Product details


Cell chemistry Li-Ion/Li-Polymer Number of series cells 2-4 Cells, >4 Cells, Single Cell Communication interface HDQ, I2C Battery capacity (Min) (mAh) 800 Battery capacity (Max) (mAh) 320000 Implementation Pack External capacity indication LED Operating temperature range (C) -40 to 85 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


  • Supports Li-Ion and LiFePO4 Chemistries
  • Capacity Estimation Using Patented Impedance Track Technology
    for Batteries from 3 V to 65 V
    • Aging Compensation
    • Self-Discharge Compensation
  • Supports Battery Capacities Above 65 Ahr
  • Supports Charge and Discharge Currents Above 32 A
  • External NTC Thermistor Support
  • Supports Two-Wire I2C and HDQ Single-Wire Communication
    Interfaces with Host System
  • SHA-1/HMAC Authentication
  • One- or Four-LED Direct Display Control
  • Five-LED and Higher Display Through Port Expander
  • Reduced Power Modes (Typical Battery Pack Operating Range Conditions)
    • Normal Operation: < 140 µA Average
    • Sleep: < 64 µA Average
    • Full Sleep: < 19 µA Average
  • Package: 14-Pin TSSOP
open-in-new Find other Battery fuel gauges


The Texas Instruments bq34z100 is a fuel gauge solution that works independently of battery series-cell configurations, and supports a wide range of Li-Ion and LiFePO4 battery chemistries. Batteries from 3 V to 65 V can be supported through an external voltage translation circuit that can be controlled automatically to reduce system power consumption.

The bq34z100 device provides several interface options, including an I2C slave, an HDQ slave, one or four direct LEDs, and an Alert output pin. Additionally, the bq34z100 provides support for an external port expander for more than four LEDs.

open-in-new Find other Battery fuel gauges
Similar products you might be interested in
open-in-new Compare products
Exact equivalent in functionality and parametrics to the compared device:
BQ34Z100-G1 ACTIVE Multi-chemistry Impedance Track™ standalone fuel gauge | battery gas gauge This product has improved firmware.

Technical documentation

star = Top documentation for this product selected by TI
No results found. Please clear your search and try again.
View all 10
Type Title Date
* Data sheet Wide Range Fuel Gauge with Impedance Track™ Technology datasheet (Rev. B) Dec. 07, 2012
* Errata bq34z100 Errata Jan. 29, 2013
User guide bq34z100EVM Wide Range Impedance Track Enabled Battery Fuel Gauge (Rev. B) Apr. 16, 2021
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
Technical article How to choose a multicell gauge Dec. 16, 2016
Technical article What’s next for inverter power back-up systems? Jul. 04, 2014
Technical article Giving More Life to LiFePO4 Batteries Sep. 13, 2013
Application note Configuring the bq34z100 Data Flash Nov. 13, 2012
Application note Going to Production with bq34z1XX Nov. 13, 2012

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

This evaluation module (bq34z100EVM) is a complete evaluation system for the bq34z100 wide range fuel gauge for lithium ion chemistries when combined with an EV2400 USB adapter and Windows™-based PC software downloadable from the website. The circuit module includes one bq34z100 (...)

  • Complete evaluation system for the bq34z100 advanced gas gauge with Impedance Track™ technology
  • Populated circuit module for quick setup
  • Link to software allowing data logging for system analysis

Software development

SLUC366A.ZIP (54775 KB)

Design tools & simulation

SLUC138DJ.ZIP (6840 KB)

CAD/CAE symbols

Package Pins Download
TSSOP (PW) 14 View options

Ordering & quality

Information included:
  • RoHS
  • 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. ​​​​​​​​​​​​​​