System Board 6779

MAXREFDES101#: Health Sensor Platform 2.0

The MAXREFDES101# is a unique evaluation and development platform in a wrist-worn wearable form factor that demonstrates the functions of a wide range of Maxim’s products for health-sensing applications. This second-generation health sensor platform (a follow-on to the MAXREFDES100#) integrates a PPG analog-front-end (AFE) sensor (MAX86141), a biopotential AFE (MAX30001), a human body temperature sensor (MAX30205), a microcontroller (MAX32630), a power-management IC (MAX20303), and a 6-axis accelerometer/gyroscope. The complete platform includes a watch enclosure and a biometric sensor hub with an embedded heart-rate algorithm (MAX32664). 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 under the Design Resources tab. The board is also available for purchase.


  • Photoplethysmography (PPG)
  • Biopotential measurement (ECG)
  • Skin temperature
  • Embedded heart-rate algorithm
  • Motion and rotation
  • Wearable watch form factor


  • Wearable sports watch
  • Healthcare tracker
  • On-demand ECG monitor
  • Heart signal data tracker
MAXREFDES101# Package Enlarge+


The MAXREFDES101# is the second generation in our family of health sensor development platforms. Like the previous generation, MAXREFDES100#, the MAXREFDES101# enables quick evaluation of our portfolio of wearable products to significantly shorten the development time for custom fitness, health, and clinical applications.

The MAXREFDES101# 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 LEDs and two photodiodes, MAX30001 ECG sensor, MAX30205 body temperature sensor, and MAX32664 biometric sensor hub with an embedded heart-rate algorithm
  • Pico adaptor board for use during a firmware upgrade for the micro board only
  • Watch enclosure
  • Hardware design files, firmware, and software

MAXREFDES101# Package Enlarge+

MAXREFDES101# sensor board stacked.

Micro board.Micro board.

Sensor board.Sensor board.

System Diagram

Sensor board.MAXREFDES101# system diagram.

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 appropriate MAXREFDES101#User Guide.

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

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 appropriate MAXREFDES101# User Guide.

All Design Files

Download All Design Files

Hardware Files:
Each file includes schematic, BOM, PCB layout, fab package, and PCB CAD
MAX32630 Micro Board
MAXREFDES101# HRM LED-Photodiode Board
MAXREFDES101# Sensor Board: (Rev B)* | (Rev A)
Mechanical: (Rev B)* | (Rev A)

*Reference Rev B for latest designs.

The ARM mbed development environment is supported for developers who want to customize the operation of the platform. The companion MAXREFDES101HDK# programming adapter that ships with the platform provides driverless drag-and-drop programming for firmware updates as well as a virtual UART interface and CMSIS-DAP compatible debugger. More details on firmware development and source code examples ›


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:

Ultra-Low-Power, Single-Channel Integrated Biopotential (ECG, R-to-R, and Pace Detection) and Bioimpedance (BioZ) AFE

  • Can be Used in IEC 60601-2-47:2012 Compliant Systems
  • Clinical-Grade ECG AFE with High-Resolution Data Converter
  • Better Dry Starts Due to Much Improved Real World CMRR and High Input Impedance

Wearable Power Management Solution

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

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

  • Complete Single-Channel, Optical Data Acquisition System
  • Built-in Algorithm Further Enhances Rejection of Fast Ambient Transients
  • Optimized Architecture for Transmissive and Reflective Heart Rate or SpO2 Monitoring

Human Body Temperature Sensor

  • High Accuracy and Low-Voltage Operation Aids Designers in Meeting Error and Power Budgets
  • One-Shot and Shutdown Modes Help Reduce Power Usage
  • 600µA (typ) Operating Supply Current

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