Accelerometer combines resolution and low power in tiny footprint

February 16, 2017 // By Graham Prophet
Designed for tasks in context sensing in Internet-of-Things (IoT) and wearable devices, STMicroelectronics’ LIS2DW12 3-axis accelerometer offers accuracy, flexibility, and energy savings by supporting multiple low-power and low-noise settings in a 2 x 2 x 0.7 mm package.

Joining ST’s low-power, high-performance MEMS product family the LIS2DW12 has 16-bit output and can be set to prioritize low power consumption or low-noise performance, with five settings in either mode. Four settings in each mode save waking the system to check for data, and allow efficient single-byte transfers thereby further minimizing system power consumption and helping extend battery life. Noise density down to 90 µg/√Hz is claimed as being at least 25% lower than similar devices in the marketplace, which improves the measurement accuracy in next-gen applications from healthcare, fitness, and gaming to industrial sensing and environmental monitoring.


Drawing 50 nA in standby, or 380 nA in low-power mode at 1.6 Hz Output Data Rate, the LIS2DW12 adds negligible load on the battery. The supply-voltage range of 1.62 - 3.6V allows extended operation from small coin or button cells. Features that support system-level power savings include a 32-level FIFO, a built-in temperature sensor, and a programmable interrupt for freefall, wake up, activity/inactivity, 6D/4D orientation detection, and tap/double-tap detection. It comes in a 2 x 2 x 0.7 mm package, for $0.75 (1000).