Companies developing some of the newest sensor products tout their ability to improve overall long-term stability and the benefits of their ultra-compact forms. The DLVF series digital output sensor from All Sensors, Honeywell Sensing & Control’s TSC TruStability pressure sensors, and STMicroelectronics’ LPS25H digital barometer microelectromechanical-systems (MEMS) pressure sensor are a few examples.
DLVR Series Mini Digital Output Sensors
All Sensors’ DLVR series mini digital output sensors are based on the company’s CoBeam2 technology, which reduces package stress susceptibility, resulting in improved overall long-term stability. The technology also improves position sensitivity compared to single-die devices, the company says. Applications include heating, ventilating and air conditioning; medical breathing; industrial controls; environmental controls; and portable, handheld equipment.
The supply voltage options are designed to ease the integration of the sensors into a wide range of process control and measurement systems, enabling direct connection to serial communications channels. The sensors also can enter very-low-power modes between readings to minimize load on the power supply in battery-powered systems.
According to the company, these calibrated and compensated sensors provide accurate, stable output over a wide temperature range. They are intended for use with non-corrosive, non-ionic working fluids. A protective parylene coating is optionally available for moisture and harsh media protection.
TSC TruStability Pressure Sensors
Honeywell Sensing & Control’s TruStability TSC and NSC pressure sensors eliminate the need for system calibration over temperature and offer reduced part-to-part variation. They measure differential or gage pressures and are intended for use with non-corrosive, non-ionic gases. Numerous package styles and mounting options are available. Both series are piezoresistive silicon pressure sensors that offer a ratiometric analog output for reading pressure over the specified full-scale pressure span and temperature range.
The TSC series is temperature compensated and unamplified. Compensation makes it easier to integrate into a system by eliminating the need to calibrate the system over temperature. It also offers reduced part-to-part variation. The NSC series is uncompensated and unamplified, allowing customers the flexibility of performing their own calibration while still benefitting from the stability, accuracy, and repeatability that TruStability Pressure Sensors provide.
LPS25H Digital Barometer MEMS Pressure Sensor
STMicroelectronics’ LPS25H ultra-compact absolute piezoresistive pressure sensor includes a monolithic sensing element and an IC interface that can take the information from the sensing element and provide a digital signal to the external world.
The sensing element consists of a suspended membrane realized inside a single mono-silicon substrate. It can detect the absolute pressure and is manufactured with a dedicated process developed by the company.
The membrane is small compared to the traditionally built silicon micromachined membranes. An intrinsic mechanical stopper prevents breakage. The IC interface is manufactured using a standard CMOS process that allows a high level of integration to design a dedicated circuit that is trimmed to better match the sensing element characteristics.