BQ20Z655-R1 SBS 1.1 Compliant Gas Gauge with LED/LCD Drive feature and Impedance Track™ Technology |

BQ20Z655-R1 (ACTIVE) SBS 1.1 Compliant Gas Gauge with LED/LCD Drive feature and Impedance Track™ Technology



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.


  • Next Generation Patented Impedance Track™
    Technology Accurately Measures Available
    Charge in Li-Ion and Li-Polymer Batteries
    • Better Than 1% Error Over the Lifetime of the
  • Supports Smart Battery Specification SBS V1.1
  • Flexible Configuration for 2-Series to 4-Series Li-
    Ion and Li-Polymer Cells
  • Powerful 8-Bit RISC CPU with Ultralow Power
  • Full Array of Programmable Protection Features
    • Voltage, Current, and Temperature
  • Satisfies JEITA Guidelines
  • Added Flexibility to Handle More Complex
    Charging Profiles
  • Lifetime Data Logging
  • Drives 3, 4, or 5 Segment Liquid Crystal Display
    and LED for Battery-Pack Conditions
  • Supports SHA-1 Authentication
  • Complete Battery Protection and Gas Gauge
    Solution in One Package


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Part number Order Number of series cells Cell chemistry Battery capacity (Max) (mAh) Communication interface Battery capacity (Min) (mAh) External capacity indication Implementation Gas gauge algorithm Cell balancing Features Operating temperature range (C) Package Group Package size: mm2:W x L (PKG)
BQ20Z655-R1 Order now 2-4 Cells     Li-Ion/Li-Polymer     32000     SMBus     800     LED
Pack     Impedance Track     Internal     Integrated Protector
SHA-1 Authentication    
-40 to 85     TSSOP | 44     44TSSOP: 71 mm2: 6.4 x 11.15 (TSSOP | 44)