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STCF04 数据表(PDF) 21 Page - STMicroelectronics

部件名 STCF04
功能描述  High power white LED SuperCap™ driver with I²C interface
PDF  43 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

STCF04 数据表(HTML) 21 Page - STMicroelectronics

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STCF04
Detailed description
Doc ID 022927 Rev 3
21/43
8.1.15
Reading from a single register
The reading operation starts with a START bit followed by the 7-bit device address of the
STCF04. The 8th bit is the R/W bit, which is 0 in this case. The STCF04 confirms receipt of
the address + R/W bit by an acknowledge pulse. The address of the register that should be
read is sent afterwards and confirmed again by an acknowledge pulse of the STCF04 again.
Then the master generates a START bit again and sends the device address followed by the
R/W bit, which is now 1. The STCF04 confirms receipt 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 11.
8.1.16
Reading from multiple registers with incremental addressing
Reading from multiple registers starts in the same way as reading from a single register. As
soon as the first register is read, the register address is automatically incremented. If the
master generates an acknowledge pulse after receiving the data from the first register, then
reading of the next register can start immediately without sending the device address and
the register address again. The last acknowledge pulse before the STOP bit is not required.
See
Figure 12.
Figure 10.
Writing to multiple registers with incremental addressing
AM11864v1
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 11.
Reading from a single register
AM11865v1
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



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