Digital CMOS gas sensors for wearables & IoT

Digital CMOS gas sensors for wearables & IoT

Feature articles |
Cambridge CMOS Sensors' digital gas sensor, CCS811, simplifies the development process for integrating gas sensor solutions into smart phones, wearables and connected home devices
By eeNews Europe


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 I²C 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 and processes raw sensor data during gas detection using intelligent detection algorithms to represent equivalent CO2 (eCO2) level or TVOC measurement in real world environments, where the main cause of VOCs is from humans. This on-boarding processing reduces the overall system power consumption and processing required on the host system.

The sensor has a standard I²C digital interface compatible with application processors, and provides a highly integrated solution. Compared to using separate gas sensor and microcontroller chips, which typically require two or more additional components, CCS811 can save on the device’s bill of materials (BOM) and up to 60% on the board footprint.

The CCS811 is sampling in a 10 lead 2.7 x 4.0 mm, 0.6 mm pitch LGA package suited for space constrained portable applications, for $5.82 (10,000).

Evaluation kits are available now for CCS811 with Windows based software for sensor measurements and logging results.

Cambridge CMOS Sensors;

Linked Articles
eeNews Embedded