BMA255 Bosch Sensortec, BMA255 Datasheet - Page 2

• Manufacturer Part Number: BMA255
• Description: Specifications: Lead Free Status: Lead Free ; RoHS Status: RoHS Compliant
• Manufacturer: Bosch Sensortec

© 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-
programmable interrupt engine. Depending on the
programmable settings the integrated interrupt
engine of the BMA255 signals the occurrence of
certain events via the sensors` two interrupt pins.
The corresponding registers of the BMA255 can easi-
ly be set and read-out via the digital sensor interface
The BMA255 features I
digital, serial interfaces. Sensor parameters, like
g-ranges or low-pass filter settings, and also all inter-
rupt engine settings can be easily programmed via
the digital interfaces.
Integrated interrupt engine
One of the key elements of the BMA255 is the
enhanced intelligent interrupt engine that gives the
hard and software designer full control. Various
motion detection scenarios can be identified by the
BMA255 and signaled to the system via two interrupt
pins. The interrupt sources can be freely mapped to
either of the two interrupt pins.
The following motion detection use case scenarios are
supported by the BMA255 interrupt engine:
f
f
f
f
f
f
f
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 BMA255 into the user’s system
environment.
System compatibility
The BMA255 has been designed for best possible fit
into modern mobile consumer electronics devices.
Besides the ultra-small footprint and lowest power
consumption, the BMA255 has very wide ranges
for V
includes a FIFO buffer with 32 samples depth for each
acceleration axis. An integrated self-test feature
facilitates overall system reliability.
Data & Specification subject to change without notice
2
ties. BOSCH and the symbols are registered trademarks of Robert Bosch GmbH, Germany.
Data-ready (e. g. for processor synchronization)
Any-motion (slope) detection (e. g. for wake-up)
Tap sensing (e. g. for tap-sensitive UI control)
Orientation change recognition (e. g. for portrait/
landscape switching)
Flat detection (e. g. for position sensitive
switching)
Low-g / high-g detection (e. g. for shock and
free-fall detection)
No-motion (e.g. for power saving)
| Bosch Sensortec | BMA255
DD
and V
DDIO
supply voltages. The BMA255 also
2
C and SPI (3-wire/4-wire)
Pin
Pin configuration (top view)
1
2
3
4
5
6
7
8
9
10
11
12
pin #1
pin #1
Name
SDO
SDx
V
NC
INT1
INT2
V
GND
GND
CSB
PS
SCx
DDIO
DD
Doc.-Number: BST-BMA255-FL000-00 / Version_0.1_052011
IO
V
V
SDO
SDO
SDx
SDx
NC
NC
DDIO
DDIO
Description
SPI: serial data output in SPI 4-wire
I
SPI: SDI serial data input in SPI
SPI: SDI serial data I/O
I
Voltage supply for I/Os
Not connected
Interrupt output #1
Interrupt output #2
Voltage supply
Ground for I/O
Ground
Chip select for SPI
Protocol select:
SPI: GND
I
SCK: SPI clock
SCL: I
2
2
2
C: I
C: SDA serial data line
C: V
BMA255
BMA255
INT1
INT1
SCx
SCx
(top view)
(top view)
mode
4-wire mode
in SPI 3-wire mode
pin #12
pin #12
2
2
C address select
DDIO
C clock
Headquarters
Bosch Sensortec GmbH
Gerhard-Kindler-Strasse 8
72770 Reutlingen · Germany
Telephone [phone]
Fax [phone]
[e-mail]
www.bosch-sensortec.com
INT2
INT2
PS
PS
GND
GND
GND
GND
CSB
CSB
V
V
DD
DD
IO
IO
pin #7
pin #7