MEMS sensors
for automotive applications
APPLICATIONS
ST’s automotive solutions
STMicroelectronics is one of the leading automotive electronics suppliers, with tens of years of expertise
in manufacturing and testing of ICs designed to perform under the most stringent automotive
environmental conditions. We are committed to making cars safer and more comfortable,
to improve the life of millions of people every day.
ST has shipped more than 9 billion MEMS sensors to customers and has a unique sensor portfolio,
from discrete to fully-integrated solutions. Dedicated 8-inch wafer production lines with high-volume
manufacturing and full in-house dual sourcing guarantee fast time-to-market, cost-effectiveness and
100% security of supply.
Roll detection
Navigation
assistance
Telematics
boxes
Infotainment
Airbags-peripherals
Engine control
MEMS sensors are acquiring a key role in automotive infotainment and safety applications.
According to IHS*, the market for automotive MEMS devices increased 13% last year, indicating sensor
penetration rates that continue to grow faster than the growth of passenger vehicles.
Higher accuracy, self-test capabilities and the need for rapid data transmission are fueling the trend
towards more intelligent sensors. ST’s sensors meet these requirements, featuring high resolution,
embedded self-test, small size and smart power management to reduce energy consumption.
Airbags-peripherals
*Source: IHS Market Tracker Automotive MEMS H1 2014
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Anti-theft
systems
ST’S
MARKET-PROVEN
MANUFACTURING
TECHNOLOGY
PARTNERSHIP
WITH OEMS
IN PRODUCT
DEVELOPMENT
Electronic stability
control
Airbags-peripherals
EXPERTISE
IN MULTI-AXIS
SENSOR
INTEGRATION
HIGH-VOLUME
MANUFACTURING
CAPABILITY
NON-SAFETY
PASSIVE SAFETY
IN DEVELOPMENT
Airbags-central
unit
Electronic stability
control
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Automotive MEMS sensors
Non-safety applications
ST offers a portfolio of MEMS automotive sensors qualified according to AEC-Q100. Our automotive sensor
portfolio includes digital accelerometers with low- and high-g, full scale, digital 3-axis gyroscopes, and
6-axis system-in-packages (3D digital accelerometer + 3D digital gyroscope).
Low-g 3-axis accelerometers have advanced power-saving features and an extended temperature
range that make them the ideal choice for non-critical automotive applications including telematics,
navigation, infotainment and security. Our high-g acceleration sensors feature an extended temperature
range and are suitable for airbag applications in vehicle safety restraint systems.
Our 3-axis gyroscopes offer superior stability over time and temperature, and guarantee the level of
accuracy required by the most advanced navigation systems embedding dead reckoning.
Our angular rate sensors for navigation are based on a single sensing structure for motion measurement
along all three orthogonal axes, while other solutions on the market rely on two or three independent
structures. Our solution eliminates any interference between the axes that inherently degrades the output
signal. The result is increased accuracy and reliability of motion-controlled functionalities.
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iNEMO® 6-axis system-in-packages integrate accelerometer and gyroscope in a single device, with
benefits in terms of accuracy, space and cost optimization. Multi-axis gyroscopes and accelerometers
are used for assisted navigation and empower sophisticated dead reckoning software algorithms that
calculate current position from a previously determined location updated by time, acceleration, and
change of direction.
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ST products are developed together with OEMs to the highest possible requirements. Other than sensors
already available in the market, ST works with the leading car manufacturers on new sensing solutions for
automotive applications.
NON-SAFETY
PASSIVE SAFETY
• Navigation assistance
• AIRBAGS:
• Anti-theft systems
• Telematics boxes
• Infotainment
peripheral
and on-board
accelerometers
AIS328DQ ULTRA-LOW-POWER 3-AXIS ACCELEROMETER
The AIS328DQ 3-axis linear accelerometer features ultra-low-power operational modes
that allow advanced power-saving and smart sleep-to-wakeup functions. It has dynamic
user-selectable full-scales of ±2g/±4g/±8g and is capable of measuring accelerations
with output data rates from 0.5 Hz to 1 kHz.
The self-test capability lets the user check the functioning of the sensor in the final application.
