BMA222
Bosch Sensortec
BMA222
Digital, triaxial acceleration sensor
General description
The BMA222 is an advanced, ultra-small, triaxial, low-g acceleration sensor with digital interfaces, aiming for low-power consumer electronics applica-tions.
The BMA222 allows measurement of accelerations in 3 perpendicular axes and thus senses tilt, motion, shock and vibration in cellular phones, handhelds, computer peripherals, man-machine interfaces, virtual reality features and game controllers.
BMA222 target applications
Display profile switching (portrait/landscape,
f face-up/face-down switching)Flat detection f Tap sensin
g function f Menu scrolling f Gaming
f Advanced power management for mobile devices f Shock and free-fall detection f Step-counting
f Sensor features
With its size of only 2 mm x 2 mm the BMA222 represents a new generation of digital accelerati-on sensors. The BMA222 integrates a multitude of features that facilitate its use especially in the area of motion detection applications, such as device ori-entation detection, gaming, HMI and menu browser control. Featuring a full operation current consump-tion of only 139 μA the BMA222 is ideally suited for mobile consumer electronic devices. In low-power mode operation the current consumption can be even further reduced by almost one order of mag-nitude.
The BMA222 is highly configurable in order to give the designer full flexibility when integrating the sen-sor into his system.
Sensor operation
The BMA222 supports two modes of operation:1) Streaming data mode: Acceleration data is directly read-out via the sensor’s digital interface and comput-ed by a system μController, application processor or a base-band processor.
2) Interrupt engine mode: Acceleration data is com-puted already within the BMA222 by the integrated, programmable interrupt engine. Depending on the programmable settings the integrated interrupt engine of the BMA222 signals the occurrence of certain events via the sensors` two interrupt pins. The corres-
ponding registers of the BMA222 can easily be set and read-out via the digital sensor interface.
Headquarters
Bosch Sensortec GmbH Gerhard-Kindler-Strasse 872770 Reutlingen · Germany Telephone +49 7121 3535 900Fax +49 7121 3535 909
contact@https://www.wendangku.net/doc/3d4910240.html, https://www.wendangku.net/doc/3d4910240.html,
| Bosch Sensortec | BMA222
2Data & Specification subject to change without notice
Doc.-Number: BST-BMA222-FL000-02 / Version_1.1_012011
? Bosch Sensortec GmbH reserves all rights in the event of industrial property rights. We reserve all rights of disposal such as copying and passing on to third par-ties. BOSCH and the symbols are registered trademarks of Robert Bosch GmbH, Germany.
The BMA222 features I 2C and SPI (3-wire/4-wire) dig-tal serial interfaces. Sensor parameters, like g-ranges or low-pass filter settings, and also all interrupt engi-ne settings can be easily programmed via the digital interfaces.
Integrated interrupt engine
One of the key elements of the BMA222 is the enhan-ced intelligent interrupt engine that gives the hard- and software designer full control. Various motion detection scenarios can be identified by the BMA222 and signaled to the system via two interrupt pins. The interrupt sources can be freely mapped to either of the two interrupt pins.
Following motion detection use case scenarios are
supported by the BMA222 interrupt engine:
Data-ready (e. f g. for processor synchronization)Any-motion (slope) detection (e. f g. for wake-up)Tap sensing (e. f g. for tap-sensitive UI control)
Orientation change recognition (e. f g. for portrait/
landscape & face-up/face-down switching)Flat detection (e. f g. for position sensitive
switching)
Low-g / high-g detection (e. f g. for shock and
free-fall detection)
Interrupt parameters (e. g. switching angles and hysteresis settings for orientation change) can be configured by the designer and thus perfectly support the integration of the BMA222 into the user’s system
environment.
System compatibility
The BMA222 has been designed for best possible fit into modern mobile consumer electronics devices. Besides the ultra-small footprint and lowest power consumption, the BMA222 has very wide ranges for V DD and V DDIO supply voltages. An integrated self-test
feature facilitates overall system reliability.