ADI claims lowest power accelerometer
Analog Devices has revealed a 2?A three-axis MEMS accelerometer, claiming it to be the lowest powered yet.
2µA is for operation at 100Hz update rate, while ‘motion sensing wake-up’ mode requites only 300nA, and there is a 10nA standby.
The chip has been dubbed ADXL362, and applications are expected in wireless sensor networks and wearable motion detectors.
“This low power consumption allows the ADXL362 to be used in applications that require battery life expectancy of months or years, and where battery replacement can be impractical or dangerous to the equipment or operator,” said ADI.
To save false wake-ups, on-chip circuits distinguish between different kinds of motion. and an internal FIFO memory “allows system designers to record data and stream long data sets, reducing processor load and saving additional system power”, claimed ADI.
Resolution is 12bit, and there is an 8bit resolution option for single-byte data transfers when a lower resolution is sufficient.
“The accelerometer has measurement ranges of +/-2, 4, and 8g, with a resolution of 1mgravity/LSB on the +/-2g range,” said ADI.
According to the firm, US military research organisation DARPA will be adopting the 362 in its second-generation ‘Blast Gauge’ – a device worn by soldiers to aid medical personnel performing triage on blast victims, which also provides data for scientists studying traumatic brain injury.