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Diagnostic quality acquisition system for bio-electric sensors and bio-impedance measurements
  • Evaluation Evaluation

The HM301D is a highly integrated diagnostic-quality biopotential acquisition system with 3 differential channels. Multi master/slave configuration supports up to 16 channels of simultaneous sampling (12 biopotential acquisitions and 4 bio-impedance channels). A fully integrated high-pass filter removes the half-cell DC value to enable the channels to work with the AC component only. Each channel provides high resolution and low noise conversion of biopotential signals up to 10 kHz.

The input connection circuit matrix guarantees maximum flexibility in terms of electrode cables and connectors.

The HM301D includes a dedicated impedance measurement channel that can be used to measure both body impedance average value and variation due to respiration. This channel delivers both the real and the imaginary parts of the body and the breathing impedances. The WCT circuit and driver block implements the driving functions (right leg driver and shield driver) and the Wilson common terminal commonly used in ECG systems.

The electrode-to-skin contact is checked by injecting an AC or DC current. A digital filtering and preprocessing (DFP) block implements configurable band-pass filters, IQ impedance demodulation and enables specific algorithm implementation for lead-off check and pacemaker detection.

The SPI interface allows the exchange of data with both the microcontroller and other HM301D devices in case of chain connection. Full configurability and low power design techniques make it ideal for many applications, including battery-powered devices. High quality recordings are obtained with a small, power-saving system. The 3-channel version is available in a 6 x 6 mm 40-lead LGA.

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Errata Sheet
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Key Features

  • 3 biopotential acquisition channels with integrated analog high pass filters
  • 1 bio-impedance measurement channel with 2- or 4-wire measurement
  • Digital IQ demodulation
  • Integrated configurable digital filtering and preprocessing
  • Pacemaker pulse acquisition with embedded detection function (down to 0.1 mV impulse amplitude)
  • Input connection matrix allows support for different cable configurations
  • SPI daisy chain supports up to 4 ICs connection
  • Programmable analog gain: 8, 16, 32, 64
  • Low supply voltage: 1.62 V to 3.6 V
  • Input referred noise: 6 μVPP(300 Hz BW, G=64)
  • Maximum data rate: 125 kSPS per channel
  • Less than 1 mA/channel at full bandwidth and resolution
  • DC and AC lead-off detection
  • Right leg driver (RLD), Wilson common terminal (WCT) and shield driver (SD)
  • Clock reconfigurability
  • Built-in ring oscillator (±5% accuracy)
  • Built-in crystal oscillator (±0.1% accuracy)
  • External clock
  • Low external component count architecture
  • Allows compliance with medical standards ANSI/AAMI EC11, ANSI/AAMI EC13 and IEC60601-2-27
  • EMI tolerant

Design Resources


Technical Documentation

Product Specifications

Description Version Size
DS10278: Diagnostic-quality acquisition system for bio-electric sensors and bio-impedance measurements
5.0 3,200 KB

Related Tools and Software

Related Tools and Software

Part Number Description
STEVAL-IME002V1 Multi-lead electrocardiogram (ECG) and body impedance demonstration board
STEVAL-IME002V2 Single-lead electrocardiogram (ECG) and body impedance evaluation board

Publications and Collaterals


Description Version Size
HM301D ECG analog front-end
1.0 1,165 KB


Description Version Size
ST's Wellness Solution: Reliable Heart Monitoring
1.0 852 KB

Sample & Buy

Part Number Marketing StatusPackagePacking TypeOperating Temperature (min) Operating Temperature (max) Automotive GradeOrder From STUnit Price (US$)*
@ 1000
Distributor AvailabilityRoHS Compliance GradeDownload
Material Declaration**
HM301DLEvaluationLGA 6x6x0.9 40L Pitch 0.5mmTray-40100_-12No availability reported, please contact our Sales officeEcopack2-

(*) Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office or our Distributors
(**) The Material Declaration forms available on may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.
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