TLC59208F Datasheet, PDF (19/27 Pages) Texas Instruments – 8-BIT FM+ I2C BUS LED DRIVER

TLC59208F
www.ti.com .................................................................................................................................................................................................. SCLS715 – MARCH 2009
Characteristics of the I²C Bus
The I²C bus is for two-way two-line communication between different devices or modules. The two lines are a
serial data line (SDA) and a serial clock line (SCL). Both lines must be connected to a positive supply via a
pullup resistor when connected to the output stages of a device. Data transfer may be initiated only when the bus
is not busy.
Bit Transfer
One data bit is transferred during each clock pulse. The data on the SDA line must remain stable during the high
period of the clock pulse as changes in the data line at this time will be interpreted as control signals (see
Figure 9).
SDA
SCL
Data Line
Stable;
Data Valid
Change
of Data
Allowed
Figure 9. Bit Transfer
Start and Stop Conditions
Both data and clock lines remain high when the bus is not busy. A high-to-low transition of the data line while the
clock is high is defined as the Start condition (S). A low-to-high transition of the data line while the clock is high is
defined as the Stop condition (P) (see Figure 10).
SDA
SDA
SCL
S
P
SCL
Start Condition
Stop Condition
Figure 10. Start and Stop Conditions
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