MEMs accelerometer boasts ultra-low power consumption
The ADXL367 from Analog Devices is an ultralow power, 3-axis microelectromechanical systems (MEMS) accelerometer that consumes just 0.89 μA at a 100 Hz output data rate and 180 nA when in motion-triggered wake-up mode.
This is the lowest power consumption currently available on the market. Unlike accelerometers that use power duty cycling to achieve low power consumption, the ADXL367 does not alias input signals by undersampling, but samples the full bandwidth of the sensor at all data rates.
In addition to ultralow power consumption, the accelerometer has many additional features to enable true system-level power reduction.
These include a deep multimode output first in, first out (FIFO), a built-in micropower temperature sensor, and an internal analogue-to-digital converter (ADC) for synchronous conversion of an additional analogue input with interrupt capability.
Single-tap and double-tap detection can operate at any output data rate with only an added 35 nA of current, and a state machine to prevent a false triggering.
In addition, the device has provisions for external control of the sampling time and/or an external clock.
The accelerometer always provides 14-bit output resolution with 8-bit formatted data offered for more efficient single-byte transfers when a lower output resolution is sufficient.
12-bit formatted data is also provided allowing for design compatibility with the ADXL362 MEMS sensor from Analog Devices.
Measurement ranges of ±2 g, ±4 g, and ±8 g are available, with a resolution of 0.25 mg/LSB on the ±2 g range.
The ADXL367 operates on a wide 1.1 V to 3.6 V supply range, and can interface, if necessary, to a host operating on a separate supply voltage. The device has internal voltage regulation and the capability to operate from a 1.1V supply means it can operate directly connected to battery cells including zinc air batteries.
It is housed in a compact LGA package measuring just 2.2 mm × 2.3 mm × 0.87 mm, the device has an industrial temperature range of -40°C to +85°C.
The ADXL367 is supported by the EVAL-ADXL367-SDP, an easy-to-use Customer Evaluation System that allows the user a quick start on testing and evaluating the accelerometer. The system consists of a main board (EVAL-SDP-CB1Z evaluation platform), an interface board (EVAL-SDP-INTER4-Z), and a satellite board (EVAL-ADXL367Z breakout board).
The EVAL-SDP-CB1Z board, also called “SDP-B”, connects directly to a PC via an USB cable, with the USB connection providing both communications and power to the board. The SDP-B is connected to the interface board (EVAL-SDP-INTER4-Z), which provides the signal conditioning and electrical connections to communicate with the satellite board (EVAL-ADXL367Z) through a cable.
This cable allows the satellite to be easily manipulated for testing or separately placed into an environmental chamber for temperature or humidity testing. Separating the boards mitigates corruption of data due to the temperature and humidity effects of other components. The EVAL-ADXL367-SDP Customer Evaluation System comes with all the necessary cables and connectors.
Furthermore, the satellite breakout board EVAL-ADXL367Z can be supplied separately for integration into an existing system with an SPI or I2C interface.
The ADXL367 MEMS accelerometer is suitable for a wide range of applications including Industrial machinery, Digital healthcare, Prosumer, Hearing aids & hearables, Vital signs monitoring devices, Motion-enabled power save switches, Motion-enabled metering devices, Smart watch with single-cell operation and Smart home devices.
Anglia Components is offering customers a FREE evaluation board and samples of the accelerometer.