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A pulse oximeter is a non-invasive electro-optical device for measuring both the heart rate and the degree to which the hemoglobin in one’s blood has been saturated with oxygen. This quantity is inferred by measuring the optical transmittance of perfused skin in different wavelengths of light. Red, green and infrared LEDs are convenient and common light sources. Blood oxygen saturation can be determined by comparing the values of Oxy-hemoglobin to Deoxy-hemoglobin. One method for doing this is by shining both a red LED and an infrared LED into a body part (such as a finger or wrist) and then measuring and comparing the relative intensities of the light from each LED in terms of a ratio. This ratio is then typically expressed as the percentage of oxygen saturation.

Pulse oximeter designs call for low power consumption and extensive analog and digital filtering. They are often implemented both as stand-alone medical and fitness devices as well as components of more comprehensive vital sign monitoring systems.

Pulse Oximeter Demo Design  Files

Pulse Oximeter Demo Design Files

Check out the design files for a low cost, high-performance pulse oximeter demo.

Single-Chip Wearable Heart Rate Monitor Demo Design Files

Check out the design files for a single-chip, wearable heart rate demo.

System Diagram

We Have What Pulse Oximeter Designers Need

  • Our dsPIC® Digital Signal Controllers (DSCs) provide high-performance digital filtering of optical noise from external light sources and movement
  • Lower cost of development with our world-class MPLAB® X Integrated Development Environment (IDE), which encapsulates coding, debugging, software simulation, hardware emulation and device programming in a single interface
  • Low-offset, low-noise op amps for amplification and conditioning of photodiode output
  • Agency-certified Bluetooth®, Bluetooth Smart and Wi-Fi® modules for fast integration with existing wireless networks



Examples – Microcontrollers with:
Integrated op amps, ADCs, LCD, touch channels, Core Independent Peripherals and eXtreme Low Power (XLP)/picoPower® technology

Signal Conditioning and Power Management

Examples – Op amps, instrumentation amplifiers, battery management, switching regulators and Low-Dropout (LDO) regulators


Examples – Bluetooth®, Bluetooth Low Energy and Wi-Fi®

Other Products

Examples – Memory, USB, Ethernet, data and video transceivers

Application Notes

Title Download
AN951 - Amplifying High-Impedance Sensors - Photodiode Example Download
AN1906 - Bluetooth Low Energy Digital Pedometer Demo Design Download
AN1661 - Sensor Calibration on SSC7102 Bosch Sensor Fusion Solution for Windows 8 Download
AN1525 - Pulse Oximeter Design Using Microchip's Analog Devices and dsPIC Digital Signal Controllers (DSCs) Download
AN1494 - Using MCP6491 Op Amps for Photodetection Applications Download
AN1260 - Li-Ion/Li-Poly Battery Charge and System Load Sharing Management Design Guide With MCP73871 Download
AN1416 - Low-Power Design Guide Download
TB1098 - Low-Power Techniques for LCD Applications Download
AT14973: Wearable Demo Reference Design Download
AN990 - Analog Sensor Conditioning Circuits - An Overview Download

Medical Video Channel

Pulse Oximeter