Mouser Electronics now stocks the XENSIV PAS CO2 carbon dioxide sensor from Infineon Technologies. Based on PAS, the sensor uses a high-sensitivity MEMS microphone to detect the pressure change generated by CO2 molecules within the sensor cavity. The result is a remarkably miniaturised CO2 sensor that provides space savings of more than 75% in end products compared to other CO2 sensors available.
The sensor integrates a photoacoustic transducer, including a detector, infrared source, and optical filter, plus a microcontroller for signal processing and algorithms and a MOSFET to drive the infrared source. The integrated microcontroller converts the MEMS microphone output into a ppm reading, which is offered via the serial I²C, UART or PWM interface. The sensor measures a range from 0ppm to 10,000ppm with an accuracy of ±30ppm or ±3% of the reading.
The sensor’s direct ppm readings, surface mounting capability, and simple design provide fast integration into low- and high-volume applications, including smart home and building automation designs, air purifiers, thermostats, demand-controlled ventilation, weather stations, and personal assistants.