauge

Data sheet
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System-side(tm) fuel gauge with integrated Sense Resistor | battery gas gauge

BQ27421-G1

ACTIVE
Data sheet Order now

Product details

Parameters

Cell chemistry Li-Ion/Li-Polymer Number of series cells Single Cell Communication interface I2C Battery capacity (Min) (mAh) 100 Battery capacity (Max) (mAh) 8000 Implementation System External capacity indication None Features Impedance Track™ algorithm, Integrated Sense Resistor Operating temperature range (C) -40 to 85 Cell balancing — open-in-new Find other Battery fuel gauges

Package | Pins | Size

DSBGA (YZF) 9 3 mm² 1.62 x 1.66 open-in-new Find other Battery fuel gauges

Features

  • Single-Cell Li-Ion Battery Fuel Gauge
    • Resides on System Board
    • Supports Embedded or Removable Batteries
    • Powered Directly from Battery with Integrated
      LDO
    • Low-Value Integrated Sense Resistor
      (7 mΩ, Typical)
  • Easy-to-Configure Fuel Gauging Based on
    Patented Impedance Track™ Technology
    • Reports Remaining Capacity and State-of-
      Charge (SOC) with Smoothing Filter
    • Automatically Adjusts for Battery Aging, Self-
      Discharge, Temperature, and Rate Changes
    • Battery State-of-Health (Aging) Estimation
  • Microcontroller Peripheral Supports:
    • 400-kHz I2C Serial Interface
    • Configurable SOC Interrupt or
      Battery Low Digital Output Warning
    • Internal Temperature Sensor or
      Host-Reported Temperature
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Description

The Texas Instruments bq27421-G1 fuel gauge is a minimally configured microcontroller peripheral that provides system-side fuel gauging for single-cell Li-Ion batteries. The device requires very little user configuration and system microcontroller firmware development.

The bq27421-G1 fuel gauge uses the patented Impedance TrackTM algorithm for fuel gauging, and provides information such as remaining battery capacity (mAh), state-of-charge (%), and battery voltage (mV).

Battery fuel gauging with the bq27421-G1 fuel gauge requires connections only to PACK+ (P+) and PACK– (P–) for a removable battery pack or embedded battery circuit. The tiny 9-ball, 1.62 mm × 1.58 mm, 0.5-mm pitch NanoFree™ chip scale package (DSBGA) is ideal for space-constrained applications.

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Technical documentation

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Type Title Date
* Datasheet bq27421-G1 System-Side Impedance Track Fuel Gauge With Integrated Sense Resistor datasheet (Rev. E) Jan. 06, 2016
* User guide bq27421-G1 Technical Reference Manual (Rev. C) Aug. 30, 2016
Technical article Get smart: How intelligent battery gauges improve battery life in continuous glucose monitors Apr. 19, 2019
Application note Benefits of Battery Gauges and Protectors in Medical Applications Jul. 02, 2018
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
Application note Gauge Communication Jan. 12, 2017
Technical article Configuring a battery fuel gauge by reading the label on the back of your battery Mar. 11, 2016
Technical article Gas gauging solutions for Li-ion batteries: Part 1 May 27, 2015
Technical article The most popular battery charging solutions for wearables Apr. 20, 2015
More literature Battery Management Solutions for Wearable and Fitness Devices (Rev. C) Aug. 18, 2014
More literature Quickstart Guide for bq27421-G1 (Rev. B) May 06, 2014
Application note Low-Power, Long Runtime Fuel Gauging Scheme Oct. 11, 2013
Application note Verification and Accuracy Test Methods of Gas Gauges Jun. 05, 2013
Application note Going to Production With the bq274xx Family of Gas Gauges Jun. 27, 2011
Application note Single Cell Gas Gauge Circuit Design Feb. 22, 2008
Application note Single Cell Impedance Track Printed-Circuit Board Layout Feb. 22, 2008
Application note Theory and Implementation of Impedance Track Battery Fuel-Gauging Algorithm Jan. 31, 2008

Design & development

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

Hardware development

EVALUATION BOARD Download
document-generic User guide
99
Description

System-Side Battery Fuel (Gas) Gauge Solution Evaluation Module

The BQ27421EVM-G1A evaluation module is a complete evaluation system for the bq27421. The EVM includes one bq27421 circuit module with an integrated current-sense resistor. A separated orderable EV2400 PC interface board for gas gauge (...)
Features
  • Populated circuit module for quick setup and evaluation.
  • Downloadable software that can be used for data logging and analysis.


  • Related Terms:
    • Battery Fuel Gauge Integrated circuit
    • Battery Fuel Gauge IC
    • Battery Fuel Gauge Circuit
View details
EVALUATION BOARD Download
document-generic User guide
99
Description

System-Side Battery Fuel (Gas) Gauge Solution Evaluation Module

The BQ27421EVM-G1B evaluation module is a complete evaluation system for the bq27421. The EVM includes one bq27421 circuit module with an integrated current-sense resistor. A separated orderable EV2300 or EV2400 PC interface board for (...)
Features
  • Populated circuit module for quick setup and evaluation.
  • Downloadable software that can be used for data logging and analysis.


