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.