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Battery fuel gauges

BQ27541

ACTIVE

Single cell Li-ion battery fuel gauge for battery pack Integration

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Data sheet

A newer version of this product is available

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Same functionality with different pin-out to the compared device.
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

BQ27541

ACTIVE
Data sheet Order now

Product details

Cell chemistry Li-Ion/Li-Polymer Number of series cells Single Cell Communication interface HDQ, I2C Battery capacity (Min) (mAh) 300 Battery capacity (Max) (mAh) 8000 Implementation Pack External capacity indication None Features Impedance Track™ algorithm, SHA-1 Authentication Operating temperature range (C) -40 to 85
Cell chemistry Li-Ion/Li-Polymer Number of series cells Single Cell Communication interface HDQ, I2C Battery capacity (Min) (mAh) 300 Battery capacity (Max) (mAh) 8000 Implementation Pack External capacity indication None Features Impedance Track™ algorithm, SHA-1 Authentication Operating temperature range (C) -40 to 85
VSON (DRZ) 12 10 mm² 4.0 x 2.5
  • Battery Fuel Gauge for 1-Series Li-Ion Applications
  • Microcontroller Peripheral Provides:
    • Accurate Battery Fuel Gauging
    • Internal Temperature Sensor for System Temperature Reporting
    • SHA-1/HMAC Authentication
    • 96 Bytes of Non-Volatile Scratch Pad FLASH
  • Battery Fuel Gauging Based on Patented Impedance Track™ Technology
    • Models 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 (5 m to 20 m)
  • HDQ and I2C™ Interface Formats for Communication with Host System
  • Small 12-pin 2,5 mm × 4 mm SON Package
  • APPLICATIONS
    • Smartphones
    • PDAs
    • Digital Still and Video Cameras
    • Handheld Terminals
    • MP3 or Multimedia Players

Impedance Track is a trademark of Texas Instruments.
I2C is a trademark of Phillips Corporation.
  • Battery Fuel Gauge for 1-Series Li-Ion Applications
  • Microcontroller Peripheral Provides:
    • Accurate Battery Fuel Gauging
    • Internal Temperature Sensor for System Temperature Reporting
    • SHA-1/HMAC Authentication
    • 96 Bytes of Non-Volatile Scratch Pad FLASH
  • Battery Fuel Gauging Based on Patented Impedance Track™ Technology
    • Models 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 (5 m to 20 m)
  • HDQ and I2C™ Interface Formats for Communication with Host System
  • Small 12-pin 2,5 mm × 4 mm SON Package
  • APPLICATIONS
    • Smartphones
    • PDAs
    • Digital Still and Video Cameras
    • Handheld Terminals
    • MP3 or Multimedia Players

Impedance Track is a trademark of Texas Instruments.
I2C is a trademark of Phillips Corporation.

The Texas Instruments bq27541 Li-Ion battery fuel gauge is a microcontroller peripheral that provides fuel gauging for single-cell Li-Ion battery packs. The device requires little system microcontroller firmware development for accurate battery fuel gauging. The bq27541 resides within the battery pack or on the system’s main-board with an embedded battery (nonremovable).

The bq27541 uses the patented Impedance Track™ algorithm for fuel gauging, and provides information such as remaining battery capacity (mAh), state-of-charge (%), run-time to empty (min.), battery voltage (mV), and temperature (°C).

The bq27541 also features integrated support for secure battery pack authentication, using the SHA-1/HMAC authentication algorithm.

The Texas Instruments bq27541 Li-Ion battery fuel gauge is a microcontroller peripheral that provides fuel gauging for single-cell Li-Ion battery packs. The device requires little system microcontroller firmware development for accurate battery fuel gauging. The bq27541 resides within the battery pack or on the system’s main-board with an embedded battery (nonremovable).

The bq27541 uses the patented Impedance Track™ algorithm for fuel gauging, and provides information such as remaining battery capacity (mAh), state-of-charge (%), run-time to empty (min.), battery voltage (mV), and temperature (°C).

