Norwood, Mass. Analog Device Inc. says its new two-axis ADXL213 iMEMS accelerometer provides precision tilt measurement with unequaled stability over temperature, in addition to, low power requirements and digital outputs for automotive security systems.
Key features of the ADXL213, the latest product in the company's ADXL2xx family of high-performance, low-g MEMS inertial sensors, include high zero-g bias stability, high sensitivity over temperature, pulse width modulated (PWM) digital outputs, and high precision tilt sensing. The new sensor detects very small tilt angles and the rate at which these angles change whenever an attempt is made to tow or jack up the vehicle.
Available in a 5 x 5 x 2-mm 8-pad hermetic LCC package, the ADXL213 is a complete dual-axis accelerometer with signal conditioned, duty cycle modulated outputs. Requiring only 0.7 mA, the ADXL213 measures acceleration with a full-scale range of ±1.2 g (typical) and is capable of measuring both dynamic acceleration (vibration) and static acceleration (gravity). The outputs are digital signals whose duty cycles (ratio of pulse width to period) are proportional to acceleration (30%/g). The duty cycle outputs can be directly measured by a microcontroller.
The new device simplifies designs by incorporating PWM digital outputs that enable high-resolution measurement and by directly interfacing to any low-cost microcontroller, said the company.
The ADXL213 improves on the existing ADXL202 in two critical specifications: zero-g stability over temperature and sensitivity. The high zero g bias stability is typically better than 0.25 mg per degree C, and sensitivity stability is typically better than 50 ppm/°C. The typical noise floor is 160 μg/square root (Hz), allowing signals below 1 mg (0.06 degree of inclination) to be resolved in tilt sensing applications using narrow bandwidths of less than 60 Hz. Bandwidths between 0.5 Hz to 250 Hz may be selected.
The iMEMS accelerometer is suitable for a variety of consumer, industrial and military applications where precise and reliable tilt measurement is required. These include motion detectors that sense small changes in tilt angles or displacements, electronic braking systems, and precision navigation systems such as compass tilt correction and GPS supplement (dead reckoning). They also may be used for stabilization/tilt correction for antenna systems, physiological monitoring (medical instrumentation/diagnostic equipment) as well as stability compensation for industrial equipment such as cranes, fork lifts, tank turrets, and work platforms.
The ADXL213 is priced at $5.50 in quantities of 10,000 units.
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