SLUSC53A May 2015  – December 2015

PRODUCTION DATA. 

  1. Features
  2. Applications
  3. Description
  4. Simplified Schematic
  5. Revision History
  6. Device Comparison Table
  7. Pin Configuration 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 Supply Current
    6. 8.6 Digital Input and Output DC Characteristics
    7. 8.7 Power-On Reset
    8. 8.8 2.5-V LDO Regulator
    9. 8.9 Internal Clock Oscillators
    10. 8.10Integrating ADC (Coulomb Counter) Characteristics
    11. 8.11ADC (Temperature and Cell Voltage) Characteristics
    12. 8.12Data Flash Memory Characteristics
    13. 8.13HDQ Communication Timing Characteristics
    14. 8.14I2C-Compatible Interface Timing Characteristics
    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. 9.3.3Power Control
        1. 9.3.3.1Reset Functions
        2. 9.3.3.2Wake-Up Comparator
        3. 9.3.3.3Flash Updates
      4. 9.3.4Autocalibration
      5. 9.3.5Communications
        1. 9.3.5.1Authentication
        2. 9.3.5.2Key Programming (Data Flash Key)
        3. 9.3.5.3Key Programming (Secure Memory Key)
        4. 9.3.5.4Executing an Authentication Query
        5. 9.3.5.5HDQ Single-Pin Serial Interface
        6. 9.3.5.6HDQ Host Interruption Feature
          1. 9.3.5.6.1Low Battery Capacity
          2. 9.3.5.6.2Temperature
        7. 9.3.5.7I2C Interface
          1. 9.3.5.7.1I2C Time Out
          2. 9.3.5.7.2I2C Command Waiting Time
          3. 9.3.5.7.3I2C Clock Stretching
    4. 9.4Device Functional Modes
      1. 9.4.1Power Modes
        1. 9.4.1.1NORMAL Mode
        2. 9.4.1.2SLEEP Mode
        3. 9.4.1.3FULLSLEEP Mode
        4. 9.4.1.4HIBERNATE Mode
      2. 9.4.2System Control Function
        1. 9.4.2.1SHUTDOWN Mode
        2. 9.4.2.2INTERRUPT Mode
      3. 9.4.3Security Modes
        1. 9.4.3.1Sealing and Unsealing Data Flash
    5. 9.5Programming
      1. 9.5.1Standard Data Commands
        1. 9.5.1.1Control(): 0x00 and 0x01
    6. 9.6Register Maps
      1. 9.6.1Pack Configuration Register
      2. 9.6.2Pack Configuration B Register
      3. 9.6.3Pack Configuration C Register
  10. 10Application and Implementation
    1. 10.1Application Information
    2. 10.2Typical Applications
      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. 10.2.2.7VCC LDO Output Filtering
    3. 10.3Application Curves
  11. 11Power Supply Recommendations
    1. 11.1Power Supply Decoupling
  12. 12Layout
    1. 12.1Layout Guidelines
      1. 12.1.1Sense Resistor Connections
      2. 12.1.2Thermistor Connections
      3. 12.1.3High-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:
    • 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 15-Ball Nano-Free™ (DSBGA) Packaging

2 Applications

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

3 Description

The bq27546-G1 Li-Ion battery fuel gauge is a microcontroller peripheral that provides fuel gauging for single-cell Li-Ion battery packs. The device requires minimal system microcontroller firmware development for accurate battery fuel gauging. The bq27546-G1 resides within the battery pack or on the system’s main-board with an embedded battery (non-removable).

The bq27546-G1 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 (min.), battery voltage (mV), and temperature (°C). It also provides detections for internal short or tab disconnection events.

The bq27546-G1 features integrated support for secure battery pack authentication, using the SHA-1/HMAC authentication algorithm.

The device comes in a 15-ball Nano-Free™ DSBGA package (2.61 mm × 1.96 mm) that is ideal for space-constrained applications.

Device Information(1)

PART NUMBERPACKAGEBODY SIZE (NOM)
bq27546-G1YZF (15)2.61 mm × 1.96 mm
  1. For all available packages, see the orderable addendum at the end of the data sheet.

4 Simplified Schematic

bq27546-G1 Simp_Sch.gif