Analog Devices Inc. ADXL366 3-Axis Digital Output MEMS Accelerometers
Analog Devices ADXL366 3-Axis Digital Output Microelectromechanical Systems (MEMS) Accelerometers are ultra-low power devices that consume 0.96µA at a 100Hz output data rate (ODR) and 191nA when in motion-triggered wake-up mode. Unlike accelerometers that rely on power duty cycling and undersampling to reduce power consumption, the ADXL366 maintains full-bandwidth sampling at all data rates, avoiding signal aliasing. It delivers 14-bit output resolution, with optional 8-bit and 12-bit formats for efficient data handling and compatibility with ADXL362 designs. The sensor supports selectable measurement ranges of ±2g, ±4g, and ±8g, offering a fine resolution of 0.25 mg/LSB in the ±2g range.
Beyond ultra-low power consumption, the Analog Devices ADXL366 integrates features that enable true system-level power savings. It includes a configurable step counter, a deep multimode first-in/first-out (FIFO), a micropower temperature sensor, and an internal Analog-to-Digital Converter (ADC) for synchronized analog input conversion with interrupt capability. Single- and double-tap detection operate at any output data rate with 35nA of added current, supported by a state machine to reduce false triggers. The devices also support external control of sampling time and clock input. Operating from a wide 1.1V to 3.6V supply, these accelerometers can interface with hosts on separate voltages. Housed in a compact 2.2mm × 2.3mm × 0.87mm, 12-terminal LGA package, the ADXL366 components are pin-compatible with the ADXL367.
Features
- ±2g, ±4g, and ±8g selectable measurement ranges
- 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 0.25mg/LSB sensitivity
- 130µg/√Hz noise density 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
- Built-in features for system-level power savings
- Step counter with only 120nA of added current
- Single-/double-tap detection with 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 the implementation of a motion-activated switch
- SPI (4-wire) and I2C digital interfaces
- Small and thin, 2.2mm × 2.3mm × 0.87mm, 12-terminal LGA package
Applications
- 24/7 sensing
- Hearing aids
- Vital signs monitoring devices
- Motion-enabled power save switches
- Motion-enabled metering devices
- Smart watches with single-cell operation
- Smart homes
Videos
Functional Block Diagram
PIN CONFIGURATION & FUNCTION
Resources
Development Tool
Analog Devices Inc. EVAL-ADXL366Z Breakout Board for ADXL366
Evaluation board that allows quick evaluation of the ADXL366, a 3-axis MEMS accelerometer.
Related Accelerometers
Analog Devices Inc. Acelerómetro MEMS ADXL367
An ultra low power, 3-axis MEMS accelerometer that consumes 0.89μA at a 100Hz output data rate.