Advertisement
share awesome hardware
1.3inch OLED User Manual
The I2C-bus is for bi-directional, two-line communication between different ICs 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 pull-up resistor. Data transfer may be initiated only when the bus is not busy.
Note: The positive supply of pull-up resistor must equal to the value of V
.
DD1
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
a control signal.
Figure 3: Bit Transfer
(SH1106_V2.3.pdf Chap. I2C-bus Interface)
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).
5
th
Rev 2.4, May 15
2015
Advertisement
