Motion sensor offers low-power settings

-February 20, 2017

Small enough for wearable devices, STMicroelectronics’ LIS2DW12 three-axis accelerometer draws only 50 nA in standby mode and 380 nA in low-power mode at a 1.6-Hz output data rate, adding negligible load on the battery. Operating from a supply voltage of 1.62 to 3.6 V, the LIS2DW12 enables extended operation from small coin or button cells.

The MEMS device provides 16-bit output and can be set to prioritize low power consumption or low-noise performance, with a choice of five settings in either mode. According to the manufacturer, the sensor’s noise density of down to 90 µg/√Hz is 25% lower than similar devices in the marketplace, which improves measurement accuracy in a wide range of healthcare, fitness, gaming, industrial, and environmental applications.

The LIS2DW12 has user-selectable full-scale ranges of ±2 g, ±4 g, ±8 g, and ±16 g and is capable of measuring accelerations with output data rates from 1.6 Hz to 1600 Hz. Other features include an embedded self-test capability, an integrated 32-level FIFO, a built-in temperature sensor, and a programmable interrupt for freefall, wake up, activity/inactivity, 6-D/4-D orientation detection, and tap/double-tap detection.

Engineering samples of the LIS2DW12 are available now, with volume production to begin in Q1 2017. Prices for the accelerometer housed in a 2×2×0.7-mm LGA package start at $0.75 in lots of 1000 units.

LIS2DW12 product page


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