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Bosch Sensortec | BMA456 Data Sheet

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Modifications reserved | Data subject to change without notice

Document number: BST-BMA456-DS000-08

Revision_3.5_032025

Setup mode (AUX_IF_CONF.aux_manual_en =0b1)

Through the primary interface the auxiliary sensor may be accessed using indirect addressing through

the AUX_* registers. AUX_RD_ADDR and AUX_WR_ADDR define the address of the register to

read/write in the auxiliary sensor register map and triggers the operation itself, when the auxiliary

sensor interface is enabled through PWR_CTRL.aux_en.

For reads, the number of data bytes defined in AUX_IF_CONF.aux_rd_burst are read from the

auxiliary sensor and written into the BMA456 Register DATA_0 to DATA_7. For writes only single bytes

are written, independent of the settings in AUX_IF_CONF.aux_rd_burst. The data for the I2C write to

auxiliary sensor must be stored in AUX_WR_DATA before the auxiliary sensor register address is

written into AUX_WR_ADDR.

When a read or write operation is triggered by writing to AUX_RD_ADDR and AUX_WR_ADDR,

STATUS.aux_man_op is set and it is reset when the operation is completed. For reads the DATA_0 to

DATA_7 contains the read data, for writes AUX_WR_DATA may be overwritten again.

Configuration phase of the auxiliary sensor.

Example: Read bytes 5 and 6 of auxiliary sensor

End

start

check that no manual

auxiliary sensor

op is running

I2C_READ( STATUS, 1)

STATUS.aux_man_op=1 ?

enable reads/writes, set

burst length to 2

I2C_READ( STATUS, 1)

I2C_WRITE(AUX_IF_CONF, 0b10000001)

Issue I2C read operation

for byte 5+6 on

auxiliary sensor

I2C_WRITE(AUX_RD_ADDR, 0b00000101)

check if data

is already valid

I2C_READ(STATUS, 1)

STATUS<2>=1 ?

burst read the two bytes

I2C_READ(STATUS, 1)

I2C_READ(DATA_0, 2)

Yes

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