Accelerometer for power-train and automotive suspension applications

October 10, 2013 // By Graham Prophet
Murata's SCA720 series of analogue MEMS accelerometers is designed for electrically-controlled suspension and engine anti-vibration applications. Measuring 7.0 x 8.6 x 3.3 mm, the monolithic sensor is mechanically robust and has no deformation up to 70,000g.

The accelerometer’s 3D structure employs capacitive sensing techniques that give it sensitivity and offset stability. Internal inert gas damping of the MEMS sensing element provides a mechanical low-pass filter that cuts off above 115 Hz and provides a stable amplitude output and noise filtering.

Using an analogue output, the SCA720 can be placed remote from the controlling unit without any interference to the sensor's output, suiting the device to electrically controlled suspension (ESC) since it allows the freedom to place sensors where required. Measurement of Z-axis movement is possible with Murata’s Z-axis sensing element when mounted flat on a PCB that is positioned in an orientation parallel to the vehicle. The sensor is earth-gravity compensated with a +1 g offset where Vout is +2.5 VDC. Measurement range is 2.11g in both directions, providing a Vout in the range from 0 to +5 VDC. The SCA720 is validated to AEC-Q100.

Murata Europe; www.murata.eu