electronica – High performance 3 axis MEMS accelerometer

Murata has introduced the SCA3300 series of high performance 3 axis MEMS accelerometers aimed at a broad range of industrial and automotive applications.

The device measures 7.6 x 8.6 x 3.3mm and this small surface mounted MEMS sensor is able to offer users a selectable measurement range of 1.5 g, 3 g or 6 g and features better than 10 mg offset stability. The SCA3300 series has a non-linearity of 0.1 % and typical noise density 37 ug/√Hz. Mechanical over damping of the sensor enables extremely high performance measurements in harsh, vibrating environments.

The sensor, packaged in a pre-molded dual flat lead SMD housing, operates from a 3.3 VDC supply and consumes only 1 mA during normal operation making it suitable for battery powered applications. In its low power mode, consumption drops to about 0.5 mA. Communication with the host application is via an industry standard SPI interface.

The SCA3300 is qualified according to the automotive AEC-Q100 quality standard. It features extensive failsafe functions and flags for diagnostics such as: monitoring of an internal reference signal, checksum techniques for verifying communication and signal saturation / over range monitoring.

The diagnostic feature in the device is continuously running self-test and verifies the proper operation of the whole signal chain from MEMS sensor movement to signal conditioning circuitry in each measurement cycle.

Operating temperature range is from – 40C to + 125C.

Target applications include levelling and alignment systems, inertial measurement units for heavy machinery, navigation systems, AGVs, and construction and surveying tools. There is also a wide range of different future applications in high accuracy automotive inertial sensing, like in autonomous driving (ADAS) and intelligent transmission control that can be enabled by this sensor.Inclination sensing in weighing scales is another example application.

An evaluation board is available for the SCA3300 that incorporates a Java-based GUI to graph sensor output, data logging and data rate calculations.

Neil Tyler