MAX30102 Pulse Oximeter Heart Rate Sensor Module

Product Description The MAX30102 Heart Rate Sensor Module is an integrated pulse oximetry and heart-rate monitor biosensor. It combines two internal LEDs (Red and Infrared), a photodetector, and low-noise electronics with Ambient Light Rejection. This module is a significant upgrade over the older MAX30100, featuring a higher 18-bit ADC resolution and an integrated glass cover to protect the optics and minimize external light interference. It is widely used in wearable technology, such as fitness trackers and medical monitoring prototypes, due to its ultra-low power consumption and tiny form factor.

Key Features

• Dual-Wavelength Sensing: Utilizes 660nm (Red) and 880nm (IR) light to calculate oxygen saturation (SpO2) and heart rate (BPM) via photoplethysmography (PPG).

• High-Precision 18-bit ADC: Provides maximum signal resolution and minimal noise, ensuring reliable biometric data even with weak pulses.

• 32-Sample FIFO Buffer: Internal memory stores data points, allowing the host microcontroller to sleep longer and reducing the frequency of interrupts.

• Integrated Temperature Sensor: Built-in sensor (±1°C accuracy) allows for temperature compensation during SpO2 calibration and heart rate measurement.

• Robust Motion Resilience: Designed with a high Signal-to-Noise Ratio (SNR) to filter out artifacts caused by minor movements during measurement.

Technical Details

• Integrated Optical Module: Tiny 5.6mm x 3.3mm package includes LEDs, photodetector, and optical elements in a single system-in-package.

• I2C Interface: Standard two-wire serial interface (SDA/SCL) compatible with most 3.3V and 5V microcontrollers.

• Programmable LED Current: Software-configurable pulse amplitude (0 to 50 mA) and pulse width (69 µs to 411 µs) for power optimization.

• Power Management: Features an ultra-low-power shutdown mode (0.7µA) where the power rails can stay active while the sensor is off.

• Ambient Light Cancellation: Proprietary circuitry eliminates up to 200µA of interference from sunlight or indoor lighting.

• On-board Regulation: Most modules include LDO regulators to provide the 1.8V required for the IC core and 3.3V for the LEDs.

• Logic Level Flexibility: Solder jumpers on the back often allow switching between 1.8V and 3.3V logic levels for different MCU architectures.

• High Sampling Rates: Fast data output capability up to 3200 samples per second for high-frequency analysis.

• Non-Invasive Measurement: Designed for use on thin-tissue areas like the fingertip, earlobe, or wrist.

• Interrupt Pin: Includes an active-low interrupt pin (INT) that triggers when FIFO data is ready or a heartbeat is detected.

• Library Support: Fully compatible with the popular "SparkFun MAX3010x" Arduino library for rapid development.

• FIFO Almost Full Alert: Can be programmed to alert the MCU when the buffer is nearly full to prevent data loss.

• Operating Range: Stable performance across a wide industrial temperature range (-40°C to +85°C).

• Hardware Robustness: The glass cover serves as a physical barrier against sweat, dust, and environmental contamination.

• Compact PCB: Typically mounted on a 14mm x 14mm breakout board, ideal for integration into smartwatches or finger-clip probes.