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STCF06TBR

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P35
STCF06 I²C bus interface
Doc ID 14549 Rev 3 19/35
8.5 Writing to a single register
Writing to a single register starts with a START bit followed by the 7 bit device address of
STCF06. The 8
th
bit is the R/W bit, which is 0 in this case. R/W = 1 means a reading
operation. Then the master waits for an acknowledge from STCF06. Then the 8 bit address
of register is sent to STCF06. 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 STCF06. Then master generates a STOP bit and the
communication is over. See Figure 8 below.
Figure 7. Acknowledge on I²C bus
Table 8. Interface protocol
Device address + R/W bit Register address Data
76543210 76543210 76543210
S
T
A
R
T
M
S
B
L
S
B
R
W
A
C
K
M
S
B
L
S
B
A
C
K
M
S
B
L
S
B
A
C
K
S
T
O
P
Obsolete Product(s) - Obsolete Product(s)
I²C bus interface STCF06
20/35 Doc ID 14549 Rev 3
8.6 Interface protocol
The interface protocol is composed:
- 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)
The Register address byte determines the first register in which the read or write operation
takes place. When the read or write operation is finished, the register address is
automatically increased.
8.7 Writing to multiple registers with incremental addressing
It would be unpractical to send several times the device address and the address of the
register when writing to multiple registers. STCF06 supports writing to multiple registers with
incremental addressing. When the data is written to a register, the address register is
automatically increased, so the next data can be sent without sending the device address
and the register address again. See Figure 9 below.
Figure 8. Writing to a single register
S
T
A
R
T
DEVICE
ADDRESS
7 bits
A
C
K
W
R
I
T
E
M
S
B
L
S
B
R
/
W
A
C
K
ADDRESS OF
REGISTER
DATA
A
C
K
A
C
K
S
T
O
P
M
S
B
M
S
B
L
S
B
L
S
B
SDA LINE
S
T
A
R
T
DEVICE
ADDRESS
7 bits
A
C
K
W
R
I
T
E
M
S
B
L
S
B
R
/
W
A
C
K
ADDRESS OF
REGISTER
DATA
A
C
K
A
C
K
S
T
O
P
M
S
B
M
S
B
L
S
B
L
S
B
S
T
A
R
T
DEVICE
ADDRESS
7 bits
A
C
K
W
R
I
T
E
M
S
B
L
S
B
R
/
W
A
C
K
ADDRESS OF
REGISTER
DATA
A
C
K
A
C
K
S
T
O
P
M
S
B
M
S
B
L
S
B
L
S
B
SDA LINE
Obsolete Product(s) - Obsolete Product(s)
STCF06 I²C bus interface
Doc ID 14549 Rev 3 21/35
8.8 Reading from a single register
The reading operation starts with a START bit followed by the 7 bit device address of
STCF06. The 8
th
bit is the R/W bit, which is 0 in this case. STCF06 confirms the receiving of
the address + R/W bit by an acknowledge pulse. The address of the register which should
be read is sent afterwards and confirmed again by an acknowledge pulse of STCF06 again.
Then the master generates a START bit again and sends the device address followed by the
R/W bit, which is 1 now. STCF06 confirms the receiving of the address + R/W bit by an
acknowledge pulse and starts to send the data to the master. No acknowledge pulse from
the master is required after receiving the data. Then the master generates a STOP bit to
terminate the communication. See Figure 10
8.9 Reading from multiple registers with incremental addressing
Reading from multiple registers starts in the same way like reading from a single register. As
soon as the first register is read, the register address is automatically increased. If the
master generates an acknowledge pulse after receiving the data from the first register, then
Figure 9. Writing to multiple register with incremental addressing
S
T
A
R
T
DEVICE
ADDRESS
7 bits
A
C
K
W
R
I
T
E
M
S
B
L
S
B
R
/
W
A
C
K
ADDRESS OF
REGISTER i
DATA i
A
C
K
A
C
K
S
T
O
P
M
S
B
M
S
B
L
S
B
L
S
B
DATA i+1
A
C
K
L
S
B
DATA i+2
A
C
K
L
S
B
DATA i+2
L
S
B
DATA i+n
A
C
K
M
S
B
M
S
B
M
S
B
M
S
B
M
S
B
A
C
K
L
S
B
SDA LINE
S
T
A
R
T
DEVICE
ADDRESS
7 bits
A
C
K
W
R
I
T
E
M
S
B
L
S
B
R
/
W
A
C
K
ADDRESS OF
REGISTER i
DATA i
A
C
K
A
C
K
S
T
O
P
M
S
B
M
S
B
L
S
B
L
S
B
DATA i+1
A
C
K
L
S
B
DATA i+2
A
C
K
L
S
B
DATA i+2
L
S
B
DATA i+n
A
C
K
M
S
B
M
S
B
M
S
B
M
S
B
M
S
B
A
C
K
L
S
B
S
T
A
R
T
DEVICE
ADDRESS
7 bits
A
C
K
W
R
I
T
E
M
S
B
L
S
B
R
/
W
A
C
K
ADDRESS OF
REGISTER i
DATA i
A
C
K
A
C
K
S
T
O
P
M
S
B
M
S
B
L
S
B
L
S
B
DATA i+1
A
C
K
L
S
B
DATA i+2
A
C
K
L
S
B
DATA i+2
L
S
B
DATA i+n
A
C
K
M
S
B
M
S
B
M
S
B
M
S
B
M
S
B
A
C
K
L
S
B
SDA LINE
Figure 10. Reading from a single register
S
T
A
R
T
DEVICE
ADDRESS
7 bits
A
C
K
W
R
I
T
E
M
S
B
L
S
B
R
/
W
ADDRESS
OF
REGISTER
A
C
K
M
S
B
L
S
B
S
T
A
R
T
A
C
K
R
/
W
R
E
A
D
DEVICE
ADDRESS
7 bits
DATA
L
S
B
S
T
O
P
N
O
A
C
K
SDA LINE
S
T
A
R
T
DEVICE
ADDRESS
7 bits
A
C
K
W
R
I
T
E
M
S
B
L
S
B
R
/
W
ADDRESS
OF
REGISTER
A
C
K
M
S
B
L
S
B
S
T
A
R
T
A
C
K
R
/
W
R
E
A
D
DEVICE
ADDRESS
7 bits
DATA
L
S
B
S
T
O
P
N
O
A
C
K
SDA LINE
Obsolete Product(s) - Obsolete Product(s)
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STCF06TBR

Mfr. #:
Buy STCF06TBR
Manufacturer:
STMicroelectronics
Description:
LED Lighting Drivers 1.5A WHITE LED DRVR
Lifecycle:
New from this manufacturer.
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