Bosch MAN-REG-X-08 Especificaciones descargar pdf (Pagina 25)

Data sheet

BMA220

Page 25

BST-BMA220-DS003-08 | Revision 1.15 | August 2011 Bosch Sensortec

third parties. BOSCH and the symbol are registered trademarks of Robert Bosch GmbH, Germany.

Note: Specifications within this document are subject to change without notice.

Figure 9: Orientation definition and interrupt thresholds with respect to the angle phi 

The criteria for portrait/landscape switching is fulfilled and the interrupt is generated when the

threshold |acc_y/acc_x|=1 is crossed (i.e. 45°, 135°, 225°, 315°). As soon as the interrupt is set,

no new interrupt is generated within the hysteresis level of 0.66<|acc_y/acc_x|<1.66

corresponding to a hysteresis interval of 13% around the threshold.

It is possible to block the orientation detection depending on certain conditions (no orientation

interrupt will be triggered). This orientation interrupt blocking feature is configurable via the

orient_blocking[1:0] bits in the following manner:

 ‘00’  interrupt blocking is completely

disabled.

 ‘01’  no interrupt is generated, when |z|>0.9g OR |x|+|y| < 0.4g OR when the slopes of

the acceleration data exceeds 0.2g (sample-to-sample).

 ‘10’  no interrupt is generated, when |z|>0.9g OR |x|+|y| < 0.4g OR while the slopes of

the acceleration data exceeds 0.3g (sample-to-sample).

 ‘11’  no interrupt is generated, when |z|>0.9g OR |x|+|y| < 0.4g OR while the slopes of

the acceleration data exceeds 0.4g (sample-to-sample).

For all states where interrupt blocking through slope detection is used, the interrupt should be

re-enabled after the slope has been below the threshold for 3 times in a row.

For all states where interrupt blocking is enabled, in order to trigger the interrupt, the orientation

should remain the same (stable) until the timer runs out (for ~100ms). The timer starts to count

when orientation changes between two consecutive samples. If the orientation changes while

timer is still counting, the timer is restarted.

The criteria for switching from upward to downward looking fulfilled and the interrupt is

generated when the threshold z=0g is crossed. As soon as the interrupt is set, no new interrupt

is generated within the hysteresis level of -0.4g<z<0.4g (i.e. 25° tilt around vertical position).

-2

-1.5

-1

-0.5

0.5

1.5

0 45 90 135 180 225 270 315 360

phi

acc_y/acc_x

acc_x/sin(theta)

acc_y/sin(theta)

portrait upright landscape left portrait upside

down

landscape right portrait upright

-2

-1.5

-1

-0.5

0.5

1.5

0 45 90 135 180 225 270 315 360

phi

acc_y/acc_x

acc_x/sin(theta)

acc_y/sin(theta)

portrait upright landscape left portrait upside

down

landscape right portrait upright

1 2 ... 20 21 22 23 24 25 26 27 28 29 30 ... 62 63

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