Product details


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  • HDQ (bq27000) or I2C (bq27200) Communication
  • Reports Accurate Time-to-Empty With Measured Load and Historical Maximum and Standby Loads
  • Reports Temperature, Voltage, and Current
  • High Accuracy Charge and Discharge Current Integration with Automatic Offset Calibration
  • Requires No User Calibration
  • Programmable Input/Output Port
  • Internal User EEPROM Configuration Memory
  • Automatic Capacity Reduction With Age
  • Stable Oscillator Without External Components
  • Dynamic End-of-Discharge Detection Delay to Allow Use in a High-Dynamic Load Environment
  • Automatic Sleep Mode When Communication Lines are Low
  • Available in a Small 3 mm x 4 mm QFN Package
  • Five Low-Power Operating Modes
    • Active: < 90 µA
    • Sleep: < 2.5 µA
    • Ship: < 2 µA (bq27000 only)
    • Hibernate: < 1.5 µA
    • Data Retention: < 20 nA
    • PDA
    • Smart Phones
    • MP3 Players
    • Digital Cameras
    • Internet Appliances
    • Handheld Devices

bqJUNIOR is a trademark of Texas Instruments.

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The bqJUNIOR™ series are highly accurate stand-alone single-cell Li-Ion and Li-Pol battery capacity monitoring and reporting devices targeted at space-limited, portable applications. The IC monitors a voltage drop across a small current sense resistor connected in series with the battery to determine charge and discharge activity of the battery. Compensations for battery temperature, self-discharge, and discharge rate are applied to the capacity measurments to provide available time-to-empty information across a wide range of operating conditions. Battery capacity is automatically recalibrated, or learned, in the course of a discharge cycle from full to empty. Internal registers include current, capacity, time-to-empty, state-of-charge, cell temperature and voltage, status, and more.

The bqJUNIOR can operate directly from single-cell Li-Ion and Li-Pol batteries and communicates to the system over a HDQ one-wire or I2C serial interface.

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Technical documentation

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Type Title Date
* Data sheet Single-Cell Li-Ion and Li-Pol Battery Gas Gauge IC For Portable Applications datasheet (Rev. D) Feb. 27, 2006
Application note Battery Authentication and Security Schemes (Rev. A) Jul. 17, 2014
User guide bq27000EVM Single Cell Battery Fuel Gauge Evaluation Module (Rev. B) Oct. 04, 2013
Application note Feature Set Comparison of bq27x00, bq27x10, bq27500, and bq27510 (Rev. A) Dec. 02, 2008
Application note HDQ Communication Basics (Rev. A) Sep. 18, 2008
Application note ESD and RF Mitigation in Handheld Battery Pack Electronics Mar. 06, 2008
Application note Single Cell Gas Gauge Circuit Design Feb. 22, 2008
Application note Single Cell Impedance Track Printed-Circuit Board Layout Feb. 22, 2008
More literature BQ27000_NanoEVM_ Schematic Feb. 13, 2007
More literature TPS712xx_NanoEVM_OV Jan. 29, 2007
Application note Complete battery-pack design for one- or two-cell portable applications Jul. 17, 2006
Application note Multicell Li-Ion and Li-Pol Battery Gas-Gauge Application Using the bqJunior May 26, 2006
Application note Using the bq27x00 With a Primary Cell Battery Dec. 15, 2005
User guide bq27x00 Single-Cell Battery Fuel Gauge Module Tester and Programmer Dec. 02, 2005
Application note Choosing Between Battery Gas Gauges & Monitors to Track Charge Availabilility Sep. 27, 2005
Application note Configuring the bq27000/200 for Gas Gauge Applications Aug. 29, 2005
Application note Building a Superior Battery Monitor with the bq27x00 Jun. 20, 2005

Design & development

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Design tools & simulation

SLUM102.ZIP (22 KB) - IBIS Model

CAD/CAE symbols

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VSON (DRK) 10 View options

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