  • Related Terms:
    • Battery Fuel Gauge Integrated circuit
    • Battery Fuel Gauge IC
    • Battery Fuel Gauge Circuit
    View details
    INTERFACE ADAPTER Download
    document-generic User guide
    199
    Description

    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 (...)

    Features
    • Fully powered from the USB port
    • Optional 5-V port for powering high power voltage drivers (future upgrade)
    • Complete interface between the USB and SMBus, I2C (8/16) interfaces
    • Expansion port for future upgrades
    View details

    Software development

    APPLICATION SOFTWARE & FRAMEWORK Download
    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 (...)
    Features
    • 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 
    View details
    DRIVER OR LIBRARY Download
    Linux Driver for BQ27XXX
    BQ27XXXSW-LINUX — The Linux driver supports the BQ27x series of Battery Fuel Gauges. The Linux driver supports communication through the I2C/HDQ bus and interfaces with the power supply sub-system to monitor battery properties.

     

    Linux Mainline Status

    Available in Linux Main line: Yes
    Available through git.ti.com: N/A

    (...)

    Reference designs

    REFERENCE DESIGNS Download
    500mA Wireless Charger BoosterPack with Gauge Reference Design
    TIDA-00669 — The TIDA-00669 is a BoosterPack reference design that provides a wireless charger and an entire battery managment solution to power any TI LaunchPad (www.ti.com/launchpad). This design is a  highly integrated power management solution that is well-suited for low power applications. The primary (...)
    document-generic Schematic document-generic User guide
    REFERENCE DESIGNS Download
    Smartwatch Battery Management Solution Reference Design
    TIDA-00712 — The TI design TIDA-00712 is a reference design for Smartwatch BMS (Battery Management Solution); It’s suitable for low power wearable devices like smartwatch applications. The design includes an ultra-low current 1 cell Li-ion linear charger; a highly integrated Qi-compliant wireless power (...)
    document-generic Schematic document-generic User guide
    REFERENCE DESIGNS Download
    Gauge Booster Pack Reference Design
    TIDA-00586 — The TIDA-00586 reference design is a gauge that has been designed as a booster pack to fit on the TI Launchpad development boards. The use of this this board for development will reduce the time spent in design and test of the bq27421 gauge IC. You can select any appropriate charger to charge your (...)
    document-generic Schematic document-generic User guide
    REFERENCE DESIGNS Download
    Standalone Synchronous Switch-mode Li-Ion Charger with 2A FET Reference Design
    TIDA-00055 — This reference design is a solution for a Li-Ion charge management IC. It has a highly integrated battery charge IC utilizing synchronous switch mode power conversion for efficient and comprehensive charge control of a single cell Li-Ion battery. The solutionprovides a convenient method to evaluate (...)
    document-generic Schematic document-generic User guide
    REFERENCE DESIGNS Download
    1A Single Cell Linear Charger for LiFePO4 Applications Reference Design
    TIDA-00053 — This reference design is designed to deliver up to 1 A of continuous current to the battery and/or system. It has a 4.9 VDC, 50 mA max internal LDO that can be used for USB applications or any other need. It uses the bq25070, a highly integrated LiFePO4 linear battery charger, in order to target the (...)
    document-generic Schematic document-generic User guide
    REFERENCE DESIGNS Download
    Single-Chip Charge and Dynamic Power-Path Management IC Reference Design
    TIDA-00045 — This reference design is a Single-Chip Charge and Dynamic Power-Path Management IC solution. It is a complete bq24030 based circuit design and provides a convenient method to evaluate the operation and performance of the IC. The development solution includes a tested evaluation board; a user guide (...)
    document-generic Schematic document-generic User guide
    REFERENCE DESIGNS Download
    USB Li-Ion Battery Charger and Power-Path Management Reference Design
    TIDA-00044 — This reference solution is designed to deliver up to 1000mA of continuous current to the battery output when programmed with a resistor on the ISET pin and is programmed at the factory for ~540mA. The USB current limit modes are selected by the ISET2 pin and limits current to a maximum of 500mA (...)
    document-generic Schematic document-generic User guide
    REFERENCE DESIGNS Download
    1A Single-Input Single-Cell Li-Ion Battery Charger Reference Design
    TIDA-00042 — This reference design is targeted at space-limited portable applications. The devices in the design operate from either a USB port or AC adapter. The solution has a single power output that charges the battery. A system load can be placed in parallel with the battery as long as the average system (...)
    document-generic Schematic document-generic User guide
    REFERENCE DESIGNS Download
    System-Side ImpedanceTrack Fuel Gauge with Integrated Sense Resistor Reference Design
    TIDA-00031 — This reference design is a complete evaluation system solution for the bq27421. The solution includes one bq27421 circuit module with an integrated current-sense resistor. A separated orderable EV2300 or EV2400 PC interface board for gas gauge interface along with a PC USB cable, and (...)
    document-generic Schematic document-generic User guide

    CAD/CAE symbols

    Package Pins Download
    DSBGA (YZF) 9 View options

    Ordering & quality

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    • REACH
    • Device marking
    • Lead finish/Ball material
    • MSL rating/Peak reflow
    • MTBF/FIT estimates
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    • Qualification summary
    • Ongoing reliability monitoring

    Recommended products may have parameters, evaluation modules or reference designs related to this TI product.

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