The bq34z653 SBS-compliant gas gauge and protection IC, incorporating
patented Impedance Track™ technology, is a single IC solution designed for battery-pack or
in-system installation. The bq34z653 measures and maintains an accurate record of available charge
in Li-Ion or Li-Polymer batteries using its integrated high-performance analog peripherals. The
bq34z653 monitors capacity change, battery impedance, open-circuit voltage, and other critical
parameters of the battery pack, which reports the information to the system host controller over a
serial-communication bus. Together with the integrated analog front-end (AFE) short-circuit and
overload protection, the bq34z653 maximizes functionality and safety while minimizing external
component count, cost, and size in smart battery circuits.
The implemented Impedance Track gas gauging technology continuously analyzes the battery
impedance, resulting in superior gas-gauging accuracy. This enables remaining capacity to be
calculated with discharge rate, temperature, and cell aging—all accounted for during each stage of
every cycle with high accuracy.
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