Bosch MAN-REG-X-08 Especificaciones descargar pdf (Pagina 24)

Data sheet

BMA220

Page 24

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.

5.6 Orientation recognition

The orientation recognition feature informs on an orientation change of the sensor with respect

to the gravitational field vector g. The measured acceleration vector components with respect to

the gravitational field look as follows.





[with respect to graviational field vector g (black dot = pin 1 identifier)]

Figure 8: Definition of acceleration-vector components

acc_x = 1g·sin·cos

acc_y = −1g·sin·sin

acc_z = 1g·cos

→ acc_y/acc_x = −tan

The output register is called orient and defined in the following way:

‘0xx’ upward looking (z>0):

‘000’ portrait upright (315°<<45°) → |acc_y/acc_x|<1 && acc_x>0

‘001’ portrait upside down (135°<<225°) → |acc_y/acc_x|<1 && acc_x<0

‘010’ landscape left (45°<<135°) → |acc_y/acc_x|>1 && acc_y<0

‘011’ landscape right (225°<<315°) → |acc_y/acc_x|>1 && acc_y>0

‘1xx’ downward looking (z<0), xx as before

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Bosch MAN-REG-X-08 Especificaciones Pagina 24