Datasheet

Bosch Sensortec

| BMI088 Data sheet

35 |

Modifications reserved | Data subject to change without notice

Document number: BST-BMI088-DS001-1

Revision_1.3_05201

This means that – in contrast to the description in section 6.1.1 – a single byte read operation requires

to read 2 bytes in burst mode, of which the first received byte can be discarded, while the second byte

contains the desired data.

The same applies to burst-read operations. For example, to read the accelerometer values in SPI mode,

the user has to read 7 bytes, starting from address 0x12 (ACC data). From these bytes the user must

discard the first byte and finds the acceleration information in byte #2 – #7 (corresponding to the content

of the addresses 0x12 – 0x17).

The data bits are used as follows:

• Bit #0: Read/Write bit. When 0, the data SDI is written into the chip. When 1, the data

SDO from the chip is read.

• Bit #1-7: Address AD(6:0).

• Bit #8-15:

o When in write mode, these are the data SDI, which will be written into the

address.

o When in read mode, these bits contain unpredictable values, and the user has

to read Bit #16-23 to get the actual data from the reading address.

6.2 Inter-Integrated Circuit (I²C)

The I²C bus uses SCL (= SCx pin, serial clock) and SDA (= SDx pin, serial data input and output) signal

lines. Both lines are connected to VDDIO externally via pull-up resistors so that they are pulled high

when the bus is free.

The I²C interface of the BMI088 is compatible with the I²C Specification UM10204 Rev. 03 (19 June

2007), available at http://www.nxp.com. The BMI088 supports I²C standard mode and fast mode, only

7-bit address mode is supported.

The default I²C addresses are:

 Accelerometer:

 SDO1 pin pulled to ‘GND’: 0011000b (0x18)

 SDO1 pin pulled to ‘VDDIO’: 0011001b (0x19)

 Gyroscope:

 SDO2 pin pulled to ‘GND’: 1101000b (0x68)

 SDO2 pin pulled to ‘VDDIO’: 1101001b (0x69)

The timing specification for I²C of the BMI088 is given in table 13: