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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

When FIFO_<sensor x>_data is 0b1 (0b0) data for sensor x is included (not included) in the data part

of the frame.

The fh_ext<1:0> field are used for external tagging.

The data format for data frames is identical to the format defined for the Register (0x0A) DATA_0 to

written into the FIFO. E.g. fh_parm=0b0101 the data in the frame are shown below. If the read burst

length is less than 8 byte, the number of auxiliary sensor data in the frame is reduced to the burst

length.

DATA[X]

Acronym

X=0

AUX_0

copy of register Val(AUX_RD_ADDR) in auxiliary sensor

X=1

AUX_1

copy of register Val(AUX_RD_ADDR )+1 in auxiliary sensor

X=2

AUX_2

copy of register Val(AUX_RD_ADDR )+2 in auxiliary sensor

X=3

AUX_3

copy of register Val(AUX_RD_ADDR )+3 in auxiliary sensor

X=4

AUX_4

copy of register Val(AUX_RD_ADDR )+4 in auxiliary sensor

X=5

AUX_5

copy of register Val(AUX_RD_ADDR )+5 in auxiliary sensor

X=6

AUX_6

copy of register Val(AUX_RD_ADDR )+6 in auxiliary sensor

X=7

AUX_7

copy of register Val(AUX_RD_ADDR)+7 in auxiliary sensor

X=8

ACC_X<7:0> (LSB)

X=9

ACC_X<15:8> (MSB)

X=10

ACC_Y<7:0> (LSB)

X=11

ACC_Y<15:8> (MSB)

X=12

ACC_Z<7:0> (LSB)

X=13

ACC_Z<15:8> (MSB)

Headerless mode

When the data rates of all enabled sensor elements are identical, the FIFO header may be disabled in

FIFO_CONFIG_1.fifo_header_en.

The headerless mode supports only regular frames. To be able to distinguish frames from each other,

all frames must have the same size. For this reason, any change in configuration that have an impact

to frame size or order of data within a frame will cause an instant flush of FIFO, restarting capturing of

data with the new settings.

If the auxiliary sensor interface is enabled, the number of auxiliary sensor bytes in a FIFO frame is

always AUX_IF_CONF.aux_rd_burst bytes (see chapter 4.8). If the burst length is less than 8,

BMA456 will pad the values read form the auxiliary sensor. E.g. if AUX_IF_CONF.aux_rd_burst=0b01

(2 Bytes), a frame with auxiliary sensor and accelerometer data will look like

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