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[原创] Maxim MAX30001超低功耗单路生物电位和阻抗模拟前端解决方案

关键词:可穿戴设备 生物电位(ECG) 生物阻抗(BioZ) MAX30001

时间:2018-08-27 11:16:03       作者:Maxim       来源:中电网

Maxim公司的MAX30001是超低功耗单路生物电位(ECG,R–R和步速检测)和生物阻抗步速检测模拟前端(AFE)解决方案,生物电位和生物阻抗通路具有ESD保护,EMI滤波,内部电极偏压,DC电极断线检测,待机模式电极连线检测,以及用于内置自测的大范围校准电压.生物电位通路提供ECG波形,心率和起搏器边缘检测,而生物阻抗通路能够测量呼吸.主要用在心律失常检测,病人监护无线贴片,生物认证和ECG按需应用,呼吸和水合监测仪以及基于阻抗的心率检测.本文介绍了MAX30001主要优势和特性,功能框图和应用电路,以及评估系统MAX30001 EVK主要特性,应用电路,电路图,材料清单和PCB设计图.

The MAX30001 is a complete, biopotential and bioimpedance (BioZ), analog front-end (AFE) solution for wearable applications. It offers high performance for clinical and fitness applications, with ultra-low power for long battery life. The MAX30001 is a single biopotential channel providing electrocardiogram (ECG) waveforms, heart rate and pacemaker edge detection, and a single bioimpedance channel capable of measuring respiration.

The biopotential and bioimpedance channels have ESD protection, EMI filtering, internal lead biasing, DC leads-off detection, ultra-low-power, leads-on detection during standby mode, and extensive calibration voltages for built-in self-test. Soft power-up sequencing ensures no large transients are injected into the electrodes. Both channels also have high input impedance, low noise, high CMRR, programmable gain, various low-pass and high-pass filter options, and a high resolution analog-to-digital converter. The biopotential channel is DC coupled, can handle large electrode voltage offsets, and has a fast recovery mode to quickly recover from overdrive conditions, such as defibrillation and electro-surgery. The bioimpedance channel includes integrated programmable current drive, works with common electrodes, and has the flexibility for 2 or 4 electrode measurements. It also has AC lead off detection.

The MAX30001 is available in a 28-pin TQFN and 30-bump wafer-level package (WLP),operating over the0℃ to+70℃ commercial temperature range.

MAX30001主要优势和特性:

Clinical-Grade ECG and BioZ AFE with High Resolution Data Converter15.9 Bits ENOB with 3.1μVPP (typ) Noise for ECG
17 Bits ENOB with 1.1μVPP Noise for BioZ
Better Dry Starts Due to Much Improved Real World CMRR and High Input ImpedanceFully Differential Input Structure with CMRR > 100dB
Offers Better Common-Mode to Differential Mode Conversion Due to High Input Impedance
High Input Impedance > 1GΩ for Extremely Low Common-to-Differential Mode
Minimum Signal Attenuation at the Input During Dry Start Due to High Electrode Impedance
High DC Offset Range of ±650mV (1.8V, typ) Allows to Be Used with Wide Variety of Electrodes
High AC Dynamic Range of 65mVPP for ECG and 100mVPP for BioZ Will Help Prevent Saturation in the Presence of Motion/Direct Electrode Hits
Longer Battery Life Compared to Competing Solutions85μW at 1.1V Supply Voltage for ECG
158μW at 1.1V Supply Voltage for BioZ
Leads-On Interrupt Feature Allows to KeepμC in Deep Sleep Mode Until Valid Lead Condition is DetectedLead-On Detect Current: 0.7μA (typ)
Built-In Heart Rate Detection with Interrupt Feature Eliminates the Need to Run HR Algorithm on the μControllerRobust R-R Detection in High Motion Environment at Extremely Low Power
Configurable Interrupts Allows the μC Wake-Up Only on Every Heart Beat Reducing the Overall System Power
High Accuracy Allows for More Physiological Data Extractions
32-Word ECG and 8-Word BioZ FIFOs Allows the MCU to Stay Powered Down for 256ms with Full Data Acquisition
High-Speed SPI Interface
Shutdown Current of 0.5μA (typ)

MAX30001应用:

Single-Lead Event Monitors for Arrhythmia Detection
Single-Lead Wireless Patches for In-Patient/Out-Patient Monitoring
Chest Band Heart Rate Monitors for Fitness Applications
Bio Authentication and ECG-On-Demand Applications
Respiration and Hydration Monitors
Impedance Based Heart Rate Detection

图1.MAX30001功能框图

图2.MAX30001 ECG输入复接图

图3.MAX30001BioZ输入复接图

图4.MAX30001双电极ECG和呼吸监视器典型应用电路图

图5.MAX30001四电极ECG和呼吸监视器典型应用电路图

图6.MAX30001带可选共双纤颤保护的双电极ECG和呼吸监视器典型应用电路图

图7.MAX30001带可选共双纤颤保护的四电极ECG和呼吸监视器典型应用电路图

评估系统MAX30001 EVK

The MAX30001 evaluation system (EV system) providesa single platform to evaluate the functionality and featuresof the MAX30001 with Biopotential (ECG, R-to-R, andPace Detection) and Bioimpedance (BioZ)measurementcapabilities. The EV system includes a MAX30001 evaluationkit (EV kit) and a MAX32630FTHR Cortex-M4Fmicrocontroller for wearables. The MAX32630FTHRprovides power to the MAX30001 EV kit and contains thefirmware necessary to use the EV kit GUI program. TheEV kit ships with jumpers installed and supply voltages setto typical operating values. Optional connections exist whichcan be shunted to make use of diff erent functionalities.

Note that the MAX30002 is register compatible with theMAX30001. By disabling the ECG, PACE, and R-to-Rblocks, the MAX30001 is equivalent to the MAX30002and the EV kit evaluates the MAX30002 functionality andperformance.

评估系统MAX30001 EVK主要特性:

● Convenient Platform to Evaluate the MAX30001
● Many Easy-to-Reach Test Points
● Measure Individual Supply Currents
● Touchproof Cable Connectors
● Windows® 7/8/10 Compatible GUI software
● Fully Assembled and Tested
● Facilitates IEC 60601-2-47 Compliance Testing
● Ultra-Low-Power Design

评估系统MAX30001 EVK包括:

● MAX30001 EV kit
● MAX32630FTHR
● USB A to micro-USB cable
● Three (3) ECG cables

图8.评估系统MAX30001 EVK外形图

图9.评估系统MAX30001 EVK简化电路图

图10.评估系统MAX30001 EVK电路图(1)

图11.评估系统MAX30001 EVK电路图(2)
评估系统MAX30001 EVK材料清单:


图12.评估系统MAX30001 EVK PCB设计图(1):顶层丝印

图13.评估系统MAX30001 EVK PCB设计图(2):顶层

图14.评估系统MAX30001 EVK PCB设计图(3):层2

图15.评估系统MAX30001 EVK PCB设计图(4):层3

图16.评估系统MAX30001 EVK PCB设计图(5):底层

图17.评估系统MAX30001 EVK PCB设计图(6):底层丝印

详情请见:
https://datasheets.maximintegrated.com/en/ds/MAX30001.pdf
https://datasheets.maximintegrated.com/en/ds/MAX30001EVSYS.pdf
MAX30001.pdf
MAX30001EVSYS.pdf

 

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