BQ27320

• Battery Fuel Gauge For System-/Pack-Side
  Configuration
• Compensated End-of-Discharge Voltage (CEDV)
  Gauging Technology
  • Adjusts for Battery Aging, Self-Discharge,
    Temperature, and Rate Changes
  • Reports Remaining Capacity, State-of-Charge
    (SOC), and Time-to-Empty with Smoothing
    Filter
  • Battery State-of-Health Estimation
  • Supports Embedded or Removable Packs
    from 100-mAhr to 14,500-mAhr Capacity
  • Accommodates Pack Swapping with up to
    Four Separate Battery Profiles
  • Supports a Raw Coulomb Counter To Provide
    Delta Capacity Information
• Microcontroller Peripheral Supports:
  • SDQ Communication Interface for
    Authentication ID
  • 400-kHz I²C™ Serial Interface for High-Speed
    Communication
  • 32 Bytes of Scratch-Pad FLASH NVM
  • Battery Low Digital Output Warning
  • Configurable SOC Interrupts
  • External Thermistor, Internal Sensor, or Host
    Reported Temperature Options
• 15-Pin 1.375 mm × 2.75 mm × 1.75 mm
  Pitch NanoFree™ (DSBGA) Package

The Texas Instruments single-cell bq27320 battery fuel gauge requires very minimal configuration and system microcontroller firmware development, leading to quick system bring-up. The bq27320 uses the Compensated End-of-Discharge Voltage (CEDV) gas gauging algorithm for fuel gauging, and provides information such as remaining battery capacity (mAh), state-of-charge (%), runtime-to-empty (min), battery voltage (mV), temperature (°C) and state-of-health (%).

TI customers can tune chemistry parameters using TI’s web-based tool, GAUGEPARCAL.

Configurable interrupts help save system power and free up the host from continuous polling. Accurate temperature sensing is supported via an external thermistor.

Battery fuel gauging with the bq27320 requires only PACK+ (P+), PACK– (P–), and optional thermistor (T) connections to a removable battery pack or embedded battery circuit. The device uses a 15-ball NanoFree™ (DSBGA) package. It is ideal for space-constrained applications.