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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Table 7: Average current consumption in low-power mode
4.4 Sensor data
4.4.1 Acceleration data
The width of acceleration data is 10 bits given in two´s complement representation. The 10 bits
for each axis are split into an MSB upper part (one byte containing bits 9 to 2) and an LSB lower
part (one byte containing bits 1 and 0 of acceleration and a (0x02, 0x04, 0x06) new_data flag).
Reading the acceleration data registers shall always start with the LSB part. The content of an
MSB register is updated by reading the corresponding LSB register (shadowing procedure). The
shadowing procedure can be disabled (enabled) by writing ´1´ (´0´) to the bit shadow_dis. With
disabled shadowing, the content of both MSB and LSB registers is updated by a new value
immediately. Unused bits of the LSB registers are fixed to 0. The (0x02, 0x04, 0x06) new_data
flag of each LSB register is set if the data registers are updated, it is reset if either the
corresponding MSB or LSB part is read.
Two different streams of acceleration data are available, unfiltered and filtered. The unfiltered
data is sampled with 2kHz. The sampling rate of the filtered data depends on the selected filter
bandwidth; it is twice the bandwidth. Which kind of data is stored in the acceleration data
registers depends on bit (0x13) data_high_bw. If (0x13) data_high_bw is ´0´ (´1´), then filtered
(unfiltered) data is stored in the registers. Both data streams are separately offset-compensated.
Both kinds of data can be processed by the interrupt controller.
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
Sleep phase
Average
duration
current
consumption
0.5ms
100.5 μA
1ms
78.8 μA
2ms
55.0 μA
4ms
34.5 μA
6ms
25.2 μA
10ms
16.4 μA
25ms
7.4 μA
50ms
4.0 μA
100ms
2.3 μA
500ms
0.9 μA
1s
0.7 μA
Page 16 / not for publishing
Bosch Sensortec
03 March 2011