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.