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AN50987 - Getting Started with I2C in PSoC® 1 | Cypress Semiconductor

AN50987 - Getting Started with I2C in PSoC® 1

Last Updated: 
Jun 26, 2020

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AN50987 gives an overview of the I2C standard and explains how a PSoC® 1 device handles I2C communications. After reading this application note, you should have an understanding of how I2C works, how to implement it in PSoC 1, and how to choose the correct user module for a design. Example projects demonstrate how to configure PSoC 1 as an I2C master/slave to communicate with other I2C devices on the bus.


Inter-integrated circuit (IIC or I2C) is a common chip-tochip serial communications standard developed by the Philips semiconductor division (now NXP). I2C provides a simple way for ICs to communicate on the same printed circuit board (PCB). I2C consists of a simple physical layer that requires only two pins and minimal external components. One advantage of I2C over a communication standard such as SPI is that it has a built-in communication protocol that allows easy, error-free communication between devices.


12C Protocol PSoC

The following video explains the basics of I2C communication protocol.

use for camtasia screencasts


Example Project
Supported H/W and S/W Supported PSoC1 Devices
PSoC Designer Version H/W Kit CY8C20xxx CY8C21xxx CY8C22xxx CY8C23xxx CY8C24xxx CY8C27xxx CY8C28xxx CY8C29xxx
Yes 5.4 N/A   x23, x34, x45 x45 x33 x23A, x94 x43 x x66

Translated documents are for reference only. We recommend that you refer to the English-language version of a document if you are engaged in development of a design.