BMA250 Bosch Sensortec, BMA250 Datasheet - Page 29

• Manufacturer Part Number: BMA250
• Description: 3-AXIS ACCELEROMETER DIGITAL I/F
• Manufacturer: Bosch Sensortec
• Series: -r

Specifications of BMA250

• Featured Product: BMA250 - Digital, Triaxial Acceleration Sensor
• Axis: X, Y, Z
• Acceleration Range: ±2g, 4g, 8g, 16g
• Sensitivity: 256LSB/g, 128LSB/g, 64LSB/g, 16LSB/g
• Voltage - Supply: 1.62 V ~ 3.6 V
• Output Type: I²C™, SPI™
• Bandwidth: 8Hz ~ 1kHz
• Interface: I²C, SPI
• Mounting Type: Surface Mount
• Package / Case: 12-VQFN
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• For Use With: 828-1024 - BMA250 DAUGHTERCARD FOR DEV KIT
• Other names: 828-1023-2

4.8.6.5 Tap sensing in low power mode
In low-power mode, a limited number of samples is processed after wake-up to decide whether
an interrupt condition is fulfilled. The number of samples is selected by bits (0x2B) tap_samp
according to table 16.
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:
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.
Table 16: Meaning of (0x2B) tap_samp
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
tap_samp
(0x2B)
Page 29 / not for publishing
00b
01b
10b
11b
Data sheet
BMA250
Number of
Samples
16
2
4
8
Bosch Sensortec
03 March 2011