The bq27541 also features integrated 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 Battery Fuel Gauge for Battery Pack Integration datasheet 10 Dec 2008
Application note Gauge Communication 12 Jan 2017
Technical article Where's the Gauge? Part 1 12 Aug 2014
Application note Theory and Implementation of Impedance Track Battery Fuel-Gauging Algorithm (Rev. A) PDF | HTML 16 May 2014
Application note Using I2C Communication With the bq275xx Series of Fuel Gauges (Rev. B) 15 May 2014
Application note Selecting an Impedance Track Gas Gauge for Li-Ion Single Cell Applications 10 Apr 2012
Application note Thermistor Selection Guide for Texas Instruments Advanced Fuel Gauges 28 Sep 2011
Application note WinCE/Linux Drivers for bq275xx Fuel Gauge 17 Mar 2011
Application note Going to Production With the bq2754x (Rev. A) 11 Mar 2011
Application note Updating bq275xx Firmware at Production (Rev. A) 21 Feb 2011
Application note How to Transfer bq27541 Into Hibernate Mode 13 Apr 2010
Application note bq27541 to bq27541-v200 Change List 17 Feb 2010
Application note Configuring the bq2754x Data Flash 27 May 2009
Application note Updating Firmware with the bq2750x and EVM. (Rev. A) 22 Jul 2008
EVM User's guide bq27541EVM Single Cell Impedance Track(TM) Technology 24 Feb 2007

Design & development

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

Evaluation board

BQ27541EVM — Single Cell Impedance Track™ Battery Fuel Gauge With LDO Evaluation Module | Gas Gauge

This evaluation module (EVM) is a complete evaluation system for the bq27541. The EVM includes one bq27541 circuit module, a current sense resistor, one thermistor, an EV2300 personal computer (PC) interface board for gas gauge interface, a PC USB cable, and Windows™-based PC software. The (...)

User guide: PDF
Not available on TI.com
Design tool

GASGAUGECHEM-SW — Gas gauge chemistry updater

The chemistry updater installer contains data used by the bqEvaluation / bqEVSW / bqEASY tool for selecting the correct or closest chemical identification file for your battery pack.

The battery management studio (bqStudio) chemistry update zip file contains data used by bqStudio for selecting the (...)

Supported products & hardware

Supported products & hardware

Products
Battery fuel gauges
BQ20Z40-R1 — SBS 1.1 compliant Gas Gauge with Impedance Track™ Technology BQ20Z45-R1 — SBS 1.1 compliant Gas Gauge with Impedance Track™ Technology BQ20Z70-V160 — SBS 1.1-compliant gas gauge enabled with Impedance Track™ technology for use with the bq29330 BQ20Z75-V160 — SBS 1.1-compliant gas gauge and protection-enabled IC with Impedance Track™; BQ20Z80A-V110 — SBS 1.1 compliant gas gauge enabled with Impedance Track™; technology for use with the bq29312A BQ20Z90-V150 — SBS v1.1 compliant gas gauge for use with the bq29330 BQ20Z95 — SBS 1.1-Compliant Gas Gauge Enabled w/Impedance Track BQ27500-V120 — System-side Impedance Track™; fuel gauge with FW v1.20 BQ27500-V130 — System-side Impedance Track™; fuel gauge with FW v1.30 BQ27501 — Complete System side battery fuel gauge with Impedance Track™; technology BQ27505-J2 — System-side Impedance Track™; fuel gauge with FW v2.15 BQ27505-J3 — System-side Impedance Track™; fuel gauge with FW v2.20 BQ27505-J4 — System-side Impedance Track™; fuel gauge with FW v2.24 BQ27510-G1 — System-side Impedance-Track fuel gauge that provides 96 bytes of user-programmable data Flash memory BQ27541 — Single cell Li-ion battery fuel gauge for battery pack Integration
Hardware development
BQEVSW —

BQ evaluation software (BQEVSW) v0.0.92 for BQ30Z554-R1
Software
BQSTUDIO — Battery Management Studio (bqStudio) Software
Download options
Driver or library

USB Drivers for Windows XP and Windows 7 (32-bit OS only) (Rev. A)

SLEC003A.ZIP (1456 KB)
Download
Support software

bq27541 Senc Files v1.12

SLUC152.ZIP (46 KB)
Download
Support software

bqEVSW installer for all bq275xx devices (Rev. C)

SLUC367C.ZIP (63861 KB)
Download
Support software

bq27541-G1 (v2.24) Firmware (.senc file) (Rev. A)

SLUC368A.ZIP (47 KB)
Download
CAD/CAE symbol

Mathcad Chemistry Selection Tool (Rev. DJ)

SLUC138DJ.ZIP (6840 KB)
Download
Package Pins Download
SON (DRZ) 12 View options

Ordering & quality

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