The bq20z655-R1 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 bq20z655-R1 measures and maintains an accurate record of available charge in
Li-ion or Li-polymer batteries using its integrated high-performance analog peripherals. The
bq20z655-R1 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 bq20z655-R1 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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