Lead-acid fuel gauge with Impedance Track
The Texas Instruments BQ34Z110PW is a battery monitor IC purpose-built for lead-acid chemistries, running the Impedance Track™ fuel-gauging algorithm. It communicates over HDQ or I²C to a host controller, reporting state-of-charge, voltage, and remaining capacity. The 14-TSSOP package keeps the footprint small for embedded battery-management boards in UPS systems, backup power units, and industrial equipment where lead-acid is the incumbent chemistry.
What the ratings mean for the BOM
The Impedance Track algorithm compensates for discharge rate, temperature, and cell aging — the accuracy a calibration technician expects from a fuel gauge that tracks impedance changes over the battery's life, not just voltage lookup. The -40°C to 85°C operating range covers outdoor telecom enclosures and unheated factory floors; the part does not require a heated enclosure for winter operation. The HDQ and I²C interface options give the firmware engineer flexibility: HDQ uses a single-wire bus for minimal pin count, I²C for standard multi-device bus integration. The 14-TSSOP package is a 4.40 mm wide body, common for this pin count, and the surface-mount footprint suits automated assembly lines.
Lifecycle and sourcing
It is ROHS3 compliant.