Product details


Cell chemistry Lead Acid Number of series cells >4 Cells Communication interface HDQ, I2C Battery capacity (Min) (mAh) 800 Battery capacity (Max) (mAh) 320000 Implementation Pack External capacity indication LED Features Impedance Track™ algorithm 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


  • Supports Lead-Acid Chemistries
  • Capacity Estimation Using Patented Impedance
    Track Technology for Batteries from 4 V to 64 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 bq34z110 is a fuel gauge solution that works independently of battery series-cell configurations, and supports Lead-Acid battery chemistries. Batteries from 4 V to 64 V can be supported through an external voltage translation circuit that can be controlled automatically to reduce system power consumption.

The bq34z110 device provides several interface options, including an I2C slave, an HDQ slave, one or four direct LEDs, and an Alert output pin. Additionally, the bq34z110 provides support for an external port expander for more than four LEDs.

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Technical documentation

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Type Title Date
* Data sheet bq34z110 Wide Range Fuel Gauge with Impedance Track™ for Lead Acid Batteries datasheet (Rev. B) May 02, 2013
Technical article What’s next for inverter power back-up systems? Jul. 04, 2014
Application note Lead Acid battery monitoring for Power Back-Up Inverters using bq34z110 Apr. 18, 2014
Application note Configuring the bq34z100 Data Flash Nov. 13, 2012
Application note Going to Production with bq34z1XX Nov. 13, 2012
User guide bq34z110EVM Impedance Track Enabled Fuel Gauge for Lead Acid Batteries Sep. 21, 2012
Application note Using the bq24650 to Charge a Sealed, Lead-Acid Battery (Rev. A) Oct. 04, 2011

Design & development

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Software development

SLUC407.ZIP (45181 KB)

CAD/CAE symbols

Package Pins Download
TSSOP (PW) 14 View options

Ordering & quality

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  • MSL rating/Peak reflow
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  • Qualification summary
  • Ongoing reliability monitoring

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