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Bosch Sensortec

BMA220

Digital, triaxial acceleration sensor

General description

The BMA220 is an ultra small triaxial, low-g accelera-

tion sensor with digital interfaces, aiming for low-

power consumer market applications.

The BMA220 allows measurement of accelerations

in 3 perpendicular axes and thus senses tilt, motion,

shock and vibration in cell phones, handhelds, com-

puter peripherals, man-machine interfaces, virtual

reality features and game controllers.

BMA220 target applications

Display prole switching (e.g.portrait/landscape) f

Tap sensing function f

Menu scrolling f

Gaming f

Advanced power management for mobile devices f

Shock detection f

Sensor operation

With its size of only 2 mm x 2 mm the BMA220 repre-

sents a new generation of digital acceleration sen-

sors. The BMA220 integrates a multitude of features

that facilitates its use especially in the area of motion

detection applications, such as device orientation

detection, gaming, HMI and menu browser control.

The BMA220 is highly congurable in order to give

the designer full exibility when integrating the sen-

sor into his system. All features can be set by soft-

ware via the digital interface. This implies also that

even once a hardware platform with the BMA220

exists, it can be modied by software in order to

expand the capabilities and use cases.

As already introduced with the successful BMA150

and SMB380 digital acceleration sensors, also for

the BMA220 the g-ranges, bandwidths and interrupt

parameters can be user programmed via the serial

digital interface. Here the user can choose between

I2C and SPI (3-wire/4-wire) interface modes.

Key features BMA220

User programmable g-range and bandwidth f

Low-power consumption f

SPI (3-wire/4-wire) and I²C interface f

User programmable interrupt engine f

Ultra-low-power auto-wake-up mode f

Self-test capability f

Ultra small package f

RoHS compliant, halogen-free f

Technical data

preliminary

BMA220

Sensitivity axes

Measurement range

Sensitivity

(calibrated)

Resolution

Nonlinearity

Zero-g offset

Bandwidth

Digital input / output

Supply voltage

I/0 supply voltage

Temperature range

LGA package

x/y/z

±2 g, ±4 g, ±8 g, ±16 g

(switchable via SPI/I2C)

2 g: 16 LSB/g

4 g: 8 LSB/g

8 g: 4 LSB/g

16 g: 2 LSB/g

6 bit 62.5 mg

(±2 g range)

± 2 % F S

±95 mg

1 kHz ... 32 Hz

(switchable via SPI/I²C)

SPI & I²C, interrupt pin

1.8 V

1.62 V ... 3.6 V

-40°C … +85°C

2 mm x 2 mm x 0.98 mm

Data & Specication subject to change without notice Doc.-Number: BST-BMA220-FL000-01 / Version_1.2_082010

| Bosch Sensortec | BMA220

ties. BOSCH and the symbols are registered trademarks of Robert Bosch GmbH, Germany.

Headquarters

Bosch Sensortec GmbH

Gerhard-Kindler-Strasse 8

72770 Reutlingen · Germany

Telephone +49 7121 3535 900

Fax +49 7121 3535 909

contact@bosch-sensortec.com

www.bosch-sensortec.com

One of the key elements of the BMA220 is the

intelligent interrupt engine that gives the hard- and

software designer full control. Various motion detec-

tion scenarios can be identied by the BMA220 and

signaled to the system via a simple interrupt pin.

By using the digital serial interface, the exact details of

the motion event that triggered the interrupt can

be read-out.

Following motion detection use case scenarios are

supported by the interrupt engine:

Any-motion (slope) detection f

Tap sensing f

Orientation change recognition f

Low-g / high-g detection f

Data-ready f

Self-wake-up f

The interrupts can be conveniently congured by the

user and thus perfectly support the integration of the

BMA220 into the user’s system environment.

Another important feature of the BMA220 accelera-

tion sensor is the power management module. This

module allows optimizing the sensor’s power con-

sumption in-line with the specic user requirements.

Thus, it is not necessary to operate the sensor at full

power for all application scenarios all the time. For

some use cases the power consumption drastically

shrinks to just a fraction of what would be required in

full performance mode.

Moreover this feature of the BMA220 allows for an

intelligent system power management and thus signi-

cant reduction of the whole system’s power con-

sumption. In particular, this helps increasing battery

life-time of any kind of mobile device.

In the unique „dedicated I/O“ modes the BMA220 can

be operated as a stand-alone device without requiring

a µController.

No.

Name Function

1SDO SPI serial data output

2SDx I2C / SPI serial data in/out

(SDI, SDA, SDO)

3 VDDIO I/O supply voltage

(1.62 … 3.6V)

4VDDD Digital supply voltage (1.8V)

5INT Interrupt output

6DNC Do not connect!

7 VDDA Analog supply voltage

8GND Shared ground

9GND Shared ground

10 CSB SPI chip select

11 PS I2C / SPI select pin

12 SCK SCL (I2C serial clock)

SCK (SPI serial clock)

BMA220 Pin conguration (top view)