Host System

Single Cell Li-lon

Battery Pack

PACK-

PROTECTION

IC

CHG

DSG

Temp

Sense

SOC_INT

Current

Sense

T

PACK+

Voltage

Sense

FETs

Power

Management

Controller

VCC

DATA

LDO

I2C

SDQ

CE

BAT_GD

Product

Folder

Sample &

Buy

Technical

Documents

Tools &

Software

Support &

Community

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.

bq27320

SLUSCG9A – FEBRUARY 2016 – REVISED MARCH 2016

bq27320 Single-Cell CEDV Fuel Gauge

1

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

–

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-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.

Device Information(1)

PART NUMBER

PACKAGE

BODY SIZE (NOM)

bq27320

YZF (15)

1.375 mm x 2.75 mm

x 1.75 mm

(1) For all available packages, see the orderable addendum at

the end of the data sheet.

Simplified Schematic