Bosch MAN-REG-X-08 Specifications download pdf (Page 38)

Data sheet

BMA220

Page 38

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.

7. Interfaces

The BMA220 can connect to the host system via three interfaces:

 SPI (3-wire, 4-wire)

 I²C

 Dedicated mode pins (for μC-less- or stand-alone operation, see section

6.1)

In SPI and I²C mode, the BMA220 supports two commands: read and write. The ASIC can be

entirely controlled through those commands. A detailed register to address mapping can be

found in section 4.

It should be noted that there is no way to access internal control or configuration registers while

the BMA220 is in one of its dedicated modes.

In I²C and SPI mode, the internal registers can be accessed via a 7-bit address. Each read- and

write-cycle accesses 8 bits only.

BusSlave2

BusSlave1 BusGateway

SPI

I2C

BusSlave0

I/O Bus

BusAdapter

Figure 14: BMA220 I/O bus concept

The SPI and I²C interfaces are connected to the internal bus gateway which activates either one

of the two interfaces according to the current mode. All internal digital modules accessible via

the serial interfaces are called bus slave. Each slave is connected to the internal bus through a

bus adapter.

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Bosch MAN-REG-X-08 Specifications Page 38