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 12/74

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4.2.1 General mode
A defined digital state at the PS pin selects the general mode. Its polarity determines the kind of
interface to be used:
PS = GND
enables the digital SPI interface
PS = V
enables the digital I²C interface
DDIO
PS = float
enables the dedicated mode
4.2.2 Dedicated mode (μC-less or stand-alone mode)
The dedicated mode operates with pre-defined settings of the interrupt engine in order to
generate the motion-triggered interrupt-signals, i.e. bandwidth, sleep time, low-power mode,
threshold, and hysteresis are use case optimized. Nevertheless some minor configurations can
be selected by the user. The dedicated mode is entered if the device is connected according to
table 3. During the start-up / power on sequence the PS pin (#11) must float.
Table 3: Entering and operating dedicated mode
VDDIO
NC
Pin#3
Pin#4
V
NC
DDIO
Depending on the configuration of the other device pins according to table 4 the corresponding
sub-mode of the dedicated mode is entered. In table 4 and table 5 the unshaded entries
represent necessary input values for the corresponding sub-mode selection while the shaded
entries represent corresponding output parameters of the events to be detected.
Table 4: Sub-mode selection and specific outputs of the dedicated mode
Sub-Mode
SDO
Pin#1
Orientation
output
orient1-detect
Tap
output
double-detect
Slope
GND
Table 5 contains state and description details of the parameters introduced in table 4. Unshaded
entries represent input values to be set, shaded entries represent output parameters to be
detected.
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
VDD
GNDIO
Pin#7
Pin#8
V
GND
DD
SDx
INT1
Pin#2
Pin#5
output
output
orient0-detect
orient2-detect
output
GND
single-detect
output
V
DD
motion-detect
Page 12 / not for publishing
Bosch Sensortec
GND
Pin#9
Pin#11
GND
float
INT2
CSB
Pin#6
Pin#10
Pin#12
output
select
flat-detect
orient sleep
select
select
tap type
tap sleep
GND
select
slope sleep
03 March 2011
PS
SCx
GND
V
DD
V
DD