MAX30102 High-Sensitivity Pulse Oximeter and Heart Rate Sensor
Integrated Biosensor Module for Wearable Health and Fitness Applications
The MAX30102 is a complete, integrated biosensor module from Analog Devices that combines pulse oximetry (SpO2) and heart rate (HR) monitoring in a single, tiny package. It integrates internal LEDs, photodetectors, optical elements, and low-noise electronics with ambient light rejection, making it a popular choice for wearable devices and fitness applications.
Integrated Heart Rate + SpO2 - Measures both pulse and blood oxygen saturation in one module.
UltraLow Power Design Operates with a lowpower heartrate monitor (<1mW) and ultra-low shutdown current (0.7µA typical).
Communication is via a standard I2C-compatible interface. The internal LEDs are powered separately from the core logic.
The module is incredibly tiny, measuring just 5.6mm x 3.3mm x 1.55mm in a 14-pin optical module.
This sensor shines both red (660nm) and infrared (880nm) light onto the skin and uses a photodetector to measure the reflected light, calculating heart rate and SpO2 from the changing light absorption of pulsating arterial blood.
Key Specifications
| Parameter | Value |
|---|
| Operating Voltage | 1.8V (core) / 3.3V - 5V (module) |
| LED Wavelengths | Red: 660nm, IR: 880nm |
| ADC Resolution | 15 to 18-bits (programmable) |
| Sampling Rate | 50 - 3200 sps (programmable) |
| Communication | I2C Interface (Write Address 0xAE / Read Address 0xAF) |
| Operating Temp | -40°C to +85°C |
= Applications =
- Wearable devices (smartwatches, fitness trackers).
- Fitness assistant devices and health monitoring.
- Medical monitoring equipment.
- Sleep monitoring devices.
High Sensitivity & Motion Artifact Resilience - Offers reliable performance with robust noise suppression.
WellSupported Ecosystem Extensive Arduino and ESP32 libraries, and many project examples available online.
√ Commonly available as a compact breakout board with a 5-pin header.
√ Optimized for reading PPG (Photoplethysmogram) signals from fingertips, earlobes, or wrists.
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