BMA253
Data sheet
Page 36
Figure 10 shows the typical switching conditions between the four different orientations for the
symmetrical mode i.e. without hysteresis:
poprotrtariatiut purpigrihgtht
landscape left
poprotratriat iutpuspisdiede
down
lalnadnsdcsacpaeperigrihgtht portrait upright
2
1.5
1
0.5
0
0
45
90
135
180
225
270
315
360
-0.5
-1
acc_y/acc_x
acc_x/sin(theta)
acc_y/sin(theta)
-1.5
-2
phi
Figure 10: Typical orientation switching conditions w/o hysteresis
The orientation interrupt is enabled (disabled) by writing ´1´ (´0´) to bit (0x16) orient_en. The
interrupt is generated if the value of (0x0C) orient has changed. It is automatically cleared after
one stable period of the (0x0C) orient value. The interrupt status is stored in the (0x09)
orient_int bit. The register (0x0C) orient always reflects the current orientation of the device,
irrespective of which interrupt mode has been selected. Bit (0x0C) orient<2> reflects the device
orientation with respect to the z-axis. The bits (0x0C) orient<1:0> reflect the device orientation
in the x-y-plane. The conventions associated with register (0x0C) orient are detailed in chapter
6.
BST-BMA253-DS000-01 | Revision 1.0 | August 2015
Bosch Sensortec
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Note: Specifications within this document are subject to change without notice.
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