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  • bq27425-G2 System-Side Impedance Track Fuel Gauge With Integrated Sense Resistor

    • SLUSB23B October   2012  – June 2015 BQ27425-G2A , BQ27425-G2B

      PRODUCTION DATA.  

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  • bq27425-G2 System-Side Impedance Track Fuel Gauge With Integrated Sense Resistor
  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Device Comparison Table
  6. 6 Pin Configuration and Functions
  7. 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: Power-On Reset
    6. 7.6  2.5-V LDO Regulator
    7. 7.7  Integrating ADC (Coulomb Counter) Characteristics
    8. 7.8  Integrated Sense Resistor Characteristics
    9. 7.9  ADC (Temperature and Cell Measurement) Characteristics
    10. 7.10 EEPROM Memory Characteristics
    11. 7.11 Timing Requirements: I2C-Compatible Interface Communication
    12. 7.12 Typical Characteristics
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Fuel Gauging
      2. 8.3.2 Fuel Gauging Configurations
        1. 8.3.2.1 SOC Smoothing Feature
      3. 8.3.3 GPOUT Pin
      4. 8.3.4 Battery Detection (BIN)
    4. 8.4 Device Functional Modes
      1. 8.4.1 Operating Modes
        1. 8.4.1.1 POR and INITIALIZATION Modes
        2. 8.4.1.2 CONFIG UPDATE Mode
        3. 8.4.1.3 NORMAL Mode
        4. 8.4.1.4 SLEEP Mode
        5. 8.4.1.5 HIBERNATE Mode
    5. 8.5 Programming
      1. 8.5.1 Standard Data Commands
        1. 8.5.1.1  Control(): 0x00 and 0x01
          1. 8.5.1.1.1  CONTROL_STATUS: 0x0000
          2. 8.5.1.1.2  DEVICE_TYPE: 0x0001
          3. 8.5.1.1.3  FW_VERSION: 0x0002
          4. 8.5.1.1.4  PREV_MACWRITE: 0x0007
          5. 8.5.1.1.5  CHEM_ID: 0x0008
          6. 8.5.1.1.6  BAT_INSERT: 0X000C
          7. 8.5.1.1.7  BAT_REMOVE: 0X000D
          8. 8.5.1.1.8  SET_HIBERNATE: 0x0011
          9. 8.5.1.1.9  CLEAR_HIBERNATE: 0x0012
          10. 8.5.1.1.10 SET_CFGUPDATE: 0x0013
          11. 8.5.1.1.11 SEALED: 0x0020
          12. 8.5.1.1.12 RESET: 0x0041
          13. 8.5.1.1.13 SOFT_RESET: 0x0042
        2. 8.5.1.2  Temperature( ): 0x02 and 0x03
        3. 8.5.1.3  Voltage( ): 0x04 and 0x05
        4. 8.5.1.4  Flags( ): 0x06 and 0x07
        5. 8.5.1.5  NominalAvailableCapacity( ): 0x08 and 0x09
        6. 8.5.1.6  FullAvailableCapacity( ): 0x0A and 0x0B
        7. 8.5.1.7  RemainingCapacity( ): 0x0C and 0x0D
        8. 8.5.1.8  FullChargeCapacity( ): 0x0E and 0x0F
        9. 8.5.1.9  AverageCurrent( ): 0x10 and 0x11
        10. 8.5.1.10 AveragePower( ): 0x18 and 0x19
        11. 8.5.1.11 StateOfCharge( ): 0x1C and 0x1D
        12. 8.5.1.12 IntTemperature( ): 0x1E and 0x1F
        13. 8.5.1.13 StateOfHealth( ): 0x20 and 0x21
        14. 8.5.1.14 OperationConfiguration( ): 0x3A and 0x3B
        15. 8.5.1.15 DesignCapacity( ): 0x3C and 0x3D
        16. 8.5.1.16 DebugX( ):
      2. 8.5.2 Extended Data Commands
        1. 8.5.2.1 OperationConfiguration( ): 0x3A and 0x3B
        2. 8.5.2.2 DesignCapacity( ): 0x3C and 0x3D
        3. 8.5.2.3 DataClass( ): 0x3E
        4. 8.5.2.4 DataBlock( ): 0x3F
        5. 8.5.2.5 BlockData( ): 0x40 through 0x5F
        6. 8.5.2.6 BlockDataChecksum( ): 0x60
        7. 8.5.2.7 BlockDataControl( ): 0x61
        8. 8.5.2.8 Reserved: 0x62 through 0x7F
      3. 8.5.3 Block Data Interface
        1. 8.5.3.1 Accessing Block Data
      4. 8.5.4 Access Modes
        1. 8.5.4.1 Sealing and Unsealing Data Blocks
      5. 8.5.5 Data Block Summary
      6. 8.5.6 Detecting Charge Termination
      7. 8.5.7 Communications
        1. 8.5.7.1 I2C Interface
        2. 8.5.7.2 I2C Time Out
        3. 8.5.7.3 I2C Command Waiting Time
        4. 8.5.7.4 I2C Clock Stretching
    6. 8.6 Register Maps
      1. 8.6.1 Operation Configuration (Op Config) Register
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
        1. 9.2.2.1 BAT/REGIN Voltage Sense Input
        2. 9.2.2.2 Integrated LDO Capacitor
      3. 9.2.3 Application Curves
  10. 10Power Supply Recommendations
    1. 10.1 Power Supply Decoupling
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Community Resources
    2. 12.2 Trademarks
    3. 12.3 Electrostatic Discharge Caution
    4. 12.4 Glossary
  13. 13Mechanical, Packaging, and Orderable Information
    1. 13.1 Packaging
      1. 13.1.1 Package Dimensions
  14. IMPORTANT NOTICE
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DATA SHEET

