Digital-Output MEMS Accelerometer - Analog Devices
Description
Data Sheet ADXL362
Micropower, 3-Axis, ±2 g/±4 g/±8 g Digital Output MEMS Accelerometer
FEATURES
► Ultra low power ► Power can be derived from coin cell battery ► 1.
8 µA at 100 Hz ODR, 2.
0 V supply ► 3.
0 µA at 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 ► Autonomous interrupt processing, without need for microcon-
troller intervention, to allow the rest of the system to be turned off completely ► Deep embedded FIFO minimizes host processor load ► Awake state output enables implementation of standalone, motion activated switch ► 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
APPLICATIONS
► Hearing aids ► Home healthcare devices ► Motion enabled power save switches ► Wireless sensors ► Motion enabled metering devices
FUNCTIONAL BLOCK DIAGRAM
GENERAL DESCRIPTION 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 t...
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