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MEMS VC accelerometers accurately measure vibration

Posted: 25 Aug 2014     Print Version  Bookmark and Share

Keywords:Silicon Designs  MEMS  variable capacitive accelerometer  microcomputer 

Silicon Designs has announced the Model 1410 that the company describes as a family of digital pulse density output MEMS variable capacitive (VC) accelerometers. The devices are intended to reliably measure both vibration and acceleration, with very low power consumption and high long-term bias stability (1000ppm typical). Consuming 2mA with 5V excitation makes them suitable for use within low current applications, the company added.

The Model 1410 uses a clock frequency between 100kHz and 1MHz and produces a pulse density output relative to acceleration. Units are available in seven standard ranges, from ±2g to ±200g, with sensitivities from 0.625kHz/g (200g range) to 62.5kHz/g (2g range). Frequency response is from 0-400Hz (±2g) up to 0-2kHz (±200g) at fixed intervals according to selected g range, successfully responding to DC (continuous) and dynamic acceleration. A robust MEMS VC accelerometer design allows the Model 1410 to withstand mechanical shock inputs up to 5000g (2000g on low range units, 2g and 5g FSO) without damaging the unit. All units are serialised for traceability and quality control. Custom ranges are available upon request.

Model 1410

Design of the Model 1410 incorporates Silicon Designs' own proprietary MEMS sensing element, which features constant nitrogen damping over its full operating temperature range (-55°C to 125°C). Each unit is hermetically sealed in a miniature package measuring 0.360 x 0.350 x 0.165in terminating in either a 20-pin LCC or JLCC type connector. This suits them to placement on circuit boards, in small packages or for OEM applications. The digital output signal of the Model 1410 is compatible with TTL/CMOS devices, to interface to microprocessors and other instrumentation. The SDI Model 1410 may also be used as a higher performance drop-in replacement for the Model 1010.

Typical applications include microcomputer controlled applications such as automotive airbags, active suspension, adaptive brakes and security systems; fusing; shipping recorders; appliances; vibration measurement and analysis, and machinery control.

- Graham Prophet
  EE Times Europe

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