1FEATURES
23• 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

APPLICATIONS
• Light Electric Vehicles
• Power Tools
• Medical Instrumentation
• Uninterruptible Power Supplies (UPS)
• Mobile Radios

DESCRIPTION
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.