Handy Tips - I2C Serial Protocol
Also see the
following projects for more information/examples on I2C
Communication;
The name is
an abbreviation for Inter-Integrated
Circuit and is pronounced
I-squared-C
I2C uses only two bidirectional open-collector lines, serial data
(SDA) and serial clock (SCL), pulled up with resistors. The maximum
voltage is +5 V, although +3.3 V systems are common and other
voltages are permitted.
The I2C reference design has a 7-bit address space with 16 reserved
addresses, so a maximum of 112 nodes can communicate on the same
bus. The most common I2C bus modes are the 100
kbit/s
standard mode and the
10 kbit/s
low-speed mode,
but clock frequencies down to zero are also allowed.
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