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

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
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 NUMBER PACKAGE BODY SIZE (NOM)
bq27542-G1 SON (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