BMA250 Bosch Sensortec, BMA250 Datasheet - Page 46

3-AXIS ACCELEROMETER DIGITAL I/F

BMA250

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

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

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(0x24) low_hy sets the hysteresis of the low-g interrupt. An LSB of (0x24) low_hy corresponds
to an acceleration difference of 125 mg. Default value of (0x24) low_hy is ´01b´.
(0x24) high_hy sets the hysteresis of the high-g interrupt. The meaning of an LSB of (0x24)
high_hy depends on the selected g-range. It corresponds to an acceleration difference of 125
mg in 2g-range, 250 mg in 4g-range, 500 mg in 8g-range, and 1000mg in 16g-range.
Default value of (0x24) high_hy is ´10b´.
Register (0x25) contains the delay time definition for the high-g interrupt. The physical delay
time can be computed from the content of (0x25) high_dur according to
delay [ms] = [(0x22) high_dur + 1] • 2 ms. Possible delay times range from 2 ms to 512 ms.
Default value of (0x25) high_dur is 0x0F, corresponding to a delay of 32 ms.
Register (0x26) contains the threshold definition for the high-g interrupt. The meaning of an
LSB of (0x26) high_th depends on the selected g-range. It corresponds to 7.81 mg in 2g-range,
15.63 mg in 4g-range, 31.25 mg in 8g-range, and 62.5 mg in 16g-range.
Default value of (0x26) high_th is 0xC0.
Register (0x27) contains the definition of the number of samples to be evaluated for the slope
interrupt (any-motion detection). The number of samples is N = (0x27) slope_dur + 1.
Default value of (0x27) slope_dur is ´00b´.
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.
Table 49: Threshold definition for the low-g interrupt, register (0x24)
Table 50: Delay time definition for the high-g interrupt, register (0x25)
Table 51: Threshold definition for the high-g interrupt, register (0x26)
Table 52: Samples number definition for the slope interrupt, register (0x27)
reserved
dur<7>
hy<1>
th<7>
high_
high_
high_
Bit 7
Bit 7
Bit 7
Bit 7
reserved
dur<6>
hy<0>
th<6>
high_
high_
high_
Bit 6
Bit 6
Bit 6
Bit 6
reserved
reserved
dur<5>
th<5>
high_
high_
Bit 5
Bit 5
Bit 5
Bit 5
Page 46 / not for publishing
reserved
reserved
dur<4>
th<4>
high_
high_
Bit 4
Bit 4
Bit 4
Bit 4
Data sheet
BMA250
reserved
reserved
dur<3>
th<3>
high_
high_
Bit 3
Bit 3
Bit 3
Bit 3
reserved
dur<2>
th<2>
mode
high_
high_
Bit 2
Bit 2
Bit 2
Bit 2
low_
dur<1>
dur<1>
slope_
hy<1>
th<1>
high_
high_
Bit 1
Bit 1
Bit 1
Bit 1
low_
Bosch Sensortec
03 March 2011
dur<0>
dur<0>
slope_
hy<0>
high_
high_
th<0>
Bit 0
Bit 0
Bit 0
Bit 0
low_

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