HM301D ECG analog front-end Fully integrated, mixed-signal diagnostic quality ECG acquisition system 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. KEY FEATURES TARGETED APPLICATIONS • 3 channels with integrated • Cardiographs analog high-pass filters • Bed side monitors • Embedded pace detection • Automatic external defibrillators • 1 bio-impedance channel • Holter monitors with 2- or 4-wire measurement • Configurable digital band-pass filtering for all channels • Wearable remote monitoring • ECG (electrocardiogram) • Multi-chip configuration • EEG (electroencephalogram) • Maximum data rate: 125 kSPS • EMG (electromyography) • Less than 1 mA/channel power consumption at full bandwidth with drivers on • SPI serial interface • Available in LGA 6 x 6 mm, 40 leads www.st.com The HM301D is a highly integrated diagnostic-quality biopotential acquisition system with 3 differential and one impedance channel. Multi master/slave configuration supports up to 16 channels of simultaneous sampling (12 biopotential acquisitions and 4 bio-impedance channels). A fully integrated analog high-pass filter removes the DC component of the signal 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. It is available in a 6 x 6 mm 40-lead LGA. APPLICATION DIAGRAM CIP CIN RA Current injection Body impedance measurement IN1P IN1N DC and AC contact check ECG and pace maker channel # 1 IN2P IN2N DC and AC contact check ECG and pace maker channel # 2 DC and AC contact check ECG and pace maker channel # 3 IN3P IN3N Input connection circuit Impedance bus Ch1 bus HM301D Digitalfiltering and preprocessing Ch2 bus SPI slave MISO MOSI SS SCK Pace maker detection Ch3 bus Bat_bus RL LL RLD WCT Shield WCT circuit and drivers Voltage references Timing logic and clock Low-voltage supervisory and battery charge check PRODUCT DETAILS Part number HM301D Input channels Impedance Resolution(n) Gain typ Sample rate Supply voltage Current consumption Interface typ channel typ (b) (W/W) typ min - max (V) typ (A) 3 Yes 16 8 - 64 125 kSPS 1.7 - 3.6 0.003 SPI Package LGA 40L 6 x 6 x 0.9 mm The STEVAL-IME002V1 and STEVAL-IME002V2 are respectively designed to demonstrate the use of HM301D in Electrocardiogram (ECG) and Automated External Defibrillator (AED) configurations. • STEVAL-IME002V1 Multi-lead electrocardiogram (ECG) and body impedance demonstration board • STEVAL-IME002V2 Single-lead electrocardiogram (ECG) and body impedance evaluation board © STMicroelectronics - May 2014 - Printed in United Kingdom - All rights reserved The STMicroelectronics corporate logo is a registered trademark of the STMicroelectronics group of companies All other names are the property of their respective owners Order code: FLHM301D0514 For more information on ST products and solutions, visit www.st.com