BMA222 Bosch Sensortec, BMA222 Datasheet - Page 29
BMA222
Manufacturer Part Number
BMA222
Description
3-AXIS ACCELEROMETER DIGITAL SMD
Manufacturer
Bosch Sensortec
Specifications of BMA222
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Other names
828-1025-2
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
BMA222E
Manufacturer:
BOSCH/博世
Quantity:
20 000
Part Number:
BMA222E(F)
Manufacturer:
BOSCH/博世
Quantity:
20 000
4.8.7 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 are defined as shown in figure 8.
Therefore, the magnitudes of the acceleration vectors are calculated as follows:
Depending on the magnitudes of the acceleration vectors the orientation of the device in the
space is determined and stored in the three (0x0C) orient bits. These bits may not be reset in
the sleep phase of low-power mode. There are three orientation calculation modes with different
thresholds for switching between different orientations: symmetrical, high-asymmetrical, and
low-asymmetrical. The mode is selected by setting the (0x2C) orient_mode bits as given in table
17.
Rev. 1.0
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as copying and passing on to 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.
orient_mode
(0x2C)
Figure 8: Definition of vector components
acc_x = 1g·sin·cos
acc_y = −1g·sin·sin
acc_z = 1g·cos
→ acc_y/acc_x = −tan
Table 17: Orientation mode settings
00b
01b
10b
11b
Data sheet
BMA222
Page 29
Orientation Mode
high-asymmetrical
low-asymmetrical
symmetrical
symmetrical
Bosch Sensortec
07 March 2011