ADXL366 Datasheet

• 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

• 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

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.