TLE4964-2M datasheet(78/91 Pages) INFINEON

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Environmental sensor

PAS CO2

High performance in a small size – Introducing a disruptive

CO2 sensor based on photoacoustic spectroscopy (PAS)

The PAS (photoacoustic spectroscopy) principle:

The sensor is characterized by a disruptive measurement principle called PAS (photoacoustic spectroscopy). It works as

follows: pulses of infrared light pass through an optical filter tuned to the CO2 absorption wavelength. The CO2 molecules

absorb the filtered light, causing them to shake and generate a pressure wave with each pulse. This is called the photo-

acoustic effect. The sound is then detected by an acoustic detector optimized for low frequency operation and converted

to a CO2 concentration reading by the microcontroller.

Applications

› HVAC (Heating, Ventilation and Air Conditioning) systems

› Smart home appliances such as air purifiers, air conditioners and thermostats

› Consumer devices for air quality monitoring such as

personal assistants and CO2 traffic lights

› Smart indoor lighting

Features and benefits

Features

› Exceptionally small form factor (14 x 13.8 x 7.5 mm3)

› High accuracy (±30 ppm ±3% of reading)

› SMD package delivered in tape and reel

› Advanced compensation and self-calibration algorithms

› Various configuration options (e.g. sampling rate,

baseline calibration) and interfaces (UART, I2C, PWM)

Benefits

› Space savings in customers’ end products

› High-quality data and compliance with smart

building standards

› Cost-effective high-volume assembly and easy

system integration

› Plug & play for fast design-to-market

› Customer flexibility thanks to configuration options

TLE4964-2M датащи(PDF) 78 Page - Infineon Technologies AG