STMicroelectronics enables quieter cabins for the electric-vehicle age with advanced vibration sensor to eliminate road noise
October 03 2022 - 9:00AM
STMicroelectronics enables quieter cabins
for the electric-vehicle age with advanced vibration
sensor to eliminate road noise
Optimized for sensing road noise and related
vibration, AIS25BA is best-in-class automotive MEMS accelerometer
for accuracy in controlling and quieting in-cabin acoustic
environment
Geneva, October 3,
2022 –
STMicroelectronics (NYSE: STM), a global
semiconductor leader serving customers across the spectrum of
electronics applications, is enabling more acoustically comfortable
cars, with its new sensor for road-noise cancellation (RNC) through
active noise-control (ANC) techniques. Cars have traditionally been
defined by engine performance, exterior design, and powertrains,
but drivers and passengers are increasingly focused on comfort.
Indeed, while Electric Vehicles (EV) are intrinsically less
noisy than internal combustion engine cars (ICE), car makers are
focused on further lowering in-cabin noise due to wheel or
vibration. These efforts aim to allow passenger to better enjoy the
journey in a quieter ambient environment.
Noise cancellation algorithms, working with an array of sensors
installed throughout the vehicle, measure the ambient sounds, and
eliminate vibration using noise-cancelling waveforms that act as
anti-vibration (cancelling) sounds.
“In today’s digital age, canceling – not deadening – unwanted
sounds is the smart way to ensure a quieter cabin for safer, more
enjoyable journeys,” said Simone Ferri, MEMS Sub-Group General
Manager of Marketing, Analog, MEMS and Sensors Group,
STMicroelectronics. “With the transition to hybrid and electric
vehicles, which can be strongly affected by road noise, our AIS25BA
accelerometer delivers superior value for system designers.”
ST has leveraged its competencies in micro electro-mechanical
system (MEMS) ICs to give the AIS25BA superior characteristics for
enhancing RNC system accuracy. The sensor has the lowest electrical
noise in the market, which helps vehicle engineers achieve the
calmest possible in-car environment. On the other hand, it has the
fast response/low latency needed by the RNC system to calculate
corrective waveforms in real-time as well as wide bandwidth to
capture disturbances across the full spectrum of sound frequency
relevant for the application. Its wide temperature range and
mechanical robustness allows placement in the harshest places of
today’s vehicles: near the engine or electric drive as well as
close to wheels and suspension.
Further technical information:
ST’s AIS25BA 3-axis accelerometer is engineered to prioritize
RNC system accuracy. At 30µg/√Hz in X and Y axes and 50µg/√Hz in
the Z axis, it has extremely low noise density, which is up to 58%
better than the closest competing alternative.
With this outstanding noise performance, frequency response
extends to 2 and hence covers all the spectrum relevant for in-car
noise cancellation. Similarly, the total sensor latency of 266µs is
engineered for leaving the system plenty of time to generate
noise-cancellation signals in real-time.
In addition, the sensor has a time-division multiplex (TDM)
digital interface that enables the system to synchronize the
outputs from multiple accelerometers installed to measure
vibrations throughout the vehicle. This audio-friendly interface
also allows easy connection to other types of data buses widely
adopted in automotive. The full-scale measurement range is
selectable up to ±7.7g, giving plenty of margin with respect to the
intense vibrations typical of the application. The supply-voltage
range is 1.71V to 1.99V.
The AIS25BA is compliant with AEC-Q100 and is available now in a
14-lead 2.5mm x 2.5mm x 0.86mm LGA package, priced from $3.90 for
orders of 1000 pieces. Please contact your local ST sales
representative for sample requests.
About STMicroelectronicsAt ST, we are 48,000
creators and makers of semiconductor technologies mastering the
semiconductor supply chain with state-of-the-art manufacturing
facilities. An integrated device manufacturer, we work with more
than 200,000 customers and thousands of partners to design and
build products, solutions, and ecosystems that address their
challenges and opportunities, and the need to support a more
sustainable world. Our technologies enable smarter mobility, more
efficient power and energy management, and the wide-scale
deployment of the Internet of Things and connectivity. ST is
committed to becoming carbon neutral by 2027. Further information
can be found at www.st.com.
For Press Information
Contact:STMicroelectronicsMichael MarkowitzDirector
Technical Media RelationsTel: +1 781 591 0354Email:
michael.markowitz@st.com
- P4486D -- Oct 3 2022 -- AIS25BA noise-cancellation
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- P4486D -- Oct 3 2022 -- AIS25BA noise-cancellation
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