Product details

Cell chemistry Lead Acid, Li-Ion/Li-Polymer, NiCd, NiMH Number of series cells Single Cell Communication interface HDQ Battery capacity (Min) (mAh) 300 Battery capacity (Max) (mAh) 6000 Implementation Pack, System External capacity indication None Features Coulomb Counter Operating temperature range (C) 0 to 70 Cell balancing
Cell chemistry Lead Acid, Li-Ion/Li-Polymer, NiCd, NiMH Number of series cells Single Cell Communication interface HDQ Battery capacity (Min) (mAh) 300 Battery capacity (Max) (mAh) 6000 Implementation Pack, System External capacity indication None Features Coulomb Counter Operating temperature range (C) 0 to 70 Cell balancing
TSSOP (PW) 8 19 mm² 3 x 6.4
  • Reports Accurate State-of-Charge in Li-Ion and Li-Pol Cells, No System Processor Calculations Needed
  • Reports Cell Temperature and Voltage
  • High-Accuracy Coulometric Charge and Discharge Current Integration with Automatic Offset Cancellation
  • Requires No Offset Calibration
  • Programmable Input/Output Port
  • Internal Time-Base Eliminates External Crystal Oscillator
  • Four Automatic Low-Power Operating Modes
    • Active: < 100 µA
    • Sleep: < 2.5 µA
    • Ship: < 1.7 µA
    • Hibernate: < 1.5 µA
  • Small 8-Pin TSSOP Package
  • APPLICATIONS
    • PDAs
    • Smart Phones
    • MP3 Players
    • Digital Cameras
    • Internet Appliances
    • Handheld Devices

  • Reports Accurate State-of-Charge in Li-Ion and Li-Pol Cells, No System Processor Calculations Needed
  • Reports Cell Temperature and Voltage
  • High-Accuracy Coulometric Charge and Discharge Current Integration with Automatic Offset Cancellation
  • Requires No Offset Calibration
  • Programmable Input/Output Port
  • Internal Time-Base Eliminates External Crystal Oscillator
  • Four Automatic Low-Power Operating Modes
    • Active: < 100 µA
    • Sleep: < 2.5 µA
    • Ship: < 1.7 µA
    • Hibernate: < 1.5 µA
  • Small 8-Pin TSSOP Package
  • APPLICATIONS
    • PDAs
    • Smart Phones
    • MP3 Players
    • Digital Cameras
    • Internet Appliances
    • Handheld Devices

The bq26500, the first in the bqJUNIOR™ family of advanced gas gauge device for handheld applications, is a highly accurate standalone single-cell Li-Ion and Li-Pol battery capacity monitoring and reporting device targeted at space limited portable applications. The device 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 rate of discharge are applied to the charge counter to provide available capacity 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 available capacity, cell temperature and voltage, state-of-charge, and status and control registers.

The bq26500 can operate directly from single-cell Li-Ion and Li-Pol batteries and communicates to the system over a simple one-wire bi-directional serial interface. The 5-kbits/s HDQ bus interface reduces communication overhead in the external microcontroller.

The bq26500, the first in the bqJUNIOR™ family of advanced gas gauge device for handheld applications, is a highly accurate standalone single-cell Li-Ion and Li-Pol battery capacity monitoring and reporting device targeted at space limited portable applications. The device 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 rate of discharge are applied to the charge counter to provide available capacity 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 available capacity, cell temperature and voltage, state-of-charge, and status and control registers.

The bq26500 can operate directly from single-cell Li-Ion and Li-Pol batteries and communicates to the system over a simple one-wire bi-directional serial interface. The 5-kbits/s HDQ bus interface reduces communication overhead in the external microcontroller.

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Technical documentation

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Type Title Date
* Data sheet bq26500 Single Cell Li-Ion and Li-Pol Battery Gas Gauge IC datasheet (Rev. A) 09 Oct 2003
User guide bq26500 Single Cell Battery Fuel Guage Evaluation Module (Rev. A) 04 Oct 2013
Application note HDQ Communication Basics (Rev. A) 18 Sep 2008
Application note ESD and RF Mitigation in Handheld Battery Pack Electronics 06 Mar 2008
Analog design journal Complete battery-pack design for one- or two-cell portable applications 17 Jul 2006
Application note Choosing Between Battery Gas Gauges & Monitors to Track Charge Availabilility 27 Sep 2005
Application note Determining the Values to Program the bq26500/bq26501 EEPROM 17 Jun 2004
Application note HDQ Compatibility Between OMAP and BQ Products 17 Jun 2004
User guide bq2650x Tester-Kit Single Cell Battery Fuel Gauge Test and Program (Rev. A) 23 Apr 2004
Application note Configuring the bq26500 for Gas Gauging Applications 15 Sep 2003

Design & development

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