BMA250 Bosch Sensortec, BMA250 Datasheet - Page 16
Manufacturer Part Number
3-AXIS ACCELEROMETER DIGITAL I/F
Specifications of BMA250
BMA250 - Digital, Triaxial Acceleration Sensor
X, Y, Z
±2g, 4g, 8g, 16g
256LSB/g, 128LSB/g, 64LSB/g, 16LSB/g
Voltage - Supply
1.62 V ~ 3.6 V
8Hz ~ 1kHz
Package / Case
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
For Use With
828-1024 - BMA250 DAUGHTERCARD FOR DEV KIT
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.
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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 7: Average current consumption in low-power mode
Page 16 / not for publishing
03 March 2011