LM3561 Datasheet, PDF (22/36 Pages) Texas Instruments – LM3561 Synchronous Boost Converter with 600mA High Side LED Driver and I 2 C-Compatible Interface

I²C-Compatible Interface
START AND STOP CONDITIONS
The LM3561 is controlled via an I²C-compatible interface.
START and STOP conditions classify the beginning and end
of the I²C session. A START condition is defined as SDA
transitioning from HIGH to LOW while SCL is HIGH. A STOP
condition is defined as SDA transitioning from LOW to HIGH
while SCL is HIGH. The I²C master always generates the
START and STOP conditions.
FIGURE 12. Start and Stop Sequences
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The I²C bus is considered busy after a START condition and
free after a STOP condition. During data transmission the
I²C master can generate repeated START conditions. A
START and a repeated START condition are equivalent func-
tion-wise. The data on SDA must be stable during the HIGH
period of the clock signal (SCL). In other words, the state of
SDA can only be changed when SCL is LOW. Figure 1 and
Figure 13 show the SDA and SCL signal timing for the I²C-
compatible Bus. See the Electrical Characteristics Table for
timing values.
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