Digital CMOS gas sensors for wearables & IoT

November 05, 2015 // By Graham Prophet
Cambridge CMOS Sensors' digital gas sensor, CCS811, simplifies the development process for integrating gas sensor solutions into smart phones, wearables and connected home devices

Cambridge CMOS Sensors is a semiconductor company that designs gas sensor solutions to monitor the local environment; its CCS811 is the first digital product in its CCS800 product family of ultra-low power miniature gas sensors.

The CCS811 integrates a metal oxide gas sensor with a microcontroller sub-system which enables Indoor Air Quality Monitoring, ease of design, extended battery life and reduced system cost for smartphones, wearables and connected home devices. It is based on CCS’s Micro-hotplate technology which enables a highly reliable solution for gas sensors, very fast cycle times and a significant reduction in average power consumption compared with traditional metal oxide gas sensors.

Features include:

· Integrated MCU – manages sensor drive modes and measurements while detecting VOCs (volatile organic compounds)

· On-board processing – provides eCO2 level or TVOC indication with no host intervention

· Standard digital interface – simplifies the hardware and software integration

· Optimised low-power modes – extend battery life in portable applications

· 2.7 x 4.0 mm LGA package – for small form-factor designs

· Low component count – saves up to 60% in PCB footprint

· Proven technology platform – designed for high volume and reliability (>5year lifetime)

CCS811functions include; a metal oxide (MOX) gas sensor, a microcontroller, an analogue-to-digital converter (ADC) and a I ²C digital interface, all in a 2.7 x 4.0 mm, 0.6mm LGA package suitable for low cost PCB technology. It can be used for detecting Ethanol (Alcohol) and hazardous gases such as Carbon Monoxide (CO) and a wide range of Volatile Organic Compounds (VOCs), based on its Micro-hotplate technology. This unique technology significantly reduces power consumption through very fast cycle and measurement times.

CCS811 supports multiple measurement modes which have been optimised for low-power consuming <1.2 mW on average during active sensor measurement per minute and <6 µW in idle mode. The device supports an integrated MCU that manages the sensor drive modes, ADC measurements