BMA220 datasheet(44/60 Pages) BOSCH

44 / 60 page

BMA220

Data sheet

Bosch Sensortec

Rev. 1.10

Page 44

13 April 2011

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. Document is not intended for publication.

SDA

SCK

Change of

data allowed

Data line

stable, data

valid

Tsudat

Thddat

Figure 21: Waveform diagram for one bit transfer with I²C interface

Parameter

Symbol

Min

Max

Units

DATA hold time

THDDAT

0.9

DATA setup time

TSUDAT

0.1

μs

Table 22: I²C data transfer timing

The first byte of data transmitted after start condition contains the 7-bit address of I²C slave. The

8th bit is an R/W bit which tells whether the master wants to read (R/W = 1) or write (R/W = 0)

data from/to the slave.

Once the slave is addressed, it sends a low active acknowledge bit and accepts the following

data transferred by master. Otherwise it aborts the current data transfer and waits for the start

condition of next data transmission.

I²C write command:

I²C write command only supports one byte writing. The protocol begins with start condition

generated by master, followed by 7bits slave address and a write bit (R/W = 0). The slave sends

an acknowledge bit (ACK = 0) and releases the bus. Then master sends the one byte register

address (only the first 7bits are the valid address bits, the LSB shall be ignored). The slave shall

again acknowledge the transmission and wait for the 8bits data which shall be written to the

specified register address. After slave acknowledges the data byte, master generates a stop

signal and terminates the writing protocol.

Data transferred by Master

Data transferred by Slave

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