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 55/74

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6.1 Serial peripheral interface (SPI)
The timing specification for SPI of the BMA250 is given in the following table:
Table 73: SPI timing
Parameter
Symbol
Clock Frequency
f
SPI
SCK Low Pulse
t
SCKL
SCK High Pulse
t
SCKH
SDI Setup Time
t
SDI_setup
SDI Hold Time
t
SDI_hold
SDO Output Delay
t
SDO_OD
CSB Setup Time
t
CSB_setup
CSB Hold Time
t
CSB_hold
The following figure shows the definition of the SPI timings given in table 73:
The SPI interface of the BMA250 is compatible with two modes, ´00´ and ´11´. The automatic
selection between [CPOL = ´0´ and CPHA = ´0´] and [CPOL = ´1´ and CPHA = ´1´] is done
based on the value of SCK after a falling edge of CSB.
Two configurations of the SPI interface are supported by the BMA250: 4-wire and 3-wire. The
same protocol is used by both configurations. The device operates in 4-wire configuration by
default. It can be switched to 3-wire configuration by writing ´1´ to (0x34) spi3. Pin SDI is used
as the common data pin in 3-wire configuration.
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
Condition
Min
Max. Load on SDI or
SDO = 25pF
20
20
20
20
Load = 25pF
Load = 250pF,
V
= 2.4V
DDIO
20
40
Figure 10: SPI timing diagram
Page 55 / not for publishing
Bosch Sensortec
Max
Units
10
MHz
ns
ns
ns
ns
30
ns
40
ns
ns
ns
03 March 2011