SLUSAN9A August   2011  – August 2015

PRODUCTION DATA.  

  1. Features
  2. Applications
  3. Description
  4. Revision History
  5. Pin Configuration and Functions
  6. Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Power-on Reset
    7. 6.7 Data Flash Characteristics Over Recommended Operating Temperature and Supply Voltage
    8. 6.8 SMBus Timing Requirements
    9. 6.9 Typical Characteristics
  7. Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Feature Set
        1. 7.3.1.1 Primary (1st Level) Safety Features
        2. 7.3.1.2 Secondary (2nd Level) Safety Features
        3. 7.3.1.3 Charge Control Features
        4. 7.3.1.4 Gas Gauging
        5. 7.3.1.5 Lifetime Data Logging Features
        6. 7.3.1.6 Authentication
      2. 7.3.2 Battery Parameter Measurements
        1. 7.3.2.1 Charge and Discharge Counting
        2. 7.3.2.2 Voltage
        3. 7.3.2.3 Current
        4. 7.3.2.4 Wake Function
        5. 7.3.2.5 Auto Calibration
        6. 7.3.2.6 Temperature
    4. 7.4 Device Functional Modes
      1. 7.4.1 Power Modes
    5. 7.5 Programming
      1. 7.5.1 Configuration
        1. 7.5.1.1 Oscillator Function
        2. 7.5.1.2 System Present Operation
      2. 7.5.2 Communications
        1. 7.5.2.1 SMBus On and Off State
      3. 7.5.3 SBS Commands
  8. Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1 Choosing the Correct Chemistry
        2. 8.2.2.2 High-Current Path
        3. 8.2.2.3 Protection FETs
        4. 8.2.2.4 Lithium-Ion Cell Connections
        5. 8.2.2.5 Sense Resistor
        6. 8.2.2.6 ESD Mitigation
        7. 8.2.2.7 System Present
        8. 8.2.2.8 SMBus Communication
      3. 8.2.3 Application Curves
  9. Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
      1. 10.1.1 Protector FET Bypass and Pack Terminal Bypass Capacitors
      2. 10.1.2 ESD Spark Gap
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Documentation Support
      1. 11.1.1 Related Documentation
    2. 11.2 Community Resources
    3. 11.3 Trademarks
    4. 11.4 Electrostatic Discharge Caution
    5. 11.5 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

Features

  • 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 Battery
  • 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 Modes
  • 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

Applications

  • Medical and Test Equipment
  • Portable Instrumentation and Industrial Equipment
  • Rechargeable Battery Packs

Description

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.

Device Information(1)

PART NUMBER PACKAGE BODY SIZE (NOM)
bq20z655-R1 DBT (44) 4.40 mm × 11.29 mm
  1. For all available packages, see the orderable addendum at the end of the data sheet.

System Partitioning Diagram

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