BMA222 Bosch Sensortec, BMA222 Datasheet - Page 59

• Manufacturer Part Number: BMA222
• Description: 3-AXIS ACCELEROMETER DIGITAL SMD
• Manufacturer: Bosch Sensortec

Specifications of BMA222

• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 828-1025-2

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
t
r
Data sheet
BMA222
Page 59
t
SUS TA
t
HDDAT
t
HIGH
t
f
t
SUDA T
Bosch Sensortec
07 March 2011
t
SUSTO