BMA220 datasheet(13/60 Pages) BOSCH

13 / 60 page

BMA220

Data sheet

Bosch Sensortec

Rev. 1.10

Page 13

13 April 2011

as copying and passing on to third parties. BOSCH and the symbol are registered trademarks of Robert Bosch GmbH, Germany.

Note: Specifications within this document are subject to change without notice. Document is not intended for publication.

4.2 Setting registers

4.2.1 Acceleration range and sensitivity setting

The BMA220 has four different range settings for the full scale acceleration range. In

dependence of the use case always the lowest full scale range with the maximum resolution

should be selected. Please refer to literature to find out, which full scale acceleration range,

which sensitivity or which resolution is the ideal one.

This can be configured via the register bits range[1:0] at address 0x11 (SPI) / 0x22 (SPI).

The following table shows the range bits with corresponding scale and resolution.

range[1:0] Full Scale

Sensitivity

Resolution

Example use case

‘00’

±2g

16 LSB / g

62.5mg / LSB

Orientation recognition

‘01’

±4g

8 LSB / g

125mg / LSB

‘10’

±8g

4 LSB / g

0.25g / LSB

Gaming

‘11’

±16g

2 LSB / g

0.5g / LSB

Shock vibration detection

Table 5: Acceleration resolution

4.2.2 Filter and bandwidth configuration

The BMA220 has a digital filter that can be configured by setting the corresponding register bits

filter_config[3:0] at address 0x10 (SPI) / 0x20 (I

2C). For compatibility reasons the settings

are defined based on BMA120. To always ensure an ideal cut off frequency of the filter the

BMA220 is adjusting the sample rate automatically.

filter_config[3:0]

0x5

0x4

0x3

0x2

0x1

0x0

digital filter cut-off frequency

32Hz

64Hz

125Hz

250Hz

500Hz

1kHz

Table 6: Digital filter configuration

The internal SC-filter has a fix cut-off frequency at 1 KHz. In addition to the internal SC-filter a

digital filter is available which is providing a filtered and an unfiltered data stream for all of the 3

axes of acceleration.

If application specific reasons require a bandwidth configuration <32Hz, please contact your

Bosch Sensortec representative.

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