BMA250 Bosch Sensortec, BMA250 Datasheet - Page 59
Manufacturer Part Number
3-AXIS ACCELEROMETER DIGITAL I/F
Specifications of BMA250
BMA250 - Digital, Triaxial Acceleration Sensor
X, Y, Z
±2g, 4g, 8g, 16g
256LSB/g, 128LSB/g, 64LSB/g, 16LSB/g
Voltage - Supply
1.62 V ~ 3.6 V
8Hz ~ 1kHz
Package / Case
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
For Use With
828-1024 - BMA250 DAUGHTERCARD FOR DEV KIT
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.
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Note: Specifications within this document are subject to change without notice.
Acknowledge by slave
Acknowledge by master
Not acknowledge by master
Read / Write
Figure 15: I²C timing diagram
Page 59 / not for publishing
03 March 2011