BMA250 Bosch Sensortec, BMA250 Datasheet - Page 58

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
6.2 Inter-Integrated Circuit (I²C)
The I²C bus uses SCL (= SCx pin, serial clock) and SDA (= SDx pin, serial data input and
output) signal lines. Both lines are connected to V
are pulled high when the bus is free.
The I²C interface of the BMA250 is compatible with the I²C Specification UM10204 Rev. 03 (19
June 2007), available at http://www.nxp.com. The BMA250 supports I²C standard mode and fast
mode, only 7-bit address mode is supported. For V
output levels are slightly relaxed as described in the Parameter Specification (table 1).
The default I²C address of the device is 0011000b (0x18). It is used if the SDO pin is pulled to
´GND´ or left open (floating). The alternative address 0011001b (0x19) is selected by pulling the
SDO pin to ´V
The timing specification for I²C of the BMA250 is given in table 74:
Table 74: I²C timings
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.
Parameter
Clock Frequency
SCL Low Period
SCL High Period
SDA Setup Time
SDA Hold Time
Setup Time for a
repeated Start Condition
Hold Time for a Start
Condition
Setup Time for a Stop
Condition
Time
Transmission can start
before
DDIO
a
´.
new
Symbol
f
t
t
t
t
t
t
t
t
SCL
LOW
HIGH
SUDAT
HDDAT
SUSTA
HDSTA
SUSTO
BUF
Page 58 / not for publishing
Condition
Data sheet
BMA250
DDIO
DDIO
externally via pull-up resistors so that they
Min
1.3
0.6
0.1
0.0
0.6
0.6
0.6
1.3
= 1.2V to 1.8V the guaranteed voltage
Max
400
Units
kHz
s
Bosch Sensortec
03 March 2011

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