MAX30102 Pulse Oximeter and Heart-Rate Sensor

MAX30102 Pulse Oximeter and Heart-Rate Sensor Module is a complete solution for monitoring critical vital signs, integrating both a pulse oximetry and heart rate monitoring system into a tiny, low-power package. This high-performance sensor combines two LEDs—red and infrared—a photodetector, optimized optics, and low-noise analog signal processing. By measuring the changes in light absorption through a fingertip or earlobe, the MAX30102 accurately detects the user’s heart rate and the level of oxygen saturation in the blood (SpO₂). Designers rely on this module for creating small, wearable health devices due to its remarkable power efficiency, excellent immunity to ambient light, and simple I²C interface, making it a powerful tool for consumer, fitness, and medical monitoring projects.

Key Features:

• Integrated Solution: Combines red LED, infrared LED, photo-sensor, and advanced analog front-end for complete vital sign acquisition.
• Ultra-Low Power: Optimized for use in wearable devices, featuring a shutdown mode that draws minimal current to extend battery life significantly.
• I²C Digital Interface: Allows easy communication with any microcontroller using a standard two-wire protocol, simplifying data retrieval.
• High Sensitivity: Optimized signal processing enables reliable readings even with low perfusion (poor blood flow) or motion artifacts.
• On-Chip Temperature Sensor: Provides ambient temperature measurement, assisting in calibration and compensation for more accurate readings.

Technical Specifications:

• Supply Voltage (V_DD): 1.8 V to 5.0 V
• LED Operating Voltage (V_LED): 3.3 V or 5.0 V (Usually connected to V_DD)
• Interface: I²C Communication Protocol
• LED Wavelengths: Red (≈ 660 nm) and Infrared (IR ≈ 880 nm)
• Data Output: 16-bit A/D Converter output
• Max Sample Rate: Up to 3.2 kSps (kilo Samples per Second)

Mechanical Specifications:

• Form Factor: Small PCB module with surface-mount components.
• Mounting: Pin headers for through-hole mounting or soldering onto prototype boards.
• Protection: Integrated cover glass for optimal, non-contact signal detection and easy cleaning.

Dimensions:

• Module Length: ≈ 12.0 mm
• Module Width: ≈ 8.0 mm
• Pin Pitch: 2.54 mm (0.1 inch standard)
• Weight: ≈ 1 g (Extremely lightweight)

Pinout and Wiring:

• V_CC/V_DD: Main power supply input (1.8 V to 5.0 V).
• GND: Ground reference for the power supply and data.
• SDA: Serial Data line for the I²C bus. Connect to the microcontroller’s SDA pin.
• SCL: Serial Clock line for the I²C bus. Connect to the microcontroller’s SCL pin.
• INT: Interrupt output pin. Active-low pin used to alert the microcontroller when new data is ready.
• RD: Red LED power pin (Often connected to V_CC or a separate 3.3V/5V rail).
• IR: Infrared LED power pin (Often connected to V_CC or a separate 3.3V/5V rail).
• Wiring Note: You must connect pull-up resistors (typically 4.7 kΩ) on the SDA and SCL lines for reliable I²C communication.

Datasheet Reference:

• Download Datasheet

Commonly Used in:

• DIY Health Trackers: Building custom wristbands and rings for fitness monitoring.
• Wearable Medical Prototypes: Developing low-cost, portable diagnostic devices.
• Home Automation Systems: Integrating presence detection and basic health data into smart homes.

Applications:

• Heart Rate Monitoring: Measuring pulse beats per minute (BPM) reliably during rest and activity.
• Pulse Oximetry (SpO₂): Determining the oxygen saturation level in a user’s blood.
• Motion Sensing: Using the data stream to detect involuntary body movement for data integrity analysis.

Equivalent Models:

• MAX30100: The predecessor, which is slightly larger and lacks some of the low-power and advanced noise suppression features of the MAX30102.
• ADPD188: An alternative integrated optical module from Analog Devices for bio-sensing.

Package Includes:

• 1 x MAX30102 Pulse Oximeter and Heart-Rate Sensor Module