Miniature sensor for good air: Page 4 of 4

December 03, 2019 //By Hicham Riffi
The CO2 concentration is a key indicator of the quality of the indoor air. Good air means less drowsiness and more productivity, while too high a concentration of CO2 indoor means poor air quality, often due to inadequate air conditioning and air recirculation. This can lead to health issues including the well-documented sick building syndrome (SBS) towards which other indoor toxins can contribute, such as fine dust, mould, pollen, germs or even asbestos.

Features and advantages

Infineon's new Xensiv PAS CO2 sensor features the IM69D130 Xensiv MEMS microphone with a signal-to-noise ratio of 69 dB. It is designed for applications where low self-noise, wide dynamic range, low distortion, and high acoustic overload point are required. Thanks to the IM69D130, the slightest pressure fluctuations can be measured in the gas sensor, so that even a small amount of gas is sufficient for the exact determination of the gas concentration. As a result, the sampling chamber could also be designed small. Offering true CO2 measurements, the new sensor is more than 75 % smaller than conventional CO2 sensors with comparable performance parameters. The integrated microcontroller converts the signal at the MEMS microphone output into a ppm value that is available via three interfaces: the serial I²C, UART or PWM interface. The direct ppm readings, surface mount capability and simple design allow easy and fast integration with flexible production numbers. All components are designed and produced in-house to Infineon's high quality standards.

The extremely robust sensor covers a measuring range from 0 ppm to 10,000 ppm with a measurement accuracy in the range up to 5000 ppm (± 3 %) at ± 30 ppm. It operates in a temperature range from 0°C to 50°C at a relative humidity of 0 % to 85 % (non-condensing). Drift is less than 1 % per year (with active self-calibration). In pulsed mode, the CO2 sensor is designed to last ten years. This makes the Xensiv PAS CO2 ideal for demand-oriented ventilation control in building automation and for controlling indoor air quality in smart home applications.

Typical applications of the Xensiv PAS CO2 sensor.

Infineon is planning several sensor variants to meet very specific requirements in various applications, such as low power consumption in battery-powered applications, smaller size at lower cost for portable devices, and even more reliable variants for extremely harsh industrial applications. Sensor variants for other gases are on the roadmap too.


About the Author
Hicham Riffi is Senior Manager for Product Marketing Environmental Sensors at Infineon Technologies –

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