FEATURES
► Power supply output voltage range
► 1.1V to 3.6V, allowing single cell battery operation
► Internal power supply regulation for high PSRR
► Ultralow power
► 0.96μA at 100Hz ODR (50Hz bandwidth), 2.0V supply
► 191nA current consumption in wake-up mode
► 47nA current consumption in standby mode
► High sensitivity: 0.25mg/LSB
► Built-in features for system-level power savings
► Step counter with only 120nA of added current
► Single-tap and double-tap detection with only 35nA of added
current
► Adjustable threshold sleep and wake-up modes for motion
activation
► Autonomous interrupt processing
► Deep 512 sample embedded FIFO minimizes host processor
load
► Awake state output enables implementation of motion activated
switch
► Noise density of 130μg/√Hz for ultra-low noise mode, 2g range
and 100Hz ODR
► Acceleration sample synchronization via external trigger
► On-chip temperature sensor
► Internal 2-pole anti-aliasing filter
► SPI (4-wire) and I2C digital interfaces
► Small and thin, 2.2 mm × 2.3 mm × 0.87 mm, 12-terminal LGA
package

APPLICATIONS
► 24/7 sensing
► Hearing aids
► Vital signs monitoring devices
► Motion-enabled power save switches
► Motion-enabled metering devices
► Smart watch with single-cell operation
► Smart home

GENERAL DESCRIPTION
The ADXL366 is an ultra-low power, 3-axis microelectromechanical
systems (MEMS) accelerometer that consumes only 0.96μA at a
100Hz output data rate (ODR) and 191nA when in motion-triggered
wake-up mode. Unlike accelerometers that use power duty cycling
to achieve low power consumption, the ADXL366 does not alias
input signals by undersampling but samples the full bandwidth of
the sensor at all data rates.
The ADXL366 provides 14-bit output resolution. When a lower
resolution is sufficient, 8-bit formatted data is also offered for
more efficient single-byte transfers. In addition, for ADXL362 design
compatibility, 12-bit formatted data is also provided. Measurement
ranges of ±2g, ±4g, and ±8g are available, with a resolution of
0.25mg/LSB on the ±2g range.
In addition to its ultra-low power consumption, the ADXL366 has
many features to enable true system-level power reduction. The
device includes a configurable step counter, a deep multimode output
first in, first out (FIFO), a built-in micropower temperature sensor,
an internal analog-to-digital converter (ADC) for synchronous
conversion of an additional analog input with interrupt capability,
single-tap and double-tap detection that can operate at any output
data rate with only an added 35nA of current, and a state machine
to prevent false triggering. In addition, the ADXL366 has provisions
for external control of the sampling time and/or an external clock.
The ADXL366 operates on a wide 1.1V to 3.6V power supply
operating voltage range and can interface, if necessary, to a host
operating on a separate supply voltage. The ADXL366 is available
in a 2.2mm × 2.3mm × 0.87mm footprint, 12-terminal LGA package
and is pin compatible with the ADXL367.