ADXL373

The ADXL373 is an ultra low power, 3-axis, ±400 g microelectromechanical systems (MEMS) accelerometer that consumes 19 μA at a 2560 Hz output data rate (ODR). The ADXL373 does not power cycle its front end to achieve its low power operation and therefore does not run the risk of aliasing the output of the sensor.

In addition to its ultra low power consumption, the ADXL373 enables impact detection while providing system level power reduction.

Two additional lower power modes with interrupt driven, wake-up features are available for monitoring motion during periods of inactivity. In wake-up mode, acceleration data can be averaged to obtain a low enough output noise to trigger on low g thresholds. In instant on mode, the ADXL373 consumes 1.4 μA while continuously monitoring the environment for impacts. When an impact event that exceeds the internally set threshold is detected, the device switches to normal operating mode fast enough to record the event.

High g applications tend to experience acceleration content over a wide range of frequencies. The ADXL373 includes a four-pole, low-pass antialiasing filter to attenuate out-of-band signals that are common in high g applications. The ADXL373 also incorporates a high-pass filter to eliminate initial and slow changing errors such as ambient temperature drift.

The ADXL373 provides 12-bit output data at 200 mg/LSB scale factor. The user can access configuration and data registers via the serial peripheral interface (SPI) or I²C protocol. The ADXL373 operates over a wide supply voltage range and is available in a 3.00 mm × 3.25 mm × 1.06 mm package.

APPLICATIONS

• Impact and shock detection
• Asset health assessment
• Portable Internet of Things (IoT) edge nodes
• Concussion and head trauma detection