SB220

The SB220 is a monolithic PPG sensor that enables high-fidelity PPG signal sensing with an ultra-low power consumption.

Characteristics

  • Photosensitive pixel array (128×128 pixels)
  • Analog Front-End (AFE) for PPG applications
  • Integrated analogue-domain ambient light cancellation
  • Analog-to-Digital Conversion (ADC) with variable resolution
  • 2 multiplexed LED drivers for applications such as oximetry
  • Fully programmable through 1 MHz SPI interface
  • 20 µA consumption
  • High quantum efficiency (QE) of >80%
  • Multiple Clocking options
  • Flexible sampling rate with predefined frequencies and sample-on-trigger option
  • Programmable analogue gain
  • Programmable ADC resolution of 12/14 bits
  • Programmable LED pulse width, drive current, and multiplexing scheme
  • Programmable FIFO depth of 64/128 words

As different light wavelengths are required depending the application, the SB220 has a high QE over a large spectrum

Applications

Measure of Heart rate, Blood oximetry (SpO2), Inter-beat interval, Heart Rate Variability, Respiration Rate and Blood Pressure to be used in:

  • Hearing aids
  • Earbuds
  • Smart rings
  • Wrist fitness and activity monitors
  • Smartwatches
  • Smartphones

Evaluation Kit

SB220 EVK BLE

  • Measuring PPG on the finger
  • 5.9 x 6.9 mm² PPG module, with
    • 1x large format PPG sensor (2,4 x 2,4 mm²)
    • 1x red + green LEDs
  • SPI-USB interface adaptor with 2 LDOs for 1.8V supply and 2.4V ADC reference.
  • SPI-USB cable (FTDI), with
    • 4 wires SPI
    • FIFO-full signal handling
    • Reset control
    • 3,3V-GND
  • Software for the module settings, data acquisition and processing

Demonstrators

In order to facilitate evaluating the SB220 PPG sensor in real conditions, different demonstrators are available for different body positions:

  • On fingers
  • On the tragus and the antitragus (concha)

Ring SBF2200

Earbud SBE2200

Software

To easily configure and monitor our PPG sensor on our evaluation kit and demonstrators, we have developed a friendly application for Windows 10. The application allows to fully configure the sensor, visualise and record the PPG signal in real-time.