BQ34Z110 Wide range fuel gauge with Impedance Track™; for lead acid batteries | battery gas gauge |

This product has been released to the market and is available for purchase. For some products, newer alternatives may be available.
Wide range fuel gauge with Impedance Track™; for lead acid batteries | battery gas gauge


Recommended alternative parts

  • BQ34Z100-G1  - The device has the SAME FUNCTIONALITY and PINOUT as the compared device but is NOT an exact equivalent.   This product has improved firmware.


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.


  • 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


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Part number Order Cell chemistry Battery capacity (Max) (mAh) Communication interface Battery capacity (Min) (mAh) External capacity indication Implementation Gas gauge algorithm Operating temperature range (C) Package Group Package size: mm2:W x L (PKG)
BQ34Z110 Order now Lead Acid     320000     HDQ
800     LED     Pack     IT (High accuracy)     -40 to 85     TSSOP | 14     14TSSOP: 32 mm2: 6.4 x 5 (TSSOP | 14)