1 Features
1• Single-Cell Li-Ion Battery Fuel Gauge
– Resides in Pack or on System Board
– Supports Embedded or Removable Batteries
– Powers Directly from Battery with Integrated
LDO
– Supports a Low-Value (10-mΩ) External Sense
Resistor
• Ultra-Low Power Consumption in NORMAL
(50 μA) and SLEEP (9 μA) Modes
• Battery Fuel Gauging Based on Compensated
End-of-Discharge Voltage (CEDV) Technology
– Reports Remaining Capacity and State-of-
Charge (SOC) with Smoothing Filter
– Adjusts Automatically for Battery Aging, Self-
Discharge, Temperature, and Rate Changes
– Provides Battery State-of-Health (Aging)
Estimation
• Microcontroller Peripheral Supports:
– 400-kHz I2C™ Serial Interface
– Configurable SOC Interrupt OR
Battery Low Digital Output Warning
– Internal Temperature Sensor OR
Host-Reported Temperature OR
External Thermistor

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

3 Description
The Texas Instruments bq27220 battery fuel gauge is
a single-cell gauge that requires minimal userconfiguration
and system microcontroller firmware
development, leading to quick system bring-up. The
bq27220 device uses the Compensated End-of-
Discharge Voltage (CEDV) 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 (%).
The bq27220 battery fuel gauge has ultra-low power
consumption in NORMAL (50 μA) and SLEEP (9 μA)
modes, leading to longer battery runtime.
Configurable interrupts help save system power and
free up the host from continuous polling. Accurate
temperature sensing is supported via an external
thermistor.
Customers can use preloaded CEDV parameters in
ROM or can generate custom chemistry parameters
using TI's web-based tool, GAUGEPARCAL. Customgenerated
parameters can be either programmed in
the device RAM by the host on power up of the
system or customers can program the parameters to
an onboard One-Time Programmable (OTP) memory.
Battery fuel gauging with the bq27220 device requires
connections only to PACK+ (P+) and PACK– (P–) for
a removable battery pack or embedded battery
circuit. The tiny, 9-ball, 1.62 mm × 1.58 mm, 0.5-mm
pitch NanoFree™ chip scale package (DSBGA) is
ideal for space-constrained applications.