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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