MEMS accelerometer for wake-up, context sensing in IoT, wearables

February 16, 2017 // By Peter Clarke
STMicroelectronics NV (Geneva, Switzerland) has developed a tri-axis MEMS accelerometer that is intended for wake-up and context sensing in Internet-of-Things (IoT) and wearable devices.

The LIS2DW12 has a 16-bit output and can be set to prioritize low power consumption or low-noise performance, with five settings in either mode. It can avoid waking the system to check for data and allows single-byte transfers.

The unit draws a current as little as 50nA in standby and 380nA in low-power mode at a data output rate of 1.6Hz. The supply voltage range goes from 3.6V down to 1.62V.

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.

The package measures 2mm by 2mm by 0.7mm.

Engineering samples of the LIS2DW12 are available with volume production due to begin in 1Q17. Budgetary pricing is from $0.75 for orders of 1000 pieces.

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