系统板 6962

MAXREFDES1207: Heart-Rate Monitor Wrist Band Using the MAX77651B


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The MAXREFDES1207 is a reference design for wearable application based on a total Maxim® solution which includes the MAX32660, MAX30112, MAX77651B, and MAX40005. This solution demonstrates how a small size, low cost, low power, high accuracy heart-rate (HR) monitor can be easily implemented. This design can monitor heart rate using two green LEDs.

The MAX30112 is an optimized pulse-oximeter and heartrate AFE for wearable health. It has a high-resolution, optical readout signal-processing channel with built-in ambient light cancellation as well as high-current LED driver DACs to form a complete optical readout signal chain. With external LED(s) and photodiode(s), the MAX30112 offers the lowest power, highest performance heart-rate detection solution for wrist applications. The MAX77651B provides highly-integrated battery charging and power supply solutions for low-power wearable applications where size and efficiency are critical. The device features a SIMO buckboost regulator that provides three independently programmable power rails from a single inductor to minimize total solution size. A highly configurable linear charger supports a wide range of Li+ battery capacities and includes battery temperature monitoring for additional safety (JEITA). The MAX32660 is an ultra-low-power, cost-effective, highly- integrated microcontroller unit (MCU) designed for battery- powered devices and wireless sensors. It combines a flexible and versatile power management unit with the powerful Arm® Cortex®-M4 with floating point unit (FPU). The MAX40005 is a tiny, single comparator which is ideal for a wide variety of portable electronics applications such as cell phones, media players, and notebooks that have extremely tight board space and power constraints. The design also contains an FTDI FT234 USB-to-serial UART interface.

Key Features

  • Integrated solution
  • Small size
  • Low power
  • High accuracy
MAXREFDES1207 Board 放大+


This board is not available for purchase.

Designed, Built, Tested

This document describes the hardware shown above and provides a detailed systematic technical guide to designing a small-size, low-cost, low-power, high-accuracy heart-rate monitor. The design has been built and tested, details of which follow later in this document.

Design Resources

 
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MAX32660
低功耗Arm Cortex-M4 FPU处理器,带基于FPU的微控制器(MCU),256KB Flash和96KB SRAM

  • 用于可穿戴设备的高效微控制器
  • 电源管理最大程度延长电池应用的工作时间
  • 最优外设组合,提高平台扩展性

MAX30112
优化用于可穿戴健康设备的脉搏血氧仪和心率AFE

  • 反射或透射心率、心率变异或SpO2监测
  • 发送部分
  • 接收部分

MAX40005
nanoPower 4-Bump Comparator in Ultra-Tiny 0.73mm x 0.73mm WLP/SOT23 Packages

  • Tiny 0.73mm x 0.73mm, 4-Bump WLP and 5-Pin SOT23 Packages Save Board Space
  • Ultra-Low 500nA Operating Current Preserves Battery Power in Applications Where Comparator is Constantly Monitoring
  • 1.7V to 5.5V Supply Range Allows Operation from 1.8V, 2.5V, 3V, and 5V Systems

MAX77651
超低功耗PMIC集成了3输出SIMO和充电器,优化用于小型Li+电池供电产品

  • 高度集成
  • 低功耗
  • 经过优化的充电器用于小尺寸电池