Specifications

BMA180
Preliminary data sheet
Bosch Sensortec
Rev. 1.0 Page 60 / - proprietary information - 06 March 2009
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Specifications within this document are preliminary and subject to change without notice. Document is not intended for publication.
8.3.2 Start and stop conditions
Data transfer begins by a falling edge on SDI when SCK is at high level, this is the start
condition (S), initiated by the I
2
C bus master. It is stopped with a rising edge on SDI when SCK
is at high level; this is the stop condition (P).
SDI
SCK
Start condition
S P
Stop condition
Figure 12: I
2
C start and stop conditions
8.3.3 Bit transfer
One data bit is transferred during each SCK pulse. The data on the SDI line must remain stable
during the high period of SCK pulses, as any changes at this time would be interpreted as start
or stop conditions. Data is transferred with MSB first.
SDI
SCK
Change of
data allowed
Data line
stable, data
valid
Figure 13: I
2
C, 1 bit transfer