Product details


Cell chemistry Primary Lithium Number of series cells Single Cell Communication interface I2C Battery capacity (Min) (mAh) 100 Battery capacity (Max) (mAh) 32000 Implementation Pack, System External capacity indication None Features Accumulated Coulomb Count, End of Service Operating temperature range (C) -40 to 85 Cell balancing open-in-new Find other Battery fuel gauges

Package | Pins | Size

TSSOP (PW) 14 32 mm² 5 x 6.4 open-in-new Find other Battery fuel gauges


  • Fuel gauge and battery diagnostics for flow meter applications predict end-of-service or early battery failure
    • Supports lithium thionyl chloride (Li-SOCl2) and lithium manganese dioxide (Li-MnO2) chemistry batteries
    • Accurate voltage, temperature, current, and coulomb counter measurements that report battery health and service life
    • State-of-health (SOH) algorithm for Li-MnO2
    • End-of-service (EOS algorithm for Li-SOCl2)
    • Coulomb accumulation (ACC) algorithm for all battery types
  • Ultra-low average power consumption to maximize battery run time
    • Gauge enabled through host-controlled periodic updates
    • State-of-health (SOH) ~0.06 µA
    • End-of-service (EOS) ~0.35 µA
    • Coulomb accumulation (ACC) diagnostic updates ~0.3 µA
  • System interaction capabilities
    • I2C host communication, providing battery parameter and status access
    • Configurable host interrupt
    • Battery information data logging options for in operation diagnostics and failure analysis
    • SHA-1 authentication to help prevent counterfeit battery use
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The BQ35100 Battery Fuel Gauge and End-Of-Service Monitor provides highly configurable fuel gauging for non-rechargeable (primary) lithium batteries without requiring a forced discharge of the battery. Built so that optimization is not necessary to achieve accurate gauging, the BQ35100 device uses patented TI gauging algorithms to support the option to seamlessly replace an old battery with a new one.

The BQ35100 device provides accurate results with ultra-low average power consumption where less than 2 µA can be achieved through host control via the GAUGE ENABLE (GE) pin. The device is only required to be powered long enough, at a system-determined update frequency, to gather data and to make calculations to support the selected algorithm. A typical system may need to only be updated once every 8 hours as the gauge is not required to be powered to measure all discharge activity.

The fuel gauging functions use voltage, current, and temperature measurements to provide state-of-health (SOH) data and end-of-service (EOS) warning information where the host can read the gathered data through a 400-kHz I2C bus. An ALERT output, based on a variety of configurable status and data options, is also available to interrupt the host.

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Technical documentation

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Type Title Date
* Data sheet BQ35100 Lithium Primary Battery Fuel Gauge and End-Of-Service Monitor datasheet (Rev. E) Apr. 08, 2019
* User guide bq35100 Technical Reference Manual (Rev. C) Mar. 26, 2018
User guide BQ78350-R1A Technical Reference Manual Dec. 09, 2019
Application note Alternative Gauging Techniques for Flow Meters and the Benefits of the bq35100 Nov. 15, 2018
Technical article Facing smart meter design challenges, part 1: maximizing battery life Aug. 16, 2018
Application note Using the BQ35100 with Li-Primary Based Applications Jun. 20, 2018
Application note Gauge Communication Jan. 12, 2017
Technical article How do you detect battery aging in rarely discharged applications? Jan. 10, 2017
Technical article How to choose a multicell gauge Dec. 16, 2016
Application note Using I2C Communications With the bq34110 bq35100 and bq34z100-G1 Series of Gas Nov. 09, 2016
User guide bq35100EVM-795 Evaluation Module User’s Guide Jul. 12, 2016

Design & development

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

Hardware development

document-generic User guide
BQ35100EVM-795 is a complete system useful for evaluating the functionality of the bq35100 fuel gauging and End-of-Service monitoring algorithms. As described on the BQ35100 product folder, this gauge is appropriate for applications powered by one cell to multicell lithium primary (nonrechargeable (...)
  • Complete evaluation system for the bq35100 gas gauge with EOS monitoring
  • Populated circuit module for quick setup
  • Complete evaluation system for the bq35100 battery management IC

Software development

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 (...)
  • 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 
SLUC623.ZIP (4162 KB)

Reference designs

Battery and System Health Monitoring of Battery Powered Smart Flow Meters Reference Design
TIDA-01546 — This reference design showcases innovative solutions for battery and system health monitoring of battery-powered Smart Flow Meters.  The battery monitoring subsystem provides highly accurate energy measurement and State of Health(SOH) projections which forecast battery lifetime. The system (...)
document-generic Schematic document-generic User guide
Reference Design to Extend Coin Cell Battery Run Time in Wireless Ultrasonic Gas Leak Detector
TIDA-01236 This reference design demonstrates a low-power wireless sensor which detects gas leaks by analyzing the ultrasonic spectrum for particular signatures. The system is designed to operate from a single Li-Primary coin cell and communicate wirelessly to a base station, which removes all requirements for (...)
document-generic Schematic document-generic User guide

CAD/CAE symbols

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