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[原创] ST HM301D和STM32诊断级生物电采集系统STEVAL-IME002Vx

关键词:医疗电子 传感器 MCU STEVAL-IME002Vx

时间:2016-05-04 10:45:46       作者:ST       来源:中电网

ST公司的HM301D是具有三个差分通路的高度集成诊断级生物电采集系统,多个主/从配置支持多达16路同时取样(12路生物电位采集和4路生物阻抗),全集成高通滤波器,每路具有高分辨率和低噪音,输入参考噪音6 μVPP (300 Hz BW,G=64),生物电信号转换高达10kHz,最大数据速率125kSPS,工作电压1.62V-3.6V.主要用在心电图(ECG),病床监视,Holter,临床环境图,自动体外除颤器(AED),脑电图(EEG),肌电图(EMG),可穿戴遥控监视.医疗设备等.本文介绍了HM301D主要特性,框图,标准12线ECG链连接图以及基于HM301D和STM32的评估板STEVAL- IME002Vx主要特性,框图,电路图,材料清单和PCB元件布局图.

The HM301D is a highly integrated diagnostic-quality biopotential acquisition system with 3differential channels. Multi master/slave configuration supports up to 16 channels of simultaneous sampling (12 biopotential acquisitions and 4 bio-impedance channels). A fullyintegrated high-pass filter removes the half-cell DC value to enable the channels to workwith 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 channeldelivers 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 filteringand preprocessing (DFP) block implements configurable band-pass filters, IQ impedancedemodulation and enables specific algorithm implementation for lead-off check andpacemaker 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 isavailable in a 6 x 6 mm 40-lead LGA.

The HM301D contains a dedicated digital signal processing with the followingfunctionalities:
 User configurable signal filtering: low pass and high pass;
 Simultaneous processing of both High Resolution/Low Bandwidth (HRLB) and HighBandwidth/Low resolution (HBLR) signals (e.g. ECG and Pacemaker);
 IQ impedance demodulation (Real and Imaginary part);
 Standard SPI communication;
 Device configuration settings;

HM301D主要特性:

 3 biopotential acquisition channels withintegrated analog high pass filters
 1 bio-impedance measurement channel with 2-or 4-wire measurement
 Digital IQ demodulation
 Integrated configurable digital filtering andpreprocessing
 Pacemaker pulse acquisition with embeddeddetection function (down to 0.1 mV impulseamplitude)
 Input connection matrix allows support fordifferent cable configurations
 SPI daisy chain supports up to 4 ICsconnection
 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 andresolution
 DC and AC lead-off detection
 Right leg driver (RLD), Wilson commonterminal(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 standardsANSI/AAMI EC11, ANSI/AAMI EC13 and
IEC60601-2-27
 EMI tolerant

HM301D应用:

 ECG (electrocardiogram)
 Carts for clinical environments
 Bedside monitoring
 Holter monitors
 Automated external defibrillator (AED)
 EEG (electroencephalogram)
 EMG (electromyography)
 Wearable remote monitoring
 Medical equipment

图1.HM301D框图

图2.HM301D标准12线ECG链连接图

基于HM301D和STM32的评估板STEVAL- IME002Vx

STEVAL- IME002Vx demonstration boards based on the HM301D and STM32
The STEVAL-IME002Vx represent the family of demonstration boards designed around thenew HM301D diagnostic quality analog front-end device for bio-electric sensors and bioimpedancemeasurements.

This family of boards consists of two demonstration boards: STEVAL-IME002V1 and STEVAL-IME002V2 designed to demonstrate the use of the HM301D in, respectively, Electrocardiographs (ECGs) (or patient monitoring systems) and Automated External Defibrillator (AED) configurations.

The boards also host a 32-bit microcontroller of the STM32 family which manages the SPI protocol of the HM301D and the USB communication from/to the PC. Both boards can be easily used with a graphical user interface to demonstrate all the different configurations.

图3.评估板STEVAL- IME002Vx外形图

评估板STEVAL- IME002Vx主要特性:

• Two power supply options: USB connector and external power connector
• Up to three HM301D devices: 12-lead ECG with bio-impedance measurement
• STG3692 low-voltage high-bandwidth quad SPDT switch to manage the HM301D SPI
• STM32F103CBT6: low-power high-performance 32-bit microcontroller powered by ARM®Cortex™-M3
• ESDALCL6-2SC6 provides ESD protection with very low capacitance
• USB 2.0 full-speed connection
• SWD/JTAG connector to program the MCU
• 37 debug test points to interact electrically with the ICs mounted on the board
• Reset button
• User LED and pushbutton
• Graphical user interface to manage the HM301D and display data outputs
• Device Firmware Upgrade (DFU) procedure for easy upgrades of the STM32 firmware

图4.评估板STEVAL- IME002Vx框图
STEVAL-IME002Vx ECG配置表:


图5.SPI菊花链框图

图6.评估板STEVAL- IME002Vx电路图:HM301D部分

图7.评估板STEVAL- IME002Vx电路图:ECG连接器

图8.评估板STEVAL- IME002Vx电路图:ESD保护

图9.评估板STEVAL- IME002Vx电路图:连接器和按钮

图10.评估板STEVAL- IME002Vx电路图:MCU

图11.评估板STEVAL- IME002Vx电路图:电源管理
评估板STEVAL- IME002V1材料清单:




评估板STEVAL- IME002V2材料清单:





图12.评估板STEVAL- IME002Vx PCB顶层布局图
详情请见:
http://www2.st.com/content/ccc/resource/technical/document/datasheet/99/5f/a5/9b/5c/44/43/68/
DM00112265.pdf/files/DM00112265.pdf/jcr:content/translations/en.DM00112265.pdf

http://www2.st.com/content/ccc/resource/technical/document/user_manual
/43/72/20/57/37/a8/44/66/DM00078087.pdf/files/DM00078087.pdf/jcr:content/translations/en.DM00078087.pdf

以及http://www2.st.com/content/ccc/resource/technical/layouts_and_diagrams/schematic_pack/c6/e6/dc/61/d6/b5/
41/2b/stevalime002v1_schematic.pdf/files/stevalime002v1_schematic.pdf/jcr:content/translations/en.steval-ime002v1_schematic.pdf

en.DM00078087.pdf
en.DM00112265.pdf
en.steval-ime002v1_schematic.pdf

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