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Infineon XENSIV PAS CO2 sensor

Apr 27 2022 2022-04 Semiconductors Infineon Technologies
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Infineon's XENSIV™ PAS CO2 sensor. Based on the principle of photoacoustic spectroscopy (PAS), the product uses a high-sensitivity MEMS microphone to detect pressure changes generated by CO2 molecules in the sensor cavity. The sensor integrates a photoacoustic sensor (including detector, IR source, and optical filter), a microcontroller for signal processing and algorithms, and a MOSFET for driving the IR source

     Infineon's XENSIV™ PAS CO2 sensor. Based on the principle of photoacoustic spectroscopy (PAS), the product uses a high-sensitivity MEMS microphone to detect pressure changes generated by CO2 molecules in the sensor cavity. This detection method can significantly reduce the size of the CO2 sensor, which can save more than 75% space in the final product compared to other CO2 sensors on the market.

     The Infineon XENSIV PAS CO2 sensor integrates a photoacoustic sensor (including detector, infrared source and optical filter), a microcontroller for signal processing and algorithms, and a MOSFET for driving the infrared source. Among them, the integrated microcontroller converts the output of the MEMS microphone into ppm readings and provides these readings through a serial I²C, UART or PWM interface. The sensor has a measurement range from 0ppm to 10000ppm with an accuracy of ±30ppm or ±3% of reading.

      Because the sensor provides direct-read ppm readings, is surface mountable, and has a simple design, it can be quickly integrated into a variety of low- and high-volume applications, such as smart home and building automation designs, demand-controlled ventilation systems, air purifiers, thermostats, weather stations and personal assistants.

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