STCF05 STMicroelectronics, STCF05 Datasheet - Page 18

• Manufacturer Part Number: STCF05
• Description: HIGH POWER WHITE LED DRIVER WITH I2C INTERFACE
• Manufacturer: STMicroelectronics

Specifications of STCF05

• Flash Mode: up to 400 mA
• Torch Mode: up to 120 mA

I²C bus interface
Figure 8.
8.7
Figure 9.
8.8
18/33
A
A
A
R
R
R
S
S
S
T
T
T
T
T
T
M
M
M
S
S
S
B
B
B
ADDRESS
ADDRESS
ADDRESS
DEVICE
DEVICE
DEVICE
7 bits
7 bits
7 bits
Writing to a single register
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. STCF05 supports writing to multiple registers with
incremental addressing. When data is written to a register, the address register is
automatically incremented, so the next data can be sent without sending the device address
and the register address again. See
Writing to multiple register with incremental addressing
Reading from a single register
The reading operation starts with a START bit followed by the 7 bit device address of
STCF05. The 8
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 STCF05 again.
Then the master generates a START bit again and sends the device address followed by the
R/W bit, which is 1 now. STCF05 confirms the receiving of the address + R/W bit by an
L
L
L
S
S
S
B
B
B
W
W
W
W
W
W
R
R
R
R
R
R
T
T
T
E
E
E
S
S
S
A
A
A
R
R
R
I
I
I
/
/
/
T
T
T
T
T
T
A
A
A
C
C
C
K
K
K
M
M
M
S
S
S
B
B
B
M
M
M
S
S
S
B
B
B
ADDRESS OF
ADDRESS OF
ADDRESS OF
REGISTER i
REGISTER i
REGISTER i
ADDRESS
ADDRESS
ADDRESS
DEVICE
DEVICE
DEVICE
7 bits
7 bits
7 bits
th
S
S
S
B
B
B
L
L
L
bit is the R/W bit, which is 0 in this case. STCF05 confirms the receiving of
A
A
A
A
A
A
C
C
C
C
C
C
K
K
K
K
K
K
M
M
M
M
M
M
S
S
S
S
S
S
B
B
B
B
B
B
B
B
B
L
L
L
S
S
S
W
W
W
R
R
R
DATA i
DATA i
DATA i
/
/
/
W
W
W
R
R
R
T
T
T
E
E
E
I
I
I
A
A
A
C
C
C
K
K
K
M
M
M
B
B
B
S
S
S
B
B
B
L
L
L
S
S
S
SDA LINE
SDA LINE
Doc ID 15257 Rev 4
A
A
A
C
C
C
K
K
K
M
M
M
S
S
S
B
B
B
ADDRESS OF
ADDRESS OF
ADDRESS OF
REGISTER
REGISTER
REGISTER
SDA LINE
SDA LINE
DATA i+1
DATA i+1
DATA i+1
Figure 9
L
L
L
S
S
S
B
B
B
A
A
A
C
C
C
K
K
K
below.
M
M
M
L
L
L
S
S
S
B
B
B
S
S
S
B
B
B
A
A
A
A
A
A
C
C
C
C
C
C
K
K
K
K
K
K
DATA i+2
DATA i+2
DATA i+2
M
M
M
S
S
S
B
B
B
B
B
B
L
L
L
S
S
S
A
A
A
C
C
C
K
K
K
DATA
DATA
DATA
M
M
M
S
S
S
B
B
B
DATA i+2
DATA i+2
DATA i+2
S
S
S
B
B
B
L
L
L
L
L
L
S
S
S
B
B
B
A
A
A
C
C
C
K
K
K
A
A
A
C
C
C
K
K
K
M
M
M
S
S
S
B
B
B
O
O
O
S
S
S
T
T
T
P
P
P
DATA i+n
DATA i+n
DATA i+n
L
L
L
S
S
S
B
B
B
STCF05
A
A
A
C
C
C
K
K
K
S
S
S
O
O
O
P
P
P
T
T
T