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3-axis accelerometer features embedded MCU

Posted: 25 Jan 2013 ?? ?Print Version ?Bookmark and Share

Keywords:embedded MCU? smart sensor? digital accelerometer?

STMicroelectronics has rolled out a miniature smart sensor that combines a 3-axis accelerometer with an embedded MCU. It comes in an ultra-compact 3 x 3 x 1mm LGA package for advanced custom motion-recognition capabilities, added the company.

ST has combined the MCU, operating as a sensor hub that runs sensor-fusion algorithms, and a high-precision 3-axis digital accelerometer into a single package it calls iNEMO-A. The device reduces the demand on the host controller and application processor and decreases power consumption in portable devices. Both benefits deliver greater freedom and flexibility to the design of motion-enabled consumer electronics, stated ST. The integration of high-resolution linear-motion sensing and the sensor hub in a single package increases system robustness and is ideally suited for board-layout optimisation, the company noted.

The LIS331EB iNEMO-A smart sensor targets applications that include wearable sensor applications, motion-activated user interfaces in phones and tablets and augmented reality. The device embeds an ultra-low-power ARM Cortex-M0 with functional capability, power consumption and memory size that is geared for sensor-hub applications and iNEMO sensor fusion on mobile applications. The sensor hub supports the connection of a 3-axis gyroscope, 3-axis magnetometer and a pressure sensor to deliver a full sensor-fusion solution. Additional sensors, such as temperature and humidity sensors, may also be connected.

Addressing power constraints in battery-operated portable devices, the LIS331EB iNEMO-A 3-axis digital accelerometer also contains two embedded finite state machines (FSM) and an embedded FIFO. The FSM and FIFO enable custom motion-recognition detection, including specific gesture detection and a pedometer that can run without using the embedded MCU, further reducing the overall power consumption. The FSM can also be used to wake up the MCU, enabling advanced power management techniques.

The 3-axis accelerometer in the LIS331EB iNEMO-A features a selectable full-scale range of 2g/4g/8g/16g and houses an ultra-low-power ARM Cortex-M0 core with 64KB flash and 128KB RAM, as well as multiple timers and I/O ports (GPIOs/SPI/I2C/UART).

The LIS331EB smart motion sensor will start sampling in Q2. Unit pricing is $2.4 for volumes in the range of 1,000 pieces.

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