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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