Micropower, 3-Axis, ±2 g/±4 g/±8 g Digital Output MEMS Accelerometer

Hearing aids Home healthcare devices Motion enabled power save switches Wireless sensors Motion enabled metering devices

Ultralow power Power can be derived from coin cell battery 1.8 μA @ 100 Hz ODR, 2.0 V supply 3.0 μA @ 400 Hz ODR, 2.0 V supply 270 nA motion activated wake-up mode 10 nA standby current High resolution: 1 mg/LSB Built-in features for system-level power savings: Adjustable threshold sleep/wake modes for motion activation Low noise down to 175 μg/√Hz Wide supply and I/O voltage ranges: 1.6 V to 3.5 V Operates off 1.8 V to 3.3 V rails Acceleration sample synchronization via external trigger On-chip temperature sensor SPI digital interface Measurement ranges selectable via SPI command Small and thin 3 mm × 3.25 mm × 1.06 mm package

The ADXL362 is an ultralow power, 3-axis MEMS accelerometer that consumes less than 2 μA at a 100 Hz output data rate and 270 nA when in motion triggered wake-up mode. Unlike accelerometers that use power duty cycling to achieve low power consumption, the ADXL362 does not alias input signals by undersampling; it samples the full bandwidth of the sensor at all data rates.

The ADXL362 always provides 12-bit output resolution; 8-bit formatted data is also provided for more efficient single-byte transfers when a lower resolution is sufficient. Measurement ranges of ±2 g, ±4 g, and ±8 g are available, with a resolution of 1 mg/LSB on the ±2 g range. For applications where a noise level lower than the normal 550 μg/√Hz of the ADXL362 is desired, either of two lower noise modes (down to 175 μg/√Hz typical) can be selected at minimal increase in supply current.

In addition to its ultralow power consumption, the ADXL362 has many features to enable true system level power reduction. It includes a deep multimode output FIFO, a built-in micropower temperature sensor, and several activity detection modes including adjustable threshold sleep and wake-up operation that can run as low as 270 nA at a 6 Hz (approximate) measurement rate. A pin output is provided to directly control an external switch when activity is detected, if desired. In addition, the ADXL362 has provisions for external control of sampling time and/or an external clock.

The ADXL362 operates on a wide 1.6 V to 3.5 V supply range, and can interface, if necessary, to a host operating on a separate, lower supply voltage. The ADXL362 is available in a 3 mm × 3.25 mm × 1.06 mm package.