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 balancing
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 balancing
VSON (DRZ) 12 10 mm² 4 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.

Download

Technical documentation

star = Top documentation for this product selected by TI
No results found. Please clear your search and try again.
View all 24
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 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 How to Generate Golden Image for Single-Cell Impedance Track(TM) Devices 07 Jan 2010
Application note Configuring the bq2754x Data Flash 27 May 2009
Analog design journal Improving Battery Safety, Charging, and Fuel Gauging in Portable Media Apps 11 Mar 2009
Application note Single Cell Gas Gauge Application Book 28 Jul 2008
Application note Updating Firmware with the bq2750x and EVM. (Rev. A) 22 Jul 2008
Application note Impedance Track Fuel Gauge Accuracy Test for GSM Phone Applications 21 Mar 2008
Application note ESD and RF Mitigation in Handheld Battery Pack Electronics 06 Mar 2008
Application note Single Cell Gas Gauge Circuit Design 22 Feb 2008
Application note Single Cell Impedance Track Printed-Circuit Board Layout 22 Feb 2008
Application note Theory and Implementation of Impedance Track Battery Fuel-Gauging Algorithm 31 Jan 2008
Analog design journal Host-Side Gas-Gauge-System Design Considerations for Single-Cell Handheld Apps 12 Oct 2007
White paper Impedance Track Based Fuel Gauging 27 Sep 2007
User 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 (...)

In stock
Limit: 3
Driver or library

BQ27XXXSW-LINUX — Linux Driver for BQ27XXX

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

(...)

Support software

bq27541 Senc Files v1.12

SLUC152.ZIP (46 KB)
Support software

bqEVSW installer for all bq275xx devices (Rev. C)

SLUC367C.ZIP (63861 KB)
Support software

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

SLUC368A.ZIP (47 KB)
Design tool

GASGAUGECHEM-SW — Gas Gauge Chemistry Updater

The Chemistry Updater installer contains data used by the bq Evaluation/ 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 (...)
CAD/CAE symbol

Mathcad Chemistry Selection Tool (Rev. DJ)

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

Ordering & quality

Information included:
  • RoHS
  • REACH
  • Device marking
  • Lead finish/Ball material
  • MSL rating/Peak reflow
  • MTBF/FIT estimates
  • Material content
  • Qualification summary
  • Ongoing reliability monitoring

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

Support & training

TI E2E™ forums with technical support from TI engineers

Content is provided "as is" by TI and community contributors and does not constitute TI specifications. See terms of use.

If you have questions about quality, packaging or ordering TI products, see TI support. ​​​​​​​​​​​​​​

Videos