1 Features
1• 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 x 2.75 mm x 1.75 mm Pitch
NanoFree™ (DSBGA) Package

2 Applications
• Smartphones, Feature Phones, and Tablets
• Wearables
• Building Automation
• Portable Medical/Industrial Handsets
• Portable Audio
• Gaming

3 Description
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-ofhealth
(%).
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 spaceconstrained
applications.