Susie Maestre

user Electronics Engineer

city Innovuze Solutions Inc.

  • Earlobe Heart Rate Sensor

  • Created: Aug 18, 2016

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In the fields of health and medical monitoring, wearable devices offer a promising solution nowadays. Heart rate tells a lot of information regarding the heart function and health of a person during both activity and rest. There are many innovations of semiconductors and integrated circuits that would make the development the wearable devices possible. This reference design delivers the promise of wearable devices to all developers. It is a low power, earlobe heart-rate monitor that features MAX30102 with integrated with red and IR LEDs for heart rate detection. This device detects heart rate on a person’s earlobe or other fleshy extremity.

This design utilizes MAX30102 heart rate sensor, MAX1921 step-down converter, and MAX14595 level translator. All these components are from Maxim Integrated. The MAX30102 is Photoplethysmography (PPG)-based heart rate sensor. This type of sensor uses a light-based technology to sense the rate of blood flow as controlled by the heart’s pumping action. This operates on a single 1.8V power supply and a separate 5.0V power supply for the internal LEDs. The step-down converter MAX1921 converts the 2V to 5.5V supply input and generates the 1.8V rail for the heart rate sensor. The MAX14595 level translator provides an interface between the heart rate sensor and the controller board, which generally uses a different logic level.

This design is ideal for wearable applications and may be stitched into fabric for immediate prototyping. This can be used with any microcontroller that has I2C interface. It can also be integrated in fitness assistant devices. The entire design operates at less than 5.5mW, which makes it ideal for low-power applications.



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