BMA250 Bosch Sensortec, BMA250 Datasheet - Page 58

• Manufacturer Part Number: BMA250
• Description: 3-AXIS ACCELEROMETER DIGITAL I/F
• Manufacturer: Bosch Sensortec
• Series: -r

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
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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.
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