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SCL

SRX

VSYS

Coulomb

Bus

SDA

Counter

GPOUT

BIN

CPU

ADC

PACKP

Li-Ion

Cell

LDO

VDD

VSS

T

PACKN

Protection

IC

NFET

NFET

1.8V

BAT

BatteryPack

I

2

C

047µF

.

1 µF

Integrated

Sense

Resistor

Product

Folder

Sample &

Buy

Technical

Documents

Tools &

Software

Support &

Community

bq27421-G1

SLUSB85E–MAY2013–REVISEDJANUARY2016

bq27421-G1System-SideImpedanceTrack™FuelGaugeWithIntegratedSenseResistor

1Features3Description

TheTexasInstrumentsbq27421-G1fuelgaugeisa

1

•Single-CellLi-IonBatteryFuelGauge

minimallyconfiguredmicrocontrollerperipheralthat

–ResidesonSystemBoard

providessystem-sidefuelgaugingforsingle-cellLi-

–SupportsEmbeddedorRemovableBatteries

Ionbatteries.Thedevicerequiresverylittleuser

configurationandsystemmicrocontrollerfirmware

–PoweredDirectlyfromBatterywithIntegrated

development.

LDO

Thebq27421-G1fuelgaugeusesthepatented

–Low-ValueIntegratedSenseResistor

ImpedanceTrack

TM

algorithmforfuelgauging,and

(7mΩ,Typical)

providesinformationsuchasremainingbattery

•Easy-to-ConfigureFuelGaugingBasedon

capacity(mAh),state-of-charge(%),andbattery

PatentedImpedanceTrack™Technology

voltage(mV).

–ReportsRemainingCapacityandState-of-

Batteryfuelgaugingwiththebq27421-G1fuelgauge

Charge(SOC)withSmoothingFilter

requiresconnectionsonlytoPACK+(P+)andPACK–

–AutomaticallyAdjustsforBatteryAging,Self-

(P–)foraremovablebatterypackorembedded

Discharge,Temperature,andRateChanges

batterycircuit.Thetiny9-ball,1.62mm×1.58mm,

0.5-mmpitchNanoFree™chipscalepackage

–BatteryState-of-Health(Aging)Estimation

(DSBGA)isidealforspace-constrainedapplications.

•MicrocontrollerPeripheralSupports:

–400-kHzI

2

CSerialInterface

DeviceInformation

(1)

–ConfigurableSOCInterruptor

PARTNUMBERPACKAGEBODYSIZE(NOM)

BatteryLowDigitalOutputWarning

bq27421-G1YZF(9)1.62mm×1.58mm

–InternalTemperatureSensoror

(1)Forallavailablepackages,seetheorderableaddendumat

Host-ReportedTemperature

theendofthedatasheet.

2Applications

•Smartphones,FeaturePhones,andTablets

•DigitalStillandVideoCameras

•HandheldTerminals

•MP3orMultimediaPlayers

SimplifiedSchematic

1

AnIMPORTANTNOTICEattheendofthisdatasheetaddressesavailability,warranty,changes,useinsafety-criticalapplications,

intellectualpropertymattersandotherimportantdisclaimers.PRODUCTIONDATA.

Product specificaties