The bq34z653 SBS-compliant gas gauge and protection IC, incorporatingpatented Impedance Track technology, is a single IC solution designed for battery-pack orin-system installation. The bq34z653 measures and maintains an accurate record of available chargein Li-Ion or Li-Polymer batteries using its integrated high-performance analog peripherals. Thebq34z653 monitors capacity change, battery impedance, open-circuit voltage, and other criticalparameters of the battery pack, which reports the information to the system host controller over aserial-communication bus. Together with the integrated analog front-end (AFE) short-circuit andoverload protection, the bq34z653 maximizes functionality and safety while minimizing externalcomponent count, cost, and size in smart battery circuits.

The implemented Impedance Track gas gauging technology continuously analyzes the batteryimpedance, resulting in superior gas-gauging accuracy. This enables remaining capacity to becalculated with discharge rate, temperature, and cell aging—all accounted for during each stage ofevery cycle with high accuracy.

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