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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

Sensor Data

Acceleration Data

The width of acceleration data is 16 bits given in two´s complement representation in the registers

DATA_8 to DATA_13. The 16 bits for each axis are split into an MSB upper part and an LSB lower

part. Reading the acceleration data registers shall always start with the LSB part. In order to ensure

the integrity of the acceleration data, the content of an MSB register is locked by reading the

corresponding LSB register (shadowing procedure).

Filter Settings

The accelerometer digital filter can be configured through the Register ACC_CONF.

Note:

Illegal settings in configuration registers will result in an error code in Register ERR_REG. The content

of the data register is undefined, and if the FIFO is used, it may contain no value.

Accelerometer data processing for performance mode

Performance mode is enabled with ACC_CONF.acc_perf_mode=0b1. In this power mode, the

accelerometer data is sampled at equidistant points in the time, defined by the accelerometer output

data rate parameter ACC_CONF.acc_odr. The output data rate can be configured in one of eight

different valid ODR configurations going from 12.5 Hz up to 1600Hz.

The filter bandwidth shows a 3db cutoff frequency shown in the following table:

Table 12: 3dB cutoff frequency of the accelerometer according to ODR with normal filter mode

Accelerometer ODR [Hz] 12.5

100

200

400

800

1600

3dB Cutoff frequency [Hz] 5.06 10.12

20.25

40.5

162 (155

for Z axis)

324

(262 for Z

axis)

684

(353 for Z

axis)

BMA456 Datasheet(PDF) 19 Page - Bosch Sensortec GmbH