Analog Devices MAXREFDES106#

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MAXREFDES106# Health Sensor Platform 4.0

Features

The MAXREFDES106# is a chest-worn device

that displays and logs biometric data. The

platform includes the following innovative

features:

 ECG-Based Heart Rate

 Optical PPG-based SpO

 BioZ-Based Respiration Rate

 Skin and Ambient Temperature

 Location Finder to Determine the Best

Placement Location

 Rechargeable 190mAh Battery

General Description

The MAXREFDES106# is a vital sign monitoring

platform in a chest-patch form factor. The

platform uses algorithms and high sensitivity

photoplethysmography (PPG),

electrocardiogram (ECG), bioimpedance (BioZ),

and temperature biosensor measurements to

calculate heart rate (HR), respiration rate (RR),

and blood oxygenation (SpO

). The vital signs

data can be displayed on a Microsoft Windows

graphical user interface (GUI) in real-time and

logged to a local file for further study.

The patch is designed for long-term passive

monitoring with a runtime of one day on a single

charge. The PPG acquisition system consists of

a red and infrared (IR) light emitter source and

two photodiode receivers. The MAX86178 AFE

includes dual high-resolution optical readout

signal-processing channels with robust ambient-

light cancellation, which is ideal for SpO

measurement. PPG and accelerometer data are

processed by the embedded algorithm inside of

the MAX32674C algorithm hub (Algo Hub) to

calculate SpO

. The ECG acquisition system

has three electrodes for continuous ECG, and

four electrodes for BioZ monitoring. The PC GUI

contains algorithms to filter the ECG and BioZ

data, and to calculate heart rate, respiration

rate, blood stroke volume, and cardiac output.

All algorithms are not publicly available. The

exception to this is the SpO

algorithm, which is

released as an .msbl file that is flashed to the

MAX32674C.

The patch also features measurements for both

skin temperature and ambient temperature

using two low-power consumption, highly

accurate MAX30210 temperature sensors.

The real-time vital signs can be viewed and

logged through Low Energy Bluetooth

communications available from the PC GUI

running on a Microsoft Windows PC.

Figure 1. MAXREFDES106# Vital Sign

Monitoring Patch

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Analog Devices MAXREFDES106# Specifications

General

Category	Medical Equipment
Type	Health Sensor Platform
ECG Channels	1
SpO2	Yes
Blood Pressure	No
Power Source	Battery
Operating Temperature Range	0°C to +70°C
Microcontroller	ARM Cortex-M4
Application	Wearable Health Monitoring
Interface	Bluetooth
Power Supply	3.7V
Features	Temperature
Sensor Type	ECG