SLUSBV9D March   2014  – January 2018

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
    1.     Simplified Schematic
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
    1.     Pin Functions
  6. 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  Power-On Reset
    6. 6.6  2.5-V LDO Regulator
    7. 6.7  Charger Attachment and Removal Detection
    8. 6.8  CHG and DSG FET Drive
    9. 6.9  Overvoltage Protection (OVP)
    10. 6.10 Undervoltage Protection (UVP)
    11. 6.11 Overcurrent in Discharge (OCD)
    12. 6.12 Overcurrent in Charge (OCC)
    13. 6.13 Short-Circuit in Discharge (SCD)
    14. 6.14 Low Voltage Charging
    15. 6.15 Internal Temperature Sensor Characteristics
    16. 6.16 High-Frequency Oscillator
    17. 6.17 Low-Frequency Oscillator
    18. 6.18 Integrating ADC (Coulomb Counter) Characteristics
    19. 6.19 ADC (Temperature and Cell Voltage) Characteristics
    20. 6.20 Data Flash Memory Characteristics
    21. 6.21 Timing Requirements
    22. 6.22 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Configuration
      2. 7.3.2 Fuel Gauging
      3. 7.3.3 Power Modes
        1. 7.3.3.1 NORMAL Mode
        2. 7.3.3.2 SLEEP Mode
        3. 7.3.3.3 FULLSLEEP Mode
      4. 7.3.4 Li-Ion Battery Protector Description
        1. 7.3.4.1 High-Side NFET Charge and Discharge FET Drive
        2. 7.3.4.2 Protector Configuration
    4. 7.4 Device Functional Modes
      1. 7.4.1 Operating Modes
        1. 7.4.1.1 NORMAL Mode
        2. 7.4.1.2 OVERVOLTAGE Mode
        3. 7.4.1.3 UNDERVOLTAGE Mode
        4. 7.4.1.4 OVERCURRENT IN CHARGE Mode
        5. 7.4.1.5 OVERCURRENT IN DISCHARGE and SHORT-CIRCUIT IN DISCHARGE Mode
        6. 7.4.1.6 SHUTDOWN WAIT Mode
          1. 7.4.1.6.1 ANALOG SHUTDOWN State
        7. 7.4.1.7 LOW VOLTAGE CHARGING State
      2. 7.4.2 Firmware Control of Protector
      3. 7.4.3 OVERTEMPERATURE FAULT Mode
      4. 7.4.4 Wake-Up Comparator
    5. 7.5 Battery Parameter Measurements
      1. 7.5.1 Charge and Discharge Counting
      2. 7.5.2 Voltage
      3. 7.5.3 Current
      4. 7.5.4 Auto-Calibration
      5. 7.5.5 Temperature
    6. 7.6 Communications
      1. 7.6.1 HDQ Single-Pin Serial Interface
      2. 7.6.2 I2C Interface
        1. 7.6.2.1 I2C Time Out
        2. 7.6.2.2 I2C Command Waiting Time
    7. 7.7 Standard Data Commands
      1. 7.7.1 Control(): 0x00 and 0x01
    8. 7.8 Extended Data Commands
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Applications
      1. 8.2.1 Pack-Side, Single-Cell Li-Ion Fuel Gauge and Protector
      2. 8.2.2 Design Requirements
      3. 8.2.3 Detailed Design Procedure
        1. 8.2.3.1  BAT Voltage Sense Input
        2. 8.2.3.2  SRP and SRN Current Sense Inputs
        3. 8.2.3.3  Sense Resistor Selection
        4. 8.2.3.4  TS Temperature Sense Input
        5. 8.2.3.5  Thermistor Selection
        6. 8.2.3.6  VPWR Power Supply Input Filtering
        7. 8.2.3.7  REG25 LDO Output Filtering
        8. 8.2.3.8  Communication Interface Lines
        9. 8.2.3.9  PACKP Voltage Sense Input
        10. 8.2.3.10 CHG and DSG Charge Pump Voltage Outputs
        11. 8.2.3.11 NFET Selection
        12. 8.2.3.12 Additional ESD Protection Components
      4. 8.2.4 Application Curves
  9. 9 Power Supply Recommendation
    1. 9.1 Power Supply Decoupling
  10. 10Layout
    1. 10.1 Layout Guidelines
      1. 10.1.1 Li-Ion Cell Connections
      2. 10.1.2 Sense Resistor Connections
      3. 10.1.3 Thermistor Connections
      4. 10.1.4 FET Connections
      5. 10.1.5 ESD Component Connections
      6. 10.1.6 High Current and Low Current Path Separation
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Documentation Support
      1. 11.1.1 Related Documentation
    2. 11.2 Receive Notification of Documentation Updates
    3. 11.3 Community Resources
    4. 11.4 Trademarks
    5. 11.5 Electrostatic Discharge Caution
    6. 11.6 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

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

8.2.3.1 BAT Voltage Sense Input

A ceramic capacitor at the input to the BAT pin is used to bypass AC voltage ripple to ground, greatly reducing its influence on battery voltage measurements. It proves most effective in applications with load profiles that exhibit high frequency current pulses (that is, cell phones) but is recommended for use in all applications to reduce noise on this sensitive high impedance measurement node.

The series resistor between the battery and the BAT input is used to limit current that could be conducted through the chip-scale package's solder bumps in the event of an accidental short during the board assembly process. The resistor is not likely to survive a sustained short condition (depends on power rating), however, it sacrifices the much cheaper resistor component over suffering damage to the fuel gauge die itself.