BMA250 Bosch Sensortec, BMA250 Datasheet - Page 56

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
For single byte read as well as write operations, 16-bit protocols are used. The BMA250 also
supports multiple-byte read operations.
In SPI 4-wire configuration CSB (chip select low active), SCK (serial clock), SDI (serial data
input), and SDO (serial data output) pins are used. The communication starts when the CSB is
pulled low by the SPI master and stops when CSB is pulled high. SCK is also controlled by SPI
master. SDI and SDO are driven at the falling edge of SCK and should be captured at the rising
edge of SCK.
The basic write operation waveform for 4-wire configuration is depicted in figure 11. During the
entire write cycle SDO remains in high- impedance state.
The basic read operation waveform for 4-wire configuration is depicted in figure 12:
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.
CSB
SCK
SDI
SDO
CSB
SCK
SDI
SDO
R/W
R/W
Figure 11: 4-wire basic SPI write sequence (mode ´11´)
Figure 12: 4-wire basic SPI read sequence (mode ´11´)
AD6
AD6
AD5
AD5
AD4
AD4
Page 56 / not for publishing
AD3
AD3
AD2
AD2
Data sheet
BMA250
AD1
AD1
AD0
AD0
tri-state
Z
DI7
DO7 DO6
DI6
DI5
DO5 DO4 DO3 DO2 DO1 DO0
DI4
DI3
DI2
DI1
Bosch Sensortec
DI0
03 March 2011
tri-state

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