Available in a small QFPN package with a 4x4 mm footprint, the AIS328DQ is guaranteed to
operate over a temperature range from -40 °C to +105 °C.
AIS328DQ accelerometer
A3G4250D Gyro
AIS3624DQ accelerometer
ASM330LXH* 6-axis Combo
AIS1200PS accelerometer
AIS2120SX* accelerometer
*Development
Key features
Benefits
Low power consumption
Battery saving (ignition off)
3-axis
For accurate tilt measurement
A3G4250D 3-AXIS DIGITAL GYROSCOPE
The A3G4250D is a low-power 3-axis angular rate sensor able to provide unprecedented
stability at zero rate level and sensitivity over temperature and time. It offers ±245 dps full
scale and is capable of measuring rates with a user-selectable bandwidth.
Available in a plastic land grid array (LGA) package, it can operate within a temperature range
of -40 °C +85 °C.
Key features
Benefits
3-axis
Single device for multiple application (Pitch, Roll, Yaw)
16-bit data output
Suitable for high resolution applications
AIS3624DQ 3-AXIS MEDIUM-G ACCELEROMETER
The AIS3624DQ offers the same features of AIS328DQ, including smart power management
and small footprint, while offering a more extended full scale range of ±6g/±12g/±24g.
The product addresses a variety of automotive non-safety applications such as eCall systems,
telematics boxes, impact recognition and logging systems.
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Key features
Benefits
Medium-g detection
Accurate crash recording
Pin-to-pin compatible with AIS328DQ
Scalable solution
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AIS3624DQ is ideal for applications such as eCall systems.
ASM330LXH iNEMO INERTIAL MODULE
(3D ACCELEROMETER AND 3D GYROSCOPE)
The ASM330LXH is a system-in-package featuring both a 3D digital accelerometer and a 3D
digital gyroscope. It has a user-selectable full scale acceleration range of ±2/±4/±8/±16 g
and an angular rate range of ±125/±245/±500/±1000/±2000 dps. The ASM330LXH has two
operating modes enabling the accelerometer and gyroscope sensors to be either activated at
the same ODR or the accelerometer can be enabled while the gyroscope is powered down.
Key features
Benefits
Single-chip solution
Cost-effective
6-axis
Independent on tilt installation
Smallest footprint
Compact system design
Synchronized output
Precise motion reconstruction (by algorithm)
Low power consumption
Battery saving (ignition off)
TESEO-DRAW - SENSOR-ASSISTED NAVIGATION
ST provides a fully configurable solution for dead reckoning built with Teseo receivers and sensors, to support different applications.
TESEO-DRAW (Dead Reckoning Automotive Way) optimally merges the contribution from GNSS and sensors:
• Updates car position/velocity when GNSS satellites signal is not available (tunnels, obscured areas)
• Improves car position/velocity when GNSS satellites signals are marginal (urban canyons, partially obscured areas)
Open sky
Tunnel
Good GNSS
Multi-layer
street
Urban
canyon
Multi-layer
parking
Passive safety applications
Poor GNSS
No GNSS
Calibration
Teseo
DRAW
GNSS
GNSS
Position, velocity
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GNSS
Position, velocity
Position, velocity
The Teseo platform is a high-sensitivity, standalone GPS solution compatible with multiple satellite navigation systems, including the Chinese
BeiDou, US GPS, European Galileo, Russian GLONASS and Japanese QZSS.
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ST’S DEAD RECKONING ARCHITECTURE
STMicroelectronics has a deep expertise in sensor integration and new application
development and can assist customers in their design-in process. ST’s evaluation kits
and firmware allows a real-time evaluation of sensors performance in customer’s applications.
Passive safety includes all applications that protect car occupants during a crash and feature post-crash
effects mitigation.
