STMicroelectronics Unveils Ultra-Compact 3-Axis Accelerometer with Embedded Microcontroller for Advanced Motion-Recognition Capabilities and Sensor Hub

Tue Jan 22, 2013 9:00am EST

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Smart sensor packs motion sensing and intelligence
 into 9 mm3

Geneva, January 22, 2013 - STMicroelectronics (NYSE: STM), a global semiconductor leader serving
customers across the spectrum of electronics applications and the world's top manufacturer of MEMS
(Micro-Electro-Mechanical Systems)[1] #_ftn1 , today announced details of a miniature smart sensor
that combines a 3-axis accelerometer with an embedded microcontroller together in an ultra-compact
3x3x1mm LGA package for advanced custom motion-recognition capabilities.

ST has combined the microcontroller, 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. 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 optimization. 

"Customers want smarter motion sensors that integrate both sensing and intelligent decision making
in a single package," said Fabio Pasolini, STMicroelectronics General Manager, Motion MEMS
Division, Analog, MEMS and Sensors Group, Industrial and Multisegment Sector. "The iNEMO family
gives ST an unrivalled ability to integrate any combination of accelerometers, gyroscopes,
magnetometers and other sensors with a powerful ARM-based sensor-hub microcontroller to give our
customers the maximum flexibility and scalability in system partitioning."

The LIS331EB iNEMO-A smart sensor  targets a
wide range of 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 perfectly suited
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 (first-in first-out). The
FSM and FIFO enable custom motion-recognition detection, including specific gesture detection, and
a pedometer that can run without using the embedded microcontroller, further reducing the overall
power consumption. The FSM can also be used to wake up the microcontroller, enabling advanced
power management techniques.

The high performance 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 Memory
and 128KB RAM memory, as well as multiple timers and I/O ports (GPIOs/SPI/I2C/UART).

The LIS331EB  smart motion sensor will start
sampling in Q2 2013. Unit pricing is US$2.4 for volumes in the range of 1,000 pieces. If your
company has a high-volume need, please contact your ST sales office.

For further information on ST's complete MEMS portfolio see

About STMicroelectronics
ST is a global leader in the semiconductor market serving customers across the spectrum of sense
and power and automotive products and embedded processing solutions. From energy management and
savings to trust and data security, from healthcare and wellness to smart consumer devices, in the
home, car and office, at work and at play, ST is found everywhere microelectronics make a positive
and innovative contribution to people's life. By getting more from technology to get more from
life, ST stands for life.augmented.

In 2011, the Company's net revenues were $9.73 billion. Further information on ST can be found at .

For Press Information Contact:
Michael Markowitz
Director Technical Media Relations
+1 781 591 0354 


[1] #_ftnref1  IHS iSuppli: MEMS Competitive Analysis 2012

ST Smart Sensor 
ST Smart Sensor_IMAGE 


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