SLUSCD0A August 2015  – October 2017

PRODUCTION DATA. 

  1. Features
  2. Applications
  3. Description
  4. Revision History
  5. Description (continued)
  6. Pin Configuration and Functions
  7. Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Electrical Characteristics: Supply Current
    6. 7.6 Electrical Characteristics: I/O
    7. 7.7 Electrical Characteristics: ADC
    8. 7.8 Electrical Characteristics: Power-On Reset
    9. 7.9 Electrical Characteristics: Oscillator
    10. 7.10Electrical Characteristics: Data Flash Memory
    11. 7.11Electrical Characteristics: Register Backup
    12. 7.12SMBus Timing Specifications
    13. 7.13Typical Characteristics
  8. Detailed Description
    1. 8.1Overview
    2. 8.2Functional Block Diagram
    3. 8.3Feature Description
      1. 8.3.1Primary (1st Level) Safety Features
      2. 8.3.2Secondary (2nd Level) Safety Features
      3. 8.3.3Charge Control Features
      4. 8.3.4Fuel Gauging
      5. 8.3.5Lifetime Data Logging
      6. 8.3.6Authentication
      7. 8.3.7Battery Parameter Measurements
        1. 8.3.7.1Current and Coulomb Counting
        2. 8.3.7.2Voltage
        3. 8.3.7.3Temperature
    4. 8.4Device Functional Modes
    5. 8.5Programming
      1. 8.5.1Physical Interface
      2. 8.5.2SMBus Address
      3. 8.5.3SMBus On and Off State
  9. Application and Implementation
    1. 9.1Application Information
    2. 9.2Typical Applications
      1. 9.2.1Schematic
      2. 9.2.2Design Requirements
      3. 9.2.3Detailed Design Procedure
        1. 9.2.3.1Measurement System
          1. 9.2.3.1.1Cell Voltages
          2. 9.2.3.1.2External Average Cell Voltage
          3. 9.2.3.1.3Current
          4. 9.2.3.1.4Temperature
        2. 9.2.3.2Gas Gauging
        3. 9.2.3.3Charging
          1. 9.2.3.3.1Fast Charging Voltage
          2. 9.2.3.3.2Fast Charging Current
          3. 9.2.3.3.3Other Charging Modes
        4. 9.2.3.4Protection
        5. 9.2.3.5Peripheral Features
          1. 9.2.3.5.1LED Display
          2. 9.2.3.5.2SMBus Address
      4. 9.2.4Application Performance Plots
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1Layout Guidelines
      1. 11.1.1Power Supply Decoupling Capacitor
      2. 11.1.2MRST Connection
      3. 11.1.3Communication Line Protection Components
      4. 11.1.4ESD Spark Gap
    2. 11.2Layout Example
  12. 12Device and Documentation Support
    1. 12.1Related Documentation
    2. 12.2Community Resources
    3. 12.3Trademarks
    4. 12.4Electrostatic Discharge Caution
    5. 12.5Glossary
  13. 13Mechanical, Packaging, and Orderable Information

Features

  • Compensated End-of-Discharge Voltage (CEDV) Gauging Algorithm
  • Supports SMBus Host Communication
  • Flexible Configuration for 3- to 5-Series (bq76920), 6- to 10-Series (bq76930), and 9- to 15-Series (bq76940) Li-Ion and LiFePO4 Batteries
  • Supports Battery Configurations up to 320 Ahr
  • Supports Charge and Discharge Current Reporting up to 320 A
  • On-Chip Temperature Sensor Option
  • External NTC Thermistor Support from Companion AFE
  • Full Array of Programmable Protection Features
    • Voltage, Current, and Temperature
    • System Components
  • Lifetime Data Logging
  • Supports CC-CV Charging, Including Precharge, Charge Inhibit, and Charge Suspend
  • Offers an Optional Resistor Programmable SMBus Slave Address for up to Eight Different Bus Addresses
  • Drives up to a 5-Segment LED or LCD Display for State-Of-Charge Indication
  • Provides SHA-1 Authentication

Applications

  • Light Electric Vehicles (LEVs): eBikes, eScooters, Pedelec, and Pedal-Assist Bicycles
  • Power and Gardening Tools
  • Battery Backup and Uninterruptible Power Supply (UPS) Systems
  • Wireless Base Station Backup Systems
  • Telecom Power Systems
  • Handheld Vacuum Cleaners and Robot Vacuums

Description

The Texas Instruments bq78350-R1 Li-Ion and LiFePO4 Battery Management Controller and companion to the bq769x0 family of Analog Front End (AFE) protection devices provides a comprehensive set of Battery Management System (BMS) subsystems, helping to accelerate product development for faster time-to-market.

The bq78350-R1 controller and the bq769x0 AFE support 3-series to 15-series cell applications. The bq78350-R1 device provides an accurate fuel gauge and state-of-health (SoH) monitor, as well as cell balancing and a full range of voltage-, current-, and temperature-based protection features.

Device Information(1)

PART NUMBER PACKAGEBODY SIZE (NOM)
bq78350-R1TSSOP (30)7.80 mm x 6.40 mm
  1. For all available packages, see the orderable addendum at the end of the data sheet.

Simplified Schematic

bq78350-R1 SimpSchematic.gif