SMI (Silicon Microstructures, Inc.) introduces the SM933X Series of ultra low MEMS pressure sensor systems. The fully temperature compensated and pressure calibrated sensor with pressure ranges as low as 125 Pa (0.50 inH2O) enables precise pressure sensing in HVAC, industrial and medical applications. Industry leading output accuracy (1% FS) and long term stability is achieved by combining SMI’s proprietary MEMS pressure transducer with a state-of-the-art signal-conditioning IC in one package.
The differential pressure sensor system is available in two configurations: SM9333, with a pressure range of +/- 125 Pa (0.50 inH2O), and SM9336, with a pressure range of +/- 250 Pa (1 inH2O). The total accuracy after board mount and system level Autozero is less than 1%FS over the full compensated temperature range of -20 to 85ºC. The 16 bit resolution provides the ability to resolve signals as small as 0.0038 Pa. The excellent warm-up behavior and long term stability further assures its expected performance over the life of the part.
The system supply ranges from 3.0 to 5.5V and it is well suited for low power applications with its low current consumption and available sleep mode. The ASIC architecture and higher order noise filtering provides low noise and extremely low EMI susceptibility.
The small SO16 package with dual vertical port allows for easy system integration and pressure connection, while the MEMS sensor itself is robust with high burst pressure and virtually no mounting or vibration sensitivity.
Key applications: HVAC, CPAP and pressure transmitters
The SM933X is the best solution for flow sensing applications, delivering high performance regardless of the tubing length and is not affected by particles in the airflow. It is versatilely applicable as an HVAC sensor, to determine the air flow in variable air volume (VAV) systems and detection of filter cleanliness in eg. air handling units (AHU).
In the medical market ultra low pressure sensors are used for CPAP flow sensing. The integration and use in CPAP devices is eased by the insensitivity of the sensor to the mounting orientation, its high resolution and low noise performance. Furthermore the SM933X improves pressure measurement in industrial applications, replacing costly, bulky equipment consisting of several components with one single sensor system in a small outline package and inherent long term stability. Key applications include pressure transmitters and pressure switches.
“SMI has had a tradition of being on the cutting edge of MEMS low pressure sensors dating back to the mid 90’s. With the launch of the SM933X series, the company looks to extend that leadership into its 3rd decade.” says Omar Abed, President and CEO of SMI. “We have received overwhelmingly positive feedback from our lead customers. We are convinced that the launch of this new product line will set the benchmark for ultra-low pressure sensors below 2 inH2O and usher in a new wave of innovation in medical and industrial flow and ultra-low pressure applications.”
Please visit the product page for more information and the SM933X data sheet.
About SMI
SMI is a member of the worldwide Elmos Semiconductor Group, offering proven solutions to a range of industries, based on application-specific ICs, sensors and complete microsystems. SMI is an ISO certified premier developer and manufacturer of MEMS-based pressure sensors for a broad range of markets, with over 25 years of experience. SMI’s design, production and quality control processes have enabled it to develop both the most sensitive and smallest MEMS pressure sensors available on the market today.
About Elmos Semiconductor AG
Elmos develops, produces and markets semiconductors and sensors, primarily for use in the automotive industry. Our components communicate, measure, regulate and control safety, comfort, powertrain and network functions. For over 30 years, Elmos innovations have been bringing new functions to life and making mobility worldwide safer, more comfortable and more energy efficient.