BMA250 Bosch Sensortec, BMA250 Datasheet - Page 59

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

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Figure 15 shows the definition of the I²C timings given in table 74:
The I²C protocol works as follows:
START: Data transmission on the bus begins with a high to low transition on the SDA line while
SCL is held high (start condition (S) indicated by I²C bus master). Once the START signal is
transferred by the master, the bus is considered busy.
STOP: Each data transfer should be terminated by a Stop signal (P) generated by master. The
STOP condition is a low to HIGH transition on SDA line while SCL is held high.
ACK: Each byte of data transferred must be acknowledged. It is indicated by an acknowledge
bit sent by the receiver. The transmitter must release the SDA line (no pull down) during the
acknowledge pulse while the receiver must then pull the SDA line low so that it remains stable
low during the high period of the acknowledge clock cycle.
In the following diagrams these abbreviations are used:
A START immediately followed by a STOP (without SCK toggling from logic “1” to logic “0”) is
not supported. If such a combination occurs, the STOP is not recognized by the device.
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.
SDA
SCL
SDA
S
P
ACKS
ACKM
NACKM
RW
t
BUF
t
HDSTA
Start
Stop
Acknowledge by slave
Acknowledge by master
Not acknowledge by master
Read / Write
t
LOW
Figure 15: I²C timing diagram
Page 59 / not for publishing
t
r
Data sheet
BMA250
t
SUS TA
t
HDDAT
t
HIGH
t
f
t
SUDA T
Bosch Sensortec
03 March 2011
t
SUSTO

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