bq27425-G2 System-Side Impedance Track Fuel Gauge With Integrated Sense Resistor

1 Features

  • Single-Series Cell Li-Ion Battery Fuel Gauge
    • Resides on System Board
    • Supports Embedded or Removable Batteries
    • Powered Directly From Battery With Integrated LDO
    • Low-Value Integrated Sense Resistor
      (10 mΩ, Typical)
  • Easy-to-Configure Fuel Gauging Based on Patented Impedance Track™ Technology
    • Reports Remaining Capacity and State of Charge (SOC) With Smoothing Filter
    • Automatically Adjusts for Battery Aging, Self-Discharge, Temperature, and Rate Changes
    • Battery State-of-Health (Aging) Estimation
  • Microcontroller Peripheral Supports:
    • 400-kHz I2C Serial Interface
    • Configurable SOC Interrupt or
      Battery Low Digital Output Warning
    • Internal Temperature Sensor or
      Host-Reported Temperature

2 Applications

  • Smart Phones, Feature Phones, and Tablets
  • Digital Still and Video Cameras
  • Handheld Terminals
  • MP3 or Multimedia Players

3 Description

The Texas Instruments bq27425-G2 fuel gauge is an easy-to-configure microcontroller peripheral that provides system-side fuel gauging for single-cell Li-Ion batteries. The device requires minimal user configuration and system microcontroller firmware development.

The fuel gauge uses the patented Impedance Track™ algorithm for fuel gauging, and provides information such as remaining battery capacity (mAh), state-of-charge (%), and battery voltage (mV).

Battery fuel gauging with the bq27425-G2 fuel gauge requires connections only to PACK+ (P+) and PACK– (P–) for a removable battery pack or embedded battery circuit. The 15-pin, 2.69 mm × 1.75 mm, 0.5-mm pitch chip scale package (DSBGA) is ideal for space-constrained applications.

Device Information(1)

DEVICE NAME PACKAGE BODY SIZE (NOM)
bq27425-G2 DSBGA (15) 2.69 mm × 1.75 mm
(1) For all available packages, see the orderable addendum at the end of the data sheet.

Simplified Schematic

bq27425-G2 typ_app_lusai6.gif

4 Revision History

Changes from A Revision (February 2013) to B Revision

  • Added ESD Ratings table, Feature Description section, Device Functional Modes, Application and Implementation section, Power Supply Recommendations section, Layout section, Device and Documentation Support section, and Mechanical, Packaging, and Orderable Information sectionGo

Changes from * Revision (October 2012) to A Revision

  • AVAILABLE OPTIONS table: Replaced "Contact Factory" with orderable quantities for bq27425YZFR-G2A and bq27425YZFT-G2BGo
  • AVAILABLE OPTIONS table: Added CHEM_ID columnGo
  • Recommended Operating Conditions: Added SHUTDOWN mode specificationsGo
  • OPERATING MODES: Added text "In SHUTDOWN mode, ...."Go
  • Changed Figure 6, POWER MODE DIAGRAM. Added OFF and SHUTDOWN modes to diagram.Go
  • Changed the CHEM_ID subcommand section: (CHEM_ID: 0x0008)Go
  • Data Block Summary: Updated Default Value column to show -G2B version differences in (Green Text)Go
  • Data Block Summary: Changed Units value from Reserve Cap-mAh and Design Capacity from "mA" to "mAh"Go
  • Data Block Summary: Updated several Class/Subclass descriptions to correct [RAM] vs [NVM] indication.Go

5 Device Comparison Table

PART NUMBER BATTERY TYPE CHEM_ID (1) FIRMWARE VERSION (2) COMMUNICATION FORMAT
bq27425YZFR-G2A LiCoO2
(4.2 V maximum charge)		 0x128 2.05
(0x0205)		 I2C
bq27425YZFT-G2A
bq27425YZFR-G2B LiMn2O4
(4.3 to 4.35 V maximum charge)		 0x312
bq27425YZFT-G2B
(1) Refer to the CHEM_ID subcommand to confirm the battery chemistry type.
(2) Refer to the FW_VERSION subcommand to confirm the firmware version.

 
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