High-sensitivity pulse oximeter and heart-rate sensor for wearables

July 04, 2016 // By Graham Prophet
Maxim Integrated has posted details of the the MAX30101, an integrated, reflective optical, pulse oximetry and heart-rate monitor module. It includes internal LEDs, photodetectors, optical elements, and low-noise electronics with ambient light rejection.

The MAX30101 provides a complete system solution to ease the design-in process for mobile and wearable devices. In common with other devices designed to make trans-cutaneous measuremetns of blood and blood flow, it has red, infra-red and green emitters (LEDs); Maxim employs a single visible-plus-infrared sensing channel. The device operates on a single 1.8V power supply and a separate 5.0V power supply for the internal LEDs. Communication is through a standard I ²C-compatible interface. The module can be shut down through software with zero standby current, allowing the power rails to remain powered at all times.


Features include;

- 5.6 × 3.3 × 1.55 mm 14-pin optical module

- Integrated cover glass for optimal, robust performance

- Ultra-low power operation for mobile devices

- Programmable sample rate and LED current for power savings

- Low-power heart-rate monitor (< 1 mW)

- Ultra-low shutdown current (0.7 μA, typ)

- Fast data output capability, & high sample rates

- Robust motion artifact resilience & high SNR

- -40°C to +85°C operating temperature range


Maxim; www.maximintegrated.com/en/products/analog/sensors-and-sensor-interface/MAX30101