SLUSC33 April 2015

PRODUCTION DATA. 

  1. Features
  2. Applications
  3. Description
  4. Simplified Schematic
  5. Revision History
  6. Device Comparison Table
  7. Pin Configurations and Functions
  8. Specifications
    1. 8.1 Absolute Maximum Ratings
    2. 8.2 ESD Ratings
    3. 8.3 Recommended Operating Conditions
    4. 8.4 Thermal Information
    5. 8.5 Electrical Characteristics: Power-On Reset
    6. 8.6 2.5-V LDO Regulator
    7. 8.7 Internal Temperature Sensor Characteristics
    8. 8.8 Internal Clock Oscillators
    9. 8.9 Integrating ADC (Coulomb Counter) Characteristics
    10. 8.10ADC (Temperature and Cell Voltage) Characteristics
    11. 8.11Data Flash Memory Characteristics
    12. 8.12Timing Requirements
    13. 8.13Timing Requirements: HDQ Communication
    14. 8.14Timing Requirements: I2C-Compatible Interface
    15. 8.15Typical Characteristics
  9. Detailed Description
    1. 9.1Overview
    2. 9.2Functional Block Diagram
    3. 9.3Feature Description
      1. 9.3.1Fuel Gauging
      2. 9.3.2Impedance Track Variables
      3. 9.3.3System Control Function
        1. 9.3.3.1SHUTDOWN Mode
        2. 9.3.3.2INTERRUPT Mode
    4. 9.4Device Functional Modes
      1. 9.4.1NORMAL Mode
      2. 9.4.2SLEEP Mode
      3. 9.4.3FULLSLEEP Mode
      4. 9.4.4HIBERNATE Mode
    5. 9.5Programming
      1. 9.5.1Standard Data Commands
        1. 9.5.1.1Control(): 0x00 and 0x01
    6. 9.6Power Control
      1. 9.6.1Reset Functions
      2. 9.6.2Wake-Up Comparator
      3. 9.6.3Flash Updates
    7. 9.7Autocalibration
    8. 9.8Communications
      1. 9.8.1HDQ Single-Pin Serial Interface
      2. 9.8.2HDQ Host Interruption Feature
        1. 9.8.2.1Low Battery Capacity
        2. 9.8.2.2Temperature
      3. 9.8.3I2C Interface
        1. 9.8.3.1I2C Time Out
        2. 9.8.3.2I2C Command Waiting Time
        3. 9.8.3.3I2C Clock Stretching
  10. 10Application and Implementation
    1. 10.1Application Information
    2. 10.2Typical Application
      1. 10.2.1Design Requirements
      2. 10.2.2Detailed Design Procedure
        1. 10.2.2.1BAT Voltage Sense Input
        2. 10.2.2.2SRP and SRN Current Sense Inputs
        3. 10.2.2.3Sense Resistor Selection
        4. 10.2.2.4TS Temperature Sense Input
        5. 10.2.2.5Thermistor Selection
        6. 10.2.2.6REGIN Power Supply Input Filtering
        7. 10.2.2.7REG25 LDO Output Filtering
        8. 10.2.2.8Communication Interface Lines
        9. 10.2.2.9PACKP Voltage Sense Input
    3. 10.3Application Curves
  11. 11Power Supply Recommendations
  12. 12Layout
    1. 12.1Layout Guidelines
      1. 12.1.1Lithium-Ion Cell Connections
      2. 12.1.2Sense Resistor Connections
      3. 12.1.3Thermistor Connections
      4. 12.1.4High Current and Low Current Path Separation
    2. 12.2Layout Example
  13. 13Device and Documentation Support
    1. 13.1Documentation Support
      1. 13.1.1Related Documentation
    2. 13.2Community Resources
    3. 13.3Trademarks
    4. 13.4Electrostatic Discharge Caution
    5. 13.5Glossary
  14. 14Mechanical, Packaging, and Orderable Information

1 Features

  • Battery Fuel Gauge for 1-Series (1sXp) Li-Ion Applications up to 14,500-mAh Capacity
  • Microcontroller Peripheral Provides:
    • Accurate Battery Fuel Gauging Supports up to 14,500 mAh
    • Internal or External Temperature Sensor for Battery Temperature Reporting
    • SHA-1/HMAC Authentication
    • Lifetime Data Logging
    • 64 Bytes of Non-Volatile Scratch Pad FLASH
  • Battery Fuel Gauging Based on Patented Impedance Track™ Technology
    • Models Battery Discharge Curve for Accurate Time-To-Empty Predictions
    • Automatically Adjusts for Battery Aging, Battery Self-Discharge, and Temperature/Rate Inefficiencies
    • Low-Value Sense Resistor (5 mΩ to 20 mΩ)
  • Advanced Fuel Gauging Features
    • Internal Short Detection
    • Tab Disconnection Detection
  • HDQ and I2C Interface Formats for Communication with Host System
  • Small 12-pin 2.50 mm × 4.00 mm SON Package
  • Complies with Battery Trip Point (BTP) Requirements

2 Applications

  • Smartphones
  • Tablets
  • Digital Still and Video Cameras
  • Handheld Terminals
  • MP3 or Multimedia Players

3 Description

The Texas Instruments bq27542-G1 Li-Ion battery fuel gauge is a microcontroller peripheral that provides fuel gauging for single-cell Li-Ion battery packs. The device requires little system microcontroller firmware development for accurate battery fuel gauging. The fuel gauge resides within the battery pack or on the main board of the system with an embedded battery (non-removable).

The fuel gauge uses the patented Impedance Track™ algorithm for fuel gauging, and provides information such as remaining battery capacity (mAh), state-of-charge (%), run-time to empty (minimum), battery voltage (mV), and temperature (°C). It also provides detections for internal short or tab disconnection events.

The fuel gauge also features integrated support for secure battery pack authentication, using theSHA-1/HMAC authentication algorithm.

Device Information(1)

PART NUMBERPACKAGEBODY SIZE (NOM)
bq27542-G1SON (12)2.50 mm x 4.00 mm
(1) For all available packages, see the orderable addendum at the end of the data sheet.

4 Simplified Schematic

bq27542-G1 SimpSchematic.gif