STCF03I Datasheet, PDF (17/33 Pages) STMicroelectronics – High power white LED driver with I2CTM interface

Introduction
STCF03I
Table 8. Interface protocol
Device address + R/W bit
Register address
Data
76543210
76543210
76543210
SM
TS
AB
R
T
L RAM
SWC S
B
KB
L AM
SCS
BKB
LAS
SCT
BKO
P
7.8
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^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 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 Figure 8 below.
Figure 8. Writing to a single register
W
DEVICE
R
ADDRESS
I
7 bits
T
E
ADDRESS OF
REGISTER
DATA
SM
TS
AB
R
T
L RAM
S / CS
BWK B
SDA LINE
L AM
SCS
BKB
7.9
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Interface protocol
The interface protocol is composed of (Table 8):
- 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)
LAS
SCT
BKO
P