Analog Devices Inc. ADXL362 3-Axis MEMS Accelerometers
Analog Devices Inc. ADXL362 3-Axis MEMS Accelerometers consume less than 2μA at a 100Hz output data rate and 270nA when in motion triggered wake-up mode. The ADXL362 does not alias input signals by undersampling, instead it samples the full bandwidth of the sensor at all data rates, unlike accelerometers that use power duty cycling to achieve low power consumption.
The ADXL362 accelerometers offer a 12-bit output resolution and 8-bit formatted data is also provided for more efficient single-byte transfers when a lower resolution is sufficient. The device features measurement ranges of ±2g, ±4g, and ±8g, with a resolution of 1mg/LSB on the ±2g range. Two lower noise modes (down to 175μg/√Hz typical) can be selected at a minimal increase in supply current for applications where a noise level lower than the normal 550μg/√Hz of the ADXL362 is desired.
The ADXL362 has many features to enable true system level power reduction, including a deep multimode output FIFO, a built-in micropower temperature sensor, and several activity detection modes. These modes include adjustable threshold sleep and wake-up operation that can run as low as 270nA at a 6Hz measurement rate.
The MEMS accelerometers are available in a 3mm × 3.25mm × 1.06mm package and operate on a wide 1.6V to 3.5V supply range.
Features
- Ultralow power
- Power can be derived from coin cell battery
- 1.8μA at 100Hz ODR, 2.0V supply
- 3.0μA at 400Hz ODR, 2.0V supply
- 270nA motion activated wake-up mode
- 10nA standby current
- High resolution: 1mg/LSB
- Built-in features for system-level power savings:
- Adjustable threshold sleep/wake modes for motion activation
- Autonomous interrupt processing, without need for microcontroller 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 175μg/√Hz
- Wide supply and I/O voltage ranges: 1.6V to 3.5V
- Operates off 1.8V to 3.3V rails
- Acceleration sample synchronization via external trigger
- On-chip temperature sensor
- SPI digital interface
- Measurement ranges selectable via SPI command
- Small and thin 3mm × 3.25mm × 1.06mm package
Applications
- Hearing aids
- Home healthcare devices
- Motion enabled power save switches
- Wireless sensors
- Motion enabled metering devices
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