The airbag control unit (ACU) detects and evaluates a crash, before triggering the appropriate restraint
system according to the type of collision and its severity. Information is supplied to the control unit
by several satellite acceleration sensors (to evaluate and compare each of their signals).
height (h)
GNSS HW
DR CONFIG
CLASSIC FREEMOUNT
- 3AX GYRO + ODO
+ ACCELEROMETER
CLASSIC
- 1AX GYRO + ODO
CAN BASED
- STABILITY GYRO + ODO
- DWP FRONT OR REAR
Sensor data
DR SENSORS
CAN BUS
(ABS, SPEED,
ESP GYRO)
ACCELEROMETER
[3AX]
GYRO
[1 or 3 AX]
ANALOG
ODOMETER
TEMPERATURE
SENSOR
AIS1200PS MEMS SATELLITE ACCELEROMETER SENSOR,
SINGLE AXIS WITH PSI5 POINT-TO-POINT INTERFACE
The AIS1200PS is a peripheral acceleration sensor with a single-axis sensing element and
an IC interface able to provide acceleration information to a master control unit through a
Manchester-coded protocol (125 Kbit/s).
The AIS1200PS has a full scale of ±200 g.
The device is available in a plastic SOIC package with 150 mils reverse frame forming for EMC
enhancement and is specified for a temperature range extending from -40 to +125 °C.
Key features
Benefits
200 g full scale
Wide signal amplitude detection
Temperature range up to 125°C
Ideal for harsh environment
Only two external components required
Cost-effective
AISx120SX SINGLE OR DUAL AXIS CENTRAL ACCELEROMETER
Design support
The AIS1120SX / AIS2120SX is a central acceleration sensor with a single- or dual-axis sensing element and an IC interface able to provide
the acceleration information to an airbag master control unit via the SPI protocol.
The AIS1120SX / AIS2120SX has a full scale of ±120 g. Available in a plastic SOIC8 package, it is specified for an extended temperature range
from -40°C to +105°C.
Key features
Benefits
Single- or dual-axis
Design flexibility/scalability
Embedded offset cancellation
Stability over time
Bandwidth up to 1600 Hz
Fast signal response
With an extensive expertise in sensor integration and the development of new applications, ST can assist customers in their design-in phase.
ST’s evaluation kits and firmware allows a real-time evaluation of sensor performance in customer applications.
USB connector
Adapter
STM32
microcontroller
STEVAL-MKI109V2
PRODUCTS UNDER DEVELOPMENT
ST is developing and qualifying new sensors addressing various automotive applications, with the goal to improve car performance,
safety, and comfort:
• Barometric pressure sensors (starting from 2017) for non-safety applications,
such as engine control, mass air flow, seat comfort, and car navigation
JTAG/SWD
Test points
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ST offers a complete evaluation solution including:
• A full set of DIL24 MEMS non-safety sensor adapters supporting fast prototyping
• eMotion motherboard compatible with all adapters and based on an STM32 microcontroller
• Inertial measurement units (starting from 2018) for active safety applications,
such as electronic stability control, roll over stability, hill-start assist,
and electronic parking brake
• UNICO graphic user interface for direct and real-time access to the sensor outputs and configuration registers.
Board
Description
Order code
ST MEMS motherboard is based
on the high-performance STM32F103 32-bit ARM
Cortex™-M3 MCU
Motherboard
Interfaces: USB connector and JTAG/SWD
for debugging
STEVAL-MKI109V2
DFU-compatible for USB
microprocessor firmware updates
Compatible with all ST MEMS adapters
Adapter board
AIS328DQ
STEVAL-MKI110V1
Adapter board
AIS3624DQ
STEVAL-MKI158V1
Adapter board
A3G4250D
STEVAL-MKI125V1
Adapter board
ASM330LXH
STEVAL-MKI171V1*
Note: *available starting from H2 2015
Technical documents
To see all technical documents and files for a specific product, go to www.st.com/sensors and select the product you are interested
in through our product catalog. Each part number has a corresponding web page where you can easily find all associated technical documents
and resources.
Developer links
• For more information about MEMS sensors for automotive applications: www.st.com/memsauto
• For more information about MEMS evaluation boards: www.st.com/mems-boards
• To take part to our forums: www.st.com/e2e
Online support
For technical support or questions about product availability, pricing, where-to-buy, or other related issues, go to www.st.com/onlinesupport
© STMicroelectronics - May 2015 - Printed in United Kingdom - All rights reserved
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All other names are the property of their respective owners
Order code: BRMEMSAUTO0515
For more information on ST products and solutions, visit www.st.com