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http://www.ti.com/general/docs/suppproductinfo.tsp?distId=26&gotoUrl=https%3A%2F%2Fwww.ti.com%2Flit%2Fgpn%2Fbq28z620″>View Datasheet

Texas Instruments bq28Z620 Battery Fuel Gauge

Texas Instruments bq28Z620 Battery Fuel Gauge is a highly integrated, accurate, 1-series to 2-series cell gas gauge and protection solution, enabling autonomous charger control and cell balancing. The bq28Z620 device enables autonomous charge control through Master Mode I2C broadcasts of charging current and voltage information, eliminating software overhead typically incurred by the system’s host controller. The bq28Z620 device provides a fully integrated pack-based solution with a flash programmable custom reduced instruction-set CPU (RISC), safety protection, and authentication for 1- to 2-series cell Li-ion and Li-polymer battery packs.

The Texas Instruments bq28Z620 gas gauge communicates via an I2C compatible interface and combines an ultra-low-power, high-speed TI BQBMP processor and high-accuracy analog measurement capabilities. The device also includes integrated flash memory, an array of peripheral and communication ports, an N-CH FET drive, and an SHA-1 authentication transform responder into a complete, high-performance battery management solution.

Features

  • Autonomous battery charging control, using a dedicated MASTER mode I2C interface
  • 400kHz I2C bus communications interface, including a 1.2V logic level for high-speed programming and data access
  • Cell balancing with an internal bypass to optimize battery health
  • A high-side protection N-CH FET drive enables serial bus communication during fault conditions
  • Programmable protection levels for voltage, current, and temperature
  • Analog front-end with two independent ADCs
    • Support for simultaneous current and voltage sampling
    • High-accuracy coulomb counter with input offset error < 1µV (typical)
  • Supports down to 0.5mΩ current sense resistor while capable of 1mA current measurement
  • SHA-1 authentication responder for increased battery pack security
  • Compact 12-pin VSON package (DRZ)

Features

  • Tablet computing
  • Portable and wearable health devices
  • Portable audio devices
    • Wireless (BLUETOOTH®) speakers

Simplified Schematic

Schematic - Texas Instruments bq28Z620 Battery Fuel Gauge

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Texas Instruments bq28Z620 Battery Fuel Gauge