The voltage levels of I2C are not predefined.
This way we can use the same bus to communicate with multiple devices. When addressed only the slave with that particular address will reply back with the information while the others keep quit. Since there is more than one slave in the bus, the master has to refer to each slave using a different address. Serial Data (SDA): Sends the data to and from between the Master and slave.Īt any given time only the master will be able to initiate the communication.
Serial Clock (SCL): Shares the clock signal generated by the master with the slave The complete communication takes place through these two wires namely, Serial Clock (SCL) and Serial Data (SDA). The advantage of I2C communication is that more than one slave can be connected to a Master. Communication should and will always occur between two a Master and a Slave. Here one device is called a master and the other device is called as slave. As said earlier it has two wires, these two wires will be connected across two devices. I2C communication was first introduced by Phillips. It has only two wires to share information out of which one is used for the cock signal and the other is used for sending and receiving data. I2C is a synchronous communication protocol meaning, both the devices that are sharing the information must share a common clock signal. It is normally denoted as I2C or I squared C or even as 2-wire interface protocol (TWI) at some places but it all means the same.
The term IIC stands for “ Inter Integrated Circuits”. Let’s focus on the I2C part for now since that is what we are going to learn in this tutorial. Each communication protocol has its own advantage and disadvantage. At some stage of time it has to communicate to other devices to share information, there are many different types of communication protocols to share these information’s, but the most used ones are USART, IIC, SPI and CAN. In the vast system of embedded applications, no microcontroller can perform all the activities by itself. Since now, we have covered the basics we can get into more interesting stuff like the communication portal. If you have been following our MSP430 tutorials then you would have noticed we have already covered wide a range of tutorials on this microcontroller starting from the very basics. MSP430 is a powerful platform provided by Texas Instruments for embedded projects, its versatile nature has made it to find ways into many applications and the phase is still going.
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