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HM301D ECG analog front-end

STMicroelectronics’ HM301D is the world’s most highly integrated front-end chip for ECG (Electrocardiogram) applications. This mixed-signal device provides all of the analog and digital signal-conditioning and filtering functions required to transform the small electrical signals picked up by the electrodes attached to the patient into fully conditioned digital data that can be stored or displayed in diagnostic-quality ECG equipment.

TARGETED APPLICATIONS• Cardiographs

• Bedsidemonitors

• Automaticexternaldefibrillators

• Holtermonitors

• Wearableremotemonitoring

• ECG(electrocardiogram)

• EEG(electroencephalogram)

• EMG(electromyography)

Fully integrated, mixed-signal diagnostic quality ECG acquisition system

KEY FEATURES• 3channelswithintegratedanaloghigh-passfilters

• Embeddedpacedetection

• 1bio-impedancechannelwith2-or4-wiremeasurement

• Configurabledigitalband-passfilteringforallchannels

• Multi-chipconfiguration

• Maximumdatarate:125kSPS

• Lessthan1mA/channelpowerconsumptionatfullbandwidthwithdriverson

• SPIserialinterface

• AvailableinLGA6x6mm,40leads

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For more information on ST products and solutions, visit www.st.comOrder code: FLHM301D0514

TheHM301Disahighlyintegrateddiagnostic-qualitybiopotentialacquisitionsystemwith3differentialandoneimpedancechannel.Multimaster/slaveconfigurationsupportsupto16channelsofsimultaneoussampling(12biopotentialacquisitionsand4bio-impedancechannels).Afullyintegratedanaloghigh-passfilterremovestheDCcomponentofthesignaltoenablethechannelstoworkwiththeACcomponentonly.Eachchannelprovideshighresolutionandlownoiseconversionofbiopotentialsignalsupto10kHz.Theinputconnectioncircuitmatrix

guaranteesmaximumflexibilityintermsofelectrodecablesandconnectors.TheHM301Dincludesadedicatedimpedancemeasurementchannelthatcanbeusedtomeasurebothbodyimpedanceaveragevalueandvariationduetorespiration.Thischanneldeliversboththerealandtheimaginarypartsofthebodyandthebreathingimpedances.TheWCTcircuitanddriverblockimplementsthedrivingfunctions(rightlegdriverandshielddriver)andtheWilsoncommonterminalcommonlyusedinECGsystems.Theelectrode-to-skincontactischeckedbyinjectinganACorDCcurrent.Adigital

filteringandpreprocessing(DFP)blockimplementsconfigurableband-passfilters,IQimpedancedemodulationandenablesspecificalgorithmimplementationforlead-offcheckandpacemakerdetection.TheSPIinterfaceallowstheexchangeofdatawithboththemicrocontrollerandotherHM301Ddevicesincaseofchainconnection.Fullconfigurabilityandlowpowerdesigntechniquesmakeitidealformanyapplications,includingbattery-powereddevices.Highqualityrecordingsareobtainedwithasmall,power-savingsystem.Itisavailableina6x6mm40-leadLGA.

Part numberInput channels

typImpedance

channelResolution(n)

typ (b)Gain typ (W/W)

Sample rate typ

Supply voltage min - max (V)

Current consumption typ (A)

Interface Package

HM301D 3 Yes 16 8 - 64 125 kSPS 1.7 - 3.6 0.003 SPI LGA 40L 6 x 6 x 0.9 mm

PRODUCT DETAILS

APPLICATION DIAGRAM

Currentinjection

Bat_bus

SPIslaveDC and AC

contact check

CIP

MISO

HM301D

MOSISSSCK

CIN

Ch1 bus

Impedancebus

Ch2 bus

Ch3 bus

ECG and pacemaker channel # 1

ECG and pacemaker channel # 2

ECG and pacemaker channel # 3

DC and ACcontact check

DC and ACcontact check

RA

RL LL

WCT circuitand drivers

Voltagereferences

Timinglogic and clock

Low-voltage supervisoryand battery charge check

Inputconnection

circuit

Digitalfilteringand

preprocessing

Bodyimpedance

measurement

IN1P

IN3PIN3N

WCTShield

RLD

IN2NIN2P

IN1NPace

makerdetection

TheSTEVAL-IME002V1andSTEVAL-IME002V2arerespectivelydesignedtodemonstratetheuseofHM301DinElectrocardiogram(ECG)andAutomatedExternalDefibrillator(AED)configurations.

• STEVAL-IME002V1Multi-leadelectrocardiogram(ECG)andbodyimpedancedemonstrationboard

• STEVAL-IME002V2Single-leadelectrocardiogram(ECG)andbodyimpedanceevaluationboard