stcf03i STMicroelectronics, stcf03i Datasheet - Page 17

• Manufacturer Part Number: stcf03i
• Description: High Power White Led Driver With I2ctm Interface
• Manufacturer: STMicroelectronics

Table 8. Interface protocol
7.8
Figure 8.
7.9
17/33
S
A
R
T
T
M
S
B
7
Device address + R/W bit
6
5
Writing to a single register
Writing to a single register starts with a START bit followed by the 7 bit device address of
STCF03I. The 8
operation. Then the master waits for an acknowledge from STCF03I. Then the 8 bit address
of register is sent to STCF03I. It is also followed by an acknowledge pulse. The last
transmitted byte is the data that is going to be written to the register. It is again followed by
an acknowledge pulse from STCF03I. The master then generates a STOP bit and the
communication is over. See
Writing to a single register
Interface protocol
The interface protocol is composed of
- A start condition (START)
- A Device address + R/W bit (read =1 / write =0)
- A Register address byte
- A sequence of data n* (1 byte + acknowledge)
- A stop condition (STOP)
4
S
S
S
A
A
A
R
R
R
T
T
T
T
T
T
3
M
M
M
S
S
S
B
B
B
2
ADDRESS
ADDRESS
ADDRESS
DEVICE
DEVICE
DEVICE
7 bits
7 bits
7 bits
S
B
1
L
th
W
R
0
bit is the R/W bit, which is 0 in this case. R/W = 1 means a reading
A
C
K
B
B
B
L
L
L
S
S
S
W
W
W
M
R
R
R
S
B
7
/
/
/
W
W
W
R
R
R
T
T
T
E
E
E
I
I
I
A
A
A
C
C
C
K
K
K
6
Figure 8
M
M
M
S
S
S
B
B
B
Register address
SDA LINE
SDA LINE
5
ADDRESS OF
ADDRESS OF
ADDRESS OF
REGISTER
REGISTER
REGISTER
4
below.
(Table
3
2
8):
1
S
S
S
B
B
B
L
L
L
A
A
A
A
A
A
C
C
C
C
C
C
K
K
K
K
K
K
S
B
0
L
M
M
M
S
S
S
B
B
B
C
A
K
M
S
B
7
DATA
DATA
DATA
6
5
4
Data
L
L
L
S
S
S
B
B
B
A
A
A
C
C
C
K
K
K
3
S
S
S
O
O
O
P
P
P
T
T
T
2
1
S
B
0
L
C
A
K
O
S
P
T