SCL

SRX

VSYS

Coulomb

Bus

SDA

Counter

GPOUT

BIN

CPU

ADC

PACKP

Li-Ion

Cell

LDO

VDD

VSS

T

PACKN

Protection

IC

NFET NFET

1.8 V

BAT

BatteryPack

047 µF

.

1 µF

Integrated

Sense

Resistor

Product

Folder

Sample &

Buy

Technical

Documents

Tools &

Software

Support &

Community

bq27421-G1

SLUSB85E – MAY 2013 – REVISED JANUARY 2016

bq27421-G1 System-Side Impedance Track™ Fuel Gauge With Integrated Sense Resistor

1 Features

3 Description

The Texas Instruments bq27421-G1 fuel gauge is a

1

•

Single-Cell Li-Ion Battery Fuel Gauge

minimally configured microcontroller peripheral that

–

Resides on System Board

provides system-side fuel gauging for single-cell Li-

–

Supports Embedded or Removable Batteries

Ion batteries. The device requires very little user

configuration and system microcontroller firmware

–

Powered Directly from Battery with Integrated

development.

LDO

The bq27421-G1 fuel gauge uses the patented

–

Low-Value Integrated Sense Resistor

(7 m

Ω, Typical)

provides

information

such

as

remaining

battery

•

Easy-to-Configure Fuel Gauging Based on

capacity (mAh), state-of-charge (%), and battery

Patented Impedance Track™ Technology

voltage (mV).

–

Reports Remaining Capacity and State-of-

Battery fuel gauging with the bq27421-G1 fuel gauge

Charge (SOC) with Smoothing Filter

requires connections only to PACK+ (P+) and PACK–

–

Automatically Adjusts for Battery Aging, Self-

(P–) for a removable battery pack or embedded

Discharge, Temperature, and Rate Changes

battery circuit. The tiny 9-ball, 1.62 mm × 1.58 mm,

0.5-mm

pitch

NanoFree™

chip

scale

package

–

Battery State-of-Health (Aging) Estimation

(DSBGA) is ideal for space-constrained applications.

•

Microcontroller Peripheral Supports:

–

Device Information(1)

–

Configurable SOC Interrupt or

PART NUMBER

PACKAGE

BODY SIZE (NOM)

Battery Low Digital Output Warning

bq27421-G1

YZF (9)

1.62 mm × 1.58 mm

–

Internal Temperature Sensor or

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

Host-Reported Temperature

the end of the data sheet.

2 Applications

•

Smartphones, Feature Phones, and Tablets

•

Digital Still and Video Cameras

•

Handheld Terminals

•

MP3 or Multimedia Players

Simplified Schematic

1

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.