SMB380 Jennic, SMB380 Datasheet - Page 36

• Manufacturer Part Number: SMB380
• Description: Smb380 Triaxial Acceleration Sensor
• Manufacturer: Jennic

4.2.1 I²C protocol:
The SMB380 I²C slave address is coded on 7 bits (0111000b=38h) fixed by a metal option.
Thus I²C write address is 01110000b (=70h), read address is 01110001b (=71h).
After a start condition, the slave address + RW bit must be send. If the slave address does not
match with SMB380 there is no acknowledgement and the following data transfer will not affect
the chip. If the slave address corresponds to SMB380 it will acknowledge (pull SDA down during
9th clock pulse) and data transfer is enabled. The 8th bit RW sets the chip in read or write
mode, RW=1 for reading, RW=0 for writing.
After slave address and RW bit, the master sends 1 control byte: the 7-bit register address and
one dummy bit.
When SMB380 is accessed in write mode, sequences of 2 bytes (= 1 control byte to define
which address will be written and 1 data byte) must be sent:
Figure 15: I²C multiple write protocol
Rev. 1.3
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7211RB11
Start
S
0
. Specifications are subject to change without notice.
1
Slave Adress
1
1
0
0
0
RW ACK
0
…
Triaxial acceleration sensor
X
X
Preliminary Data Sheet
0
0
0
0
SMB380
Page 36
Register adress (0Fh)
Register adress (09h)
Control byte
Control byte
0
0
1
1
0
1
0
1
1
1
ACK
ACK
X
X
X
X
Register data - adress 09h
Register data - adress 0Fh
X
X
Data byte
Data byte
X
X
Bosch Sensortec
18-September-2007
X
X
X
X
X
X
X
X
ACK
ACK Stop
…
P