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


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)

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 ›

*Reference Rev B for latest designs.


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

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

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)

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