TIDA-010029

Wearable, 16-phase multi-sensor SpO2 and heart rate monitor (HRM) reference design with Bluetooth® 5

TIDA-010029

Design files

Overview

This reference design enables a wearable, optimized saturation of peripheral capillary oxygen (SpO2) and multi-sensor, multi-wavelength optical heart rate monitor (HRM). It uses AFE4420 device, which is a single-chip, bio-sensing front end for photoplethysmography (PPG) measurements. It supports up to four switching light-emitting diodes (LEDs) and up to four photodiodes to enable signal acquisition of up to 16 Phases. The CC2640R2F device (supporting Bluetooth® low energy 4.2 and 5) transfers the measured data to a remote location. This patient-monitoring design uses a single CR3032 battery with a 30-day life cycle. Raw data is available to calculate heart rate, SpO2, and other related parameters. 2 onboard light-emitting diodes (LEDs) identify low-battery detection and a Bluetooth connection.

Features
  • Provides raw data to calculate heart rate, SpO2, and other related parameters
  • Uses single-chip, bio-sensing, front-end AFE4420 device for PPG measurement
    • Supports up to 4 LEDs and 4 photodiodes with ambient subtraction to improve signal-to-noise ratio (SNR)
    • Enables signal acquisition of up to 16 phases and multi-wavelength measurements with the flexible allocation of LEDs and photodiodes in each phase
  • Integrated Arm® Cortex®-M3 and 2.4-GHz RF transceiver (CC2640R2F) supports wireless data transfer through Bluetooth® low energy 4.2 and 5.0
  • Operates from CR3032 (3-V, 500-mA coin cell battery) with a battery life of 30 days using highly efficient DC/DC converters
  • Small form factor helps in easy adaption to wearable applications

Design files & products

Design files

Download ready-to-use system files to speed your design process.

TIDUEG6A.PDF (7438 K)

Reference design overview and verified performance test data

TIDRXA9.ZIP (450 K)

Detailed schematic diagram for design layout and components

TIDRXB0.ZIP (139 K)

Complete listing of design components, reference designators, and manufacturers/part numbers

TIDRXB1.ZIP (230 K)

Detailed overview of design layout for component placement

TIDRXB3.ZIP (2741 K)

Files used for 3D models or 2D drawings of IC components

TIDCEX6.ZIP (531 K)

Design file that contains information on physical board layer of design PCB

TIDRXB2.ZIP (848 K)

PCB layer plot file used for generating PCB design layout

Products

Includes TI products in the design and potential alternatives.

Biosensing AFEs

AFE4420Ultra-small integrated AFE with FIFO for multisensor wearable optical heart-rate monitoring

Data sheet: PDF | HTML
Bluetooth products

CC2640R2FSimpleLink™ 32-bit Arm® Cortex®-M3 Bluetooth® 5.1 Low Energy wireless MCU with 128-kB flash

Data sheet: PDF
Boost converters (integrated switch)

TPS610990.7Vin Synchronous Boost Converter with 800 nA Ultra-Low Quiescent Current

Data sheet: PDF | HTML
Buck-boost, inverting & split-rail converters (integrated switch)

TPS63036High Efficient Single Inductor Buck-Boost Converter with 1-A Switches

Data sheet: PDF | HTML
Buck-boost, inverting & split-rail converters (integrated switch)

TPS639001.8-V to 5.5-V, 75-nA IQ buck-boost converter with input current limit and Dynamic Voltage Scaling

Data sheet: PDF | HTML

Start development

Software

Firmware

TIDA-010029 Firmware — TIDCEX7.ZIP (17851 K)

lock = Requires export approval (1 minute)
Support software

TIDA-010029 LabView Application — TIDCEX8.ZIP (44149 K)

lock = Requires export approval (1 minute)

Technical documentation

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Type Title Date
* Design guide Wearable, 16-phase multi-sensor SpO2 and HRM ref design with Bluetooth® 5 (Rev. A) Mar. 17, 2019
Technical article Going beyond traditional SpO2 measurement with multiwavelength optical measurements Feb. 12, 2019
Application note Measuring CC13xx and CC26xx current consumption (Rev. D) PDF | HTML Jan. 10, 2019
More literature TIDA-010029 Firmware Oct. 23, 2018
Application note How to Design an SpO2 and OHRM System Using AFE4403 Mar. 02, 2015

Related design resources

Hardware development

DEVELOPMENT KIT
LAUNCHXL-CC2640R2 SimpleLink™ Bluetooth® Low Energy CC2640R2 wireless MCU LaunchPad™ development kit

Reference designs

REFERENCE DESIGN
TIDA-010043 Efficient, high-current, linear LED driver reference design for SpO2 and other medical applications TIDA-01580 Wireless ECG, SpO2, PTT and heart rate monitor reference design for medical and consumer wearables

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