Low Power, 6-Axis Inertial Measurement Unit (IMU) for High-Accuracy Motion-Tracking in IoT and Wearable Applications

LSM6DST Inertial Measurement Unit from STMicroelectronics

The newly released 6-axis iNEMO LSM6DST Inertial Measurement Unit from STMicroelectronics integrates a 3-axis digital accelerometer and a 3-axis gyroscope into a compact and efficient System-in-Package. This new IMU has a low power consumption of 0.55 mA in high-performance mode and consumes as little as 4 mA in Accelerometer-only. These features enable the LSM6DST to be an always-on high-accuracy motion tracking with minimal impact on power consumption. ST’s low-noise (0.65Pa), high-accuracy (±0.5hPa), and I3C-enabled LPS22HH pressure sensor together provide highly accurate location tracking and meet the most restrictive power budgets too.

 

The module comes with a dedicated configurable signal processing path for OIS and auxiliary SPI, configurable for both the gyroscope and accelerometer and the Auxiliary SPI and primary interface (SPI / I²C & MIPI I3CSM) can configure the OIS. This enables LSM6DST to completely support EIS and OIS (Electronic and Optical Image Stabilization) applications.

 

ST’s robust and mature low-power ThELMA process technology adds to the long list of smart features LSM6DST comes endowed with. It supports and simplifies integration in low-power circuit designs and offers I²C, MIPI I3C, or SPI from the sensing element to the application. Besides, there is a 9-kbyte FIFO that allows dynamic data batching and 16 finite state machines to recognize programmed data sequences from the sensor and further reduce system-level power consumption.

 

Key Features of LSM6DST

  • Power consumption: 0.55 mA in combo normal mode
  • “Always-on" experience with low power consumption for both accelerometer and gyroscope
  • Independent IO supply (1.62 V)
  • SPI / I²C & MIPI I3CS1.0 serial interface
  • Advanced pedometer, step detector, and step counter
  • Embedded temperature sensor
  • Compact footprint: 2.5 mm x 3 mm x 0.83 mm
  • Smart FIFO up to 9 kbyte

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