3-AXIS ACCELEROMETER DIGITAL I/F

BMA250

Manufacturer Part NumberBMA250
Description3-AXIS ACCELEROMETER DIGITAL I/F
ManufacturerBosch Sensortec
Series-
BMA250 datasheets
 

Specifications of BMA250

Featured ProductBMA250 - Digital, Triaxial Acceleration SensorAxisX, Y, Z
Acceleration Range±2g, 4g, 8g, 16gSensitivity256LSB/g, 128LSB/g, 64LSB/g, 16LSB/g
Voltage - Supply1.62 V ~ 3.6 VOutput TypeI²C™, SPI™
Bandwidth8Hz ~ 1kHzInterfaceI²C, SPI
Mounting TypeSurface MountPackage / Case12-VQFN
Lead Free Status / Rohs StatusLead free / RoHS CompliantFor Use With828-1024 - BMA250 DAUGHTERCARD FOR DEV KIT
Other names828-1023-2  
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Page 30/74

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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.
(0x2C)
orient_mode
For each orientation mode the (0x0C) orient bits have a different meaning as shown in table 18
to table 20:
Table 18: Meaning of the (0x0C) orient bits in symmetrical mode
(0x0C)
Name
orient
x00
portrait upright
x01
portrait upside down
x10
landscape left
x11
landscape right
Table 19: Meaning of the (0x0C) orient bits in high-asymmetrical mode
(0x0C)
Name
orient
x00
portrait upright
x01
portrait upside down
x10
landscape left
x11
landscape right
Rev. 1.0
© Bosch Sensortec GmbH reserves all rights even in the event of industrial property rights. We reserve all rights of disposal such
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.
BMA250
Data sheet
Table 17: Orientation mode settings
Orientation Mode
00b
symmetrical
01b
high-asymmetrical
10b
low-asymmetrical
11b
symmetrical
Angle
315° <  < 45°
135° <  < 225°
45° <  < 135°
225° <  < 315°
Angle
297° <  < 63°
117° <  < 243°
63° <  < 117°
243° <  < 297°
Page 30 / not for publishing
Bosch Sensortec
Condition
|acc_y| < |acc_x| -
‘hyst’
and acc_x -
‘hyst’’
≥ 0
|acc_y| < |acc_x| -
‘hyst’
and acc_x +
‘hyst’
< 0
|acc_y| ≥ |acc_x| +
‘hyst’
and acc_y < 0
|acc_y| ≥ |acc_x| +
‘hyst’
and acc_y ≥ 0
Condition
|acc_y| < 2·|acc_x| -
‘hyst’
and acc_x -
‘hyst’
≥ 0
|acc_y| < 2·|acc_x| -
‘hyst’
and acc_x +
‘hyst’
< 0
|acc_y| ≥ 2·|acc_x| +
‘hyst’
and acc_y < 0
|acc_y| ≥ 2·|acc_x| +
‘hyst’
and acc_y ≥ 0
03 March 2011