MLX75030CLQ-AAA-000-SP

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The MLX75030CLQ-AAA-000-SP is sold by Melexis as an infrared (IR) emitter and detector subassembly. The integrated device includes an infrared emitter (IRED), a thermopile detector and a signal conditioning IC, all in one package. This subassembly is ideal for applications requiring temperature sensing as well as thermal gesture recognition, such as IoT and smart homes.

The MLX75030CLQ-AAA-000-SP’s application field is diverse, including body temperature monitoring, automatic and robotic gesture recognition, advanced air-conditioning control and even display applications. This IR subassembly provides accurate thermal sensing capabilities for the IoT, enabling advanced user queries in smart homes and smart retail applications, for example.

The IR emitter operates at 940nm, and it is modulated at a frequency of 1.7MHz. The thermopile detector consists of a six-element array of thermocouples, which detect the temperature of the object upon which the IR beam is reflected. Furthermore, the signal conditioning IC provides the necessary analogue-digital conversion and I2C-compatible interface.

As the 940nm wavelength is outside the spectrum visible to humans, the MLX75030CLQ-AAA-000-SP enables precise measurements with improved accuracy because it is not affected by room illumination or shadowing effects. This subassembly is ideal for applications requiring temperature sensing as well as thermal gesture recognition, such as IoT and smart homes.

The MLX75030CLQ-AAA-000-SP device has a range of working principles depending on the required application. In body temperature measurement applications, the thermopile detector is exposed to the human body, which radiates energy in the form of infrared waves which are then captured by the IR emitter. The device then uses the magnitude of the IR energy to estimate the temperature of the human body. Gesture recognition applications use the same principle, but the thermopile detector is exposed to the gesture of the user, which will generate a certain magnitude of IR energy, depending on the configuration of the gesture.

In air-conditioning applications, the device is exposed to the air, where the thermopile detector will detect the air temperature, the humidity and the wind speed of the air by measuring a magnitude of the thermal energy of the air. The device will then use this information to adjust the cooling settings automatically.

Finally, this MLX75030CLQ-AAA-000-SP device can also be used in touchless displays. In this application, the device detects hand motions within the detection range and interprets them as touchscreen input. This eliminates the need for external hardware like joysticks or buttons.

To summarize, the MLX75030CLQ-AAA-000-SP is an integrated IR emitter and thermopile detector subassembly which is used in a variety of applications such as body temperature monitoring, gesture recognition, air-conditioning control and touchless displays. This device operates at 940nm and is modulated at 1.7MHz, allowing it to measure thermal energy accurately and with no interference from visible light. Furthermore, depending on the application, the thermopile detector is exposed to the human body, gesture, air or a display, and the device uses this information to estimate the temperature of the body, interpret the gesture, adjust air-conditioning settings or interpret the gesture as touchscreen input.

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