Bosch MAN-REG-X-08 Specifications download pdf (Page 14)

Data sheet

BMA220

Page 14

BST-BMA220-DS003-08 | Revision 1.15 | August 2011 Bosch Sensortec

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.

4.3 Data registers

4.3.1 Acceleration data read-out

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

C) through

0x04 (SPI) / 0x08 (I

C). 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%.

Table 7: Acceleration register content

Decimal value

Acceleration

(in 2g range mode)

+ 31 + 1.94g

… …

0 0g

… …

-32 - 2.0g

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 1

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 & I

C) and

0x01 (SPI) / 0x02 (I

C).

Table 8: Chip and revision ID

Chip ID Revision ID

0xDD 0x00

1 2 ... 9 10 11 12 13 14 15 16 17 18 19 ... 62 63

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Bosch MAN-REG-X-08 Specifications Page 14