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TIDA-010029

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

Design files

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
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A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Design files & products

Design files

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

download Design guide — TIDA-010029
TIDUEG6A.PDF (7438 K)

Reference design overview and verified performance test data

download Schematic — TIDA-010029
TIDRXA9.ZIP (450 K)

Detailed schematic diagram for design layout and components

download Bill of materials (BOM) — TIDA-010029
TIDRXB0.ZIP (139 K)

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

download Assembly drawing — TIDA-010029
TIDRXB1.ZIP (230 K)

Detailed overview of design layout for component placement

download CAD/CAE symbol — TIDA-010029
TIDRXB3.ZIP (2741 K)

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

download Gerber file — TIDA-010029
TIDCEX6.ZIP (531 K)

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

download PCB layout — TIDA-010029
TIDRXB2.ZIP (848 K)

PCB layer plot file used for generating PCB design layout

Products

Includes TI products in the design and potential alternatives.

AC/DC & DC/DC converters (integrated FET)

TPS61099 — 0.7Vin Synchronous Boost Converter with 800 nA Ultra-Low Quiescent Current

Data sheet: PDF | HTML
AC/DC & DC/DC converters (integrated FET)

TPS63036 — High Efficient Single Inductor Buck-Boost Converter with 1-A Switches

Data sheet: PDF | HTML
AC/DC & DC/DC converters (integrated FET)

TPS63900 — 1.8-V to 5.5-V, 75-nA IQ buck-boost converter with input current limit and Dynamic Voltage Scaling

Data sheet: PDF | HTML
AC/DC & DC/DC converters (integrated FET)

TPS63901 — 5.5-V buck-boost converter with 75-nA operating IQ in WCSP package

Data sheet: PDF | HTML
Biosensing AFEs

AFE4420 — Ultra-small integrated AFE with FIFO for multisensor wearable optical heart-rate monitoring

Data sheet: PDF | HTML
Low-power 2.4-GHz products

CC2640R2F — SimpleLink™ 32-bit Arm® Cortex®-M3 Bluetooth® 5.1 Low Energy wireless MCU with 128-kB flash

Data sheet: PDF

Start development

Software

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 measurement PDF | HTML Feb. 12, 2019
Application note Measuring CC13xx and CC26xx current consumption (Rev. D) PDF | HTML Jan. 10, 2019
Application note How to Design an SpO2 and OHRM System Using AFE4403 Mar. 02, 2015

Related design resources

Hardware development

EVALUATION BOARD
LAUNCHXL-CC2640R2 — CC2640R2 LaunchPad™ development kit for SimpleLink™ Bluetooth® Low Energy wireless MCU

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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