随着物联网技术的发展，可穿戴式产品技术得到广泛的普及，其中可穿戴健康检测仪能随时随地检测人体的多种主要生理指标，并在指标出现异常时发出警报，将监测信息通过无线传送到专业设备或个人手机。目前市面上已经出现各种可穿戴的健康检测仪，有心率监测仪、血压监测仪，脂肪含量测试仪、睡眠监测仪等等，本文主要介绍CypressPSoCBLE在可穿戴心率监测仪上的应用。

心率是指单位时间内心脏搏动的次数。它是反映心脏是否正常工作的一个重要参数。同时心率值也是衡量体力劳动强度和脑力劳动强度的重要指标。因此，设计一种可随时穿戴、可长时间记录、显示和存储心率值，可以和手机蓝牙通信并具有较强抗干扰能力，能对超出正常范围的心率进行报警的心率测试仪是十分必要的。

设计心率监测仪产品主要会遇到如下一些问题：

1、需要低功耗蓝牙通信和手机进行信息交互，及时给使用者反馈测试的心率信息，并允许使用者通过手机进行相关设置;

2、需要使用AFE(模拟前端)电路和滤波电路来对心率信号进行测量，AD的采样精度对心率信号的准确度有较大的影响;

3、需要给客户提供用户按键接口，如电容触摸按键等;

4、需要提供一个段码LCD液晶显示屏显示测量的心率值;

5、需要实现低功耗延长产品的待机时间，从而可以使用纽扣电池供电。

CYPRESS的PSoCBLE系列产品可以解决上述设计的问题和需求。PSoC®4是一个可扩展和可重配置的平台架构，包含ARM®Cortex®-M0CPU的可编程嵌入式系统控制器。它把可编程、可重新配置的模拟和数字模块与灵活的自动布线资源相结合。基于该平台的PSoCBLE系列产品集成了低功耗蓝牙(简称BLE，还称为BluetoothSmart)的微控制器、无线模块和子系统。其他功能包括数字可编程逻辑、高性能的模数转换(ADC)、比较器模式的运算放大器以及标准通信和时序外设。

如下是PSoCBLE心率监测仪解决方案的原理框图。

PSoCBLE系列产品针对心率监测仪提供了简单易实现的单芯片BLE解决方案，同时提供了标准的心率测试Profile案例供开发者参考。片内提供了可编程的运算放大器和SARADC，可用于心率信号的检测和滤波。该产品集成了电容触摸按键、滑条和触控板的CapSense用户接口，还集成了LCD段码液晶屏驱动可用于显示心率信号。针对低功耗应用提供了五种灵活可设置的低功耗模式，可用于延长产品的待机时间。另外产品内部集成了BALUN电路，使天线设计也更加简单。此外，图形可视化的PSoCCreator软件给开发者提供了一个友好的、易操作的开发环境，可大大缩短开发者的开发周期，加快产品上市时间。

综上所述，CYPRESSPSoCBLE系列产品可以提供一个完美的心率监测仪解决方案，单芯片解决产品的应用，既满足了产品的实际需求，还可以节省开发成本和开发周期。

【PSoC® 4 BLE(蓝牙智能)】

Cypress offers Bluetooth Smart PSoC 4 to connect low power applications to smart phone or tablets.Today’s consumers expect their wireless devices to quickly and seamlessly connect and to perform just like wired ones provide at home, in the car and on the move.With Cypress’s products you can provide these key elements and universal connectively consumers look for in their smartphones or tablets.

Bluetooth Smart PSoC 4 BLE is a Arm® Cortex®-M0-based, PSoC device that integrates programmable analog front ends, programmable digital logic, industry-leading CapSense® user interface and a Bluetooth® Low Energy (Bluetooth Smart) radio.It includes a royalty-free BLE Protocol Stack compatible with Bluetooth 4.2.

New! Watch how-to make an an iOS App to control a robot using BLE

最新!PSoC 4 BLE devices are now in production with:

256 KB/128 KB Flash and 32 KB/16 KB SRAM

All new Bluetooth 4.2 features

Enhanced security with LE Secure Connections

Power-efficient privacy with LL Privacy 1.2

Up to 2.6x higher throughput with LE Data Length Extension

Direct Memory Access (DMA) to access SRAM without CPU intervention

Get started with Bluetooth 4.2 today!

Download PSoC Creator 3.3 SP1

Order a Bluetooth 4.2 compatible BLE Pioneer Kit (CY8CKIT-042-BLE-A)

Register for a free BLE hands-on workshop or watch the online video tutorial

All PSoC 4 BLE devices support Over-The-Air (OTA) Firmware Upgrade.Refer the OTA Firmware Upgrade Guide for details.

PSoC 4 BLE devices are available in:

Standard QFN packages with ample GPIOs for any application

Small-form factor chip scale packages (CSP) for space constrained applications

Ultra-thin chip scale package (CSP) for banking applications like secure credit cards

Extended industrial temperature range for industrial and lighting applications

套件：

CY8CKIT-042-BLE-A Bluetooth® Low Energy 4.2 Compliant Pioneer Kit:

The Bluetooth® Low Energy Pioneer Kit enables customers to evaluate and develop Bluetooth 4.2 compliant solutions using the PSoC® 4 BLE and PRoC™ BLE devices.

CySmart BLE 4.2 USB Dongle (CY5677):

A BLE-USB bridge featuring a Bluetooth 4.2-compliant PRoC™ BLE device to test and debug BLE designs using the CySmart BLE Test and Debug Utility

PSoC 4 BLE 256KB Module with Bluetooth 4.2 (CY8CKIT-143A):

A Bluetooth 4.2-compliant, RF certified PSoC 4 BLE 256KB development module with an onboard PCB antenna

Bluetooth® Low Energy Pioneer Kit (CY8CKIT-042-BLE):

An Arduino-compatible general purpose development kit

PSoC® 4 BLE Module (CY8CKIT-142):

An RF certified PSoC 4 BLE development module with an onboard PCB antenna

PSoC® 4 BLE SMA Module (CY8CKIT-141):

A PSoC 4 BLE development module with an SMA connector for external antennas and RF testers

CySmart USB Dongle (CY5670):

A BLE-USB bridge featuring PRoC™ BLE to test and debug BLE designs using the CySmart BLE Test and Debug Utility

PSoC 4 BLE 256KB Module (CY8CKIT-143):

An RF certified PSoC 4 BLE 256KB development module with an onboard PCB antenna