Multi-function MEMS sensor includes integrated gas sensor

January 06, 2015 // By Graham Prophet
This environmental sensor from Bosch Sensortec combines pressure, humidity, temperature and indoor air quality measurement parameters. You can use it to equip mobile devices and wearables with indoor air quality measurement, with its low power consumption and small package

BME680 integrates a gas sensor with full-specifications air pressure, humidity and ambient air temperature sensing functions in a single 3.0 x 3.0 mm footprint. The environmental sensor enables new capabilities for portable and mobile devices such as air quality measurement, personalised weather stations, indoor navigation, fitness monitoring, and home automation.

The gas sensor within the BME680 can detect a broad range of gases in order to measure indoor air quality for personal well-being, including Volatile Organic Compounds (VOC) from paints (such as formaldehyde), lacquers, paint strippers, cleaning supplies, furnishings, office equipment, glues, adhesives and alcohol.

With its combination of four sensors in one package, the BME680 provides the accurate, detailed real-world data required for many IoT applications. Expected uses include smart homes, smart offices and buildings, smart energy, smart transportation, HVAC, elderly care and sport/fitness applications.

The BME680 builds on Bosch Sensortec's existing BME280 environmental sensor module. By integrating a new gas sensor, the BME680 delivers superior environmental measurement performance, made possible by the internal compensation and calibration of the gas, pressure, temperature and humidity sensors. The gas sensor can detect Volatile Organic Compounds (VOCs) down to the ppm range.

Pressure accuracy of ±0.12 Pa provides altitude information to ±1m, suiting it for applications such as indoor navigation with floor level tracking. Fast response time for measurement of humidity and ambient temperature enables new applications such as personalised weather information and air quality monitoring.

An offset temperature coefficient of 1.5 Pa/K enables altitude stability over temperature of 12.6 cm/K. This is important in applications requiring the user’s vertical position within a building over a wide range of ambient temperatures.

The BME680 is equipped with both I²C and SPI communication interfaces. Three power modes and oversampling rates for pressure and temperature measurements that can be configured separately help designers to easily adapt the BME680 to different applications. An integrated IIR filter eliminates short-term measurement fluctuations caused by potential environmental influences. Proven