The master device is the one that generates the clock signal and initiates communication with slaves. The I 2C bus has devices designated as master devices and slave devices. SMBus is a protocol that is essentially compatible with I 2C with the primary difference being SMBus having a lower maximum frequency, a timeout function, and lower maximum current - the discussion in this article there is therefore highly applicable to SMBus as well. Although the I 2C was invented by Philips Semiconductor (now NXP), many other manufacturers produce ICs that are compatible with or utilize the I 2C communications protocol. This type of communication protocol is very widely used by microcontrollers to transmit data or communicate with devices over short distances. We’ll now explain what this mouthful means.Īs it is synchronous, this means that it has a clock line.
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In a nutshell, it’s a single-ended, synchronous, multi-master, multi-slave, package switched serial communication bus. I 2C (pronounced I-squared-C) stands for Inter-Integrated Circuit.
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We hope you will find this series valuable next time you want to implement a serial communication bus as part of your design At the end of this series, we will conclude by looking at each protocol's advantages and disadvantages.
This series covers some of the more popular protocols. Typical applications include the capture of large amounts of data from data-producing peripherals by microcontrollers. These provide a practical solution to the transfer of data between devices over reasonably short distances. This follows on from the preceding articles where we are looking at some of the different types of Serial Communication Protocols available. In this next installment in our series on serial communications protocols, we’re looking at the popular I 2C protocol.
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