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Melexis’ Unique Temperature Sensor Used in Galaxy Watch5

Written by Stephen Vicinanza

Melexis’ unique temperature sensor is used in the Galaxy Watch5. The Melexis MLX90632 is a non-contact temperature sensor, that enables enhanced accuracy and accurate menstrual cycle tracking.

The sensor provides reliable and continuous temperature monitoring and offers a wider range of applications including sports and health, as well as medical devices.

Many companies have sensors that must make contact with the skin. This requires a tight touch of the watch to the skin for accurate data gathering. In the real world, this is often a difficult situation to achieve and often leads to potentially unreliable data. Samsung solved this problem for its Galaxy Watch5 by utilizing Melexis’s contactless temperature sensor.

The Melexis contactless temperature sensor uses infrared to measure ambient and object temperature externally. Based on the calibration constraints and measurement data.

“We are excited that our infrared temperature sensor helps Samsung open up a world of new possibilities”, Damien Macq, Vice President of Sense & Light Business Unit at Melexis.  “We miniaturized the MLX90632 for integration within wearable health devices. The Galaxy Watch5 series is the first mass-market smartwatch to provide built-in, accurate, non-contact temperature measurement for personal health monitoring. We are making accurate skin thermometry the next go-to feature in this marketplace.

The Melexis solution has many key features.

  • Easy to integrate
  • factory calibrated
  • 3mmx3mm footprint
  • external ambient and object temperature calculation
  • Medical measurement resolution 0.01℃
  • Standard measurement resolution 0.02℃
  • Software-definable I2C address with 1LSB bit external address pin
  • I2C compatible digital interface
  • supply voltage of 3.3V – 1mA supply current and sleep current less than 2.5uA
  • Field of view 50 degrees
  • Default refresh rate of 0.5s, and configurable to between 16ms and 2s
  • Integrated post-calibration option

To find out more about the Melexis contactless MLX90632 infrared temperature sensor please visit the Melexis product page here.

See the datasheet on the MLX90632 here.

Melexis |

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For the past 8 years, I have been writing about embedded technologies, added to my technical, academic, and medical editorial experience, with companies like Elsevier and Cambridge University Press. I tell people to read what I write, not try to pronounce my last name. I am always available for comments and suggestions you can reach me at and I promise I will take the time to reach back out to you. I live in the North East with my wonderful family.

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Melexis’ Unique Temperature Sensor Used in Galaxy Watch5

by Stephen Vicinanza time to read: 1 min