BMA220 datasheet(14/60 Pages) BOSCH

14 / 60 page

BMA220

Data sheet

Bosch Sensortec

Rev. 1.10

Page 14

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.

4.3 Data registers

4.3.1 Acceleration data read-out

The acceleration data can be read-out through addresses 0x02 (SPI) / 0x04 (I2C) through 0x04

(SPI) / 0x08 (I2C). The acceleration data is in 2’s complement according to the table below.

An efficient way to read out the acceleration data in I²C or SPI mode is the burst-accesses.

During such an access, the BMA220 automatically increments the read address after each byte.

By using this kind of access, the data transferred over the I²C bus can be reduced by up to 50%.

Decimal value Acceleration (in 2g range mode)

+ 31

+ 1.94g

…

-32

- 2.0g

Table 7: Acceleration register content

Per default, the bandwidth of the data being read-out is limited by the internal low-pass filters

according to the filter configuration. However, it is possible to read-out data only 1st order filtered

(1 kHz) even though the internal filters are configured differently.

The reason for this feature is that the interrupt controller may operate on low-bandwidth data

while the external master still needs to operate on high-bandwidth data.

Unfiltered (1kHz high-bandwidth) data can be read-out through the serial interface when the

serial_high_bw bit is set to ‘1’. Per default, filtered data is read-out through the serial

interface.

4.3.2 Chip / revision ID

The chip ID and the revision ID can be read-out through addresses 0x00 (SPI & I2C) and 0x01

(SPI) / 0x02 (I2C).

Chip ID Revision ID

0xDD

0x00

Table 8: Chip and revision ID

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