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MAXREFDES103#: Wrist-Based SpO2, HR, and HRV Health Sensor Platform

SYSTEM BOARD 7141

MAXREFDES103#: Wrist-Based SpO2, HR, and HRV Health Sensor Platform


Overview


The MAXREFDES103# is a wrist-worn wearable form factor that demonstrates the high sensitivity and algorithm processing functions for health-sensing applications. This health sensor band platform includes an enclosure and a biometric sensor hub with an embedded algorithm for heart rate and SpO2 (MAX32664C) which processes PPG signals from the analog-front-end (AFE) sensor (MAX86141). Algorithm output and raw data can be streamed through Bluetooth® to an Android® app or PC GUI for demonstration, evaluation, and customized development.

Design files, firmware, and software can be found on the Design Resources tab. The board is also available for purchase.

Features

  • Photoplethysmography (PPG)
  • Wrist-based embedded heart rate, blood oxygen saturation (SpO2) algorithm
  • Heart rate variability (HRV), respiration rate, sleep quality library algorithm
  • Wearable health band form factor
  • MAX32664 sensor hub
  • MAX86141 PPG analog front-end
  • 3-axis accelerometer
  • Windows® and Android GUIs

Applications

  • Wearable sports watch
  • Healthcare tracker
  • Heart signal data tracker

How to Quickly Measure SpO2, HR, and HRV Blood from Your Wrist Using the MAXREFDES103
3:45 June 04, 2020


How to Get Your Healthcare Wearable Off the Ground Faster
1:45 June 10, 2020

MAXREFDES103# Enlarge+

Details

Introduction

The MAXREFDES103# contains enables quick evaluation of our hardware and embedded firmware for heart-rate and SpO2 monitoring on a wrist-based platform to significantly shorten development time for custom fitness, health, and clinical applications.

The MAXREFDES103# platform includes the following key components

  • Micro board, which includes the MAX32630 microcontroller, MAX20303 power-management IC (PMIC), dual-mode Bluetooth, and 6-axis accelerometer and gyroscope
  • Sensor board, which includes the MAX86141 AFE, optical heart-rate sensor with one green LED, one red LED, one IR LED, two photodiodes, and MAX32664C biometric sensor hub with an embedded algorithm for heart rate and SpO2 monitoring
  • MAXDAP Pico Adapter board for use during a firmware upgrade for the micro board
  • Health sensor band enclosure and straps
  • Hardware design files, firmware, and software

System Diagram

Figure 1. MAXREFDES103# system diagram.

User Guide

Required equipment

  • PC or Android device (e.g., tablet) with Bluetooth connection for data logging

Android is a registered trademark of Google Inc.
Arm and Cortex are registered trademarks of Arm Limited.
Maxim is a registered trademark of Maxim Integrated Products, Inc.
The Bluetooth word mark and logos are registered trademarks owned by Bluetooth SIG, Inc.
Windows is a registered trademark of Microsoft Corporation.

Design Resources

User Guide

Required equipment

  • PC or Android device (e.g., tablet) with Bluetooth connection for data logging

Download, read, and carefully follow each step in the MAXREFDES103# User Guide.

All Design Files

Download All Design Files

Hardware Files:

Each file includes schematic, BOM, PCB layout, fab package, and PCB CAD


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Parts Used

MAX32664
Ultra-Low Power Biometric Sensor Hub

  • Biometric Sensor Hub Enables Faster Time to Market
  • Finger-Based (Version A) Algorithms Measure
  • Wrist-Based (Version B) Algorithm Measures:

MAX20303
PMIC with Ultra Low IQ Voltage Regulators, Battery Charger and Fuel Gauge for Small Lithium Ion Systems

  • Extend Battery Use Time Between Battery Charging
  • Easy-to-Implement Li+ Battery Charging
  • Minimize Solution Footprint Through High Integration

MAX86141
Best-in-Class Optical Pulse Oximeter and Heart-Rate Sensor for Wearable Health

  • Complete Single-Channel, Optical Data Acquisition System
  • Optimized Architecture for Transmissive and Reflective Heart Rate or SpO2 Monitoring
  • Low Dark Current Noise of < 50pA RMS (Sample to Sample Variance)

MAX32630
Ultra-Low-Power Arm Cortex-M4 with FPU-Based Microcontroller (MCU) with 2MB Flash and 512KB SRAM

  • High-Efficiency Microcontroller for Wearable Devices
  • Power Management Maximizes Uptime for Battery Applications
  • Optimal Peripheral Mix Provides Platform Scalability

MAX4740
Quad SPDT Audio Switches

  • Low On-Resistance (0.61Ω typ)
  • 0.06Ω (typ) Channel-to-Channel Matching
  • 0.32Ω (typ) On-Resistance Flatness