ISM330BXTR datasheet(7/150 Pages) STMICROELECTRONICS

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2.4

Sensor fusion low power

A sensor fusion low-power (SFLP) block is available in the ISM330BX for generating the following data based on

the accelerometer and gyroscope data processing:

•

Game rotation vector, which provides a quaternion representing the attitude of the device

•

Gravity vector, which provides a three-dimensional vector representing the direction of gravity

•

Gyroscope bias, which provides a three-dimensional vector representing the gyroscope bias

The SFLP block is enabled by setting the SFLP_GAME_EN bit to 1 of the EMB_FUNC_EN_A (04h) embedded

functions register.

The SFLP block can be reinitialized by setting the SFLP_GAME_INIT bit to 1 of the EMB_FUNC_INIT_A (66h)

embedded functions register.

Table 1. Sensor fusion performance

Parameter

Value

Static accuracy

heading / yaw

0.5 deg. / 5 minutes

pitch

1.5 deg.

roll

1.5 deg.

Low dynamic accuracy

heading / yaw

0.7 deg. / 5 minutes

pitch

0.5 deg.

roll

0.5 deg.

High dynamic accuracy

heading / yaw

5.9 deg. / 5 minutes

pitch

1.6 deg.

roll

1.2 deg.

Calibration time

0.8 seconds(1)

Orientation stabilization time

0.7 seconds

1. Time required to reach steady state

2.5

Tilt detection

The tilt function helps to detect activity change and has been implemented in hardware using only the

accelerometer to achieve targets of both ultralow power consumption and robustness during the short duration of

dynamic accelerations.

The tilt function is based on a trigger of an event each time the device's tilt changes and can be used with

different scenarios.

2.6

Significant motion detection

The significant motion detection (SMD) function generates an interrupt when a ‘significant motion’, that could be

due to a change in device location, is detected. In the ISM330BX device this function has been implemented in

hardware using only the accelerometer.

SMD functionality can be used in location-based applications in order to receive a notification indicating when the

user is changing location.

ISM330BX

Embedded low-power features

DS14588 - Rev 2

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