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Preliminary Datasheet
SMB365
Three-axis accelerometer
Bosch Sensortec
3.2
SPI Protocol
The used protocol corresponds to the standard SPI mode 3.
SPI Memory Write cycle description
CSB
SCK
MOSI
MISO
R/W
A5
A4A3A2
A1
A0
XX
XXXXX
A6 .. A0 :
7 Address bits
D7 .. D0 :
8 Data bits
SPI Memory Read cycle description (divided in two SPI cycles due to EEPROM read access time)
CSB
SCK
MOSI
MISO
R/W
A5A4A3A2A1
A0
HiZ
A6 .. A0 :
7 Address bits
D7 .. D0 :
8 Data bits
D7
D6
D5
D4
D3
D2
X
SCK frequency : 8 MHz max.
X
SPI Acceleration/Temperature Read cycle description
CSB
SCK
MOSI
MISO
HiZ
D1
D0
A6
A6
HiZ
R/W
A5A4
A3A2
A1
A0
A6
D7
D6
D5
D7
D6
D5
D4
D3
D2
D1
R/W
A5A4A3A2A1
A0
HiZ
A6 .. A0 :
7 Address bits
D7 .. D0 :
8 Data bits
X
D0
A6
EM/WIL 08/10/03
HiZ
X
D4
D3
D2
D1
D0
HiZ
Due to the standard 16-bit protocol, the digital codes for the acceleration values must be read by two
successive SPI cycles. The user has to read the 7 MSB first and then the 3 LSB. It is also possible to
read only the 7 MSB.
The 3 LSB are protected in such a way that during the read-out of the 7 MSB the LSB are not changed or
updated. The update of the LSB does not take place before the MSB are read again. Therefore it cannot
happen that a mixed acceleration value is read.
Rev. 1.2
Page 6
© 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.
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