New hermetic MEMS variable capacitive accelerometers for commercial and industrial applications

Silicon Designs has launched a new Model 2422H low-voltage, specialty hermetic, MEMS variable capacitive accelerometer modules for commercial and industrial applications. Available in eight unique models, with standard ranges from ±2g to ±400g, the series is designed for zero-to-medium frequency vibration and acceleration sensing where a hermetically sealed case and +5VDC regulated power supply are critical requirements. Design of the series includes the company’s own MEMS accelerometer chip, for an enhanced bias and scale factor over temperature performance specification, along with excellent long-term stability. Modules are packaged in a sturdy, IP67 rated, hermetically-sealed lightweight titanium case, for added protection from dust, corrosion, moisture, and other contaminants. Units are simply mounted via two screws, adhesive, or a magnet. The IP61 rated connector of the device meets IP67 requirements when sealed with a boot, sleeve or heat shrink. The series produces differential analog output voltage pairs (AON and AOP) which vary with acceleration. Signal outputs are fully differential about a common mode voltage of approximately 2.5V. Modules can maintain either a ±4V differential or 0.5V to 4.5V single-ended output, for complete measurement flexibility. They can also respond to both DC and AC (0 to 2000+Hz) acceleration. At zero acceleration, differential voltage output is nominally 0VDC; at plus/minus full-scale acceleration, it is ±4VDC. Units are also comparatively insensitive to temperature changes and gradients over a standard operating temperature range of -55C to +125C.