{"id":2906,"date":"2019-08-05T06:56:30","date_gmt":"2019-08-05T06:56:30","guid":{"rendered":"http:\/\/fastbitlab.com\/?p=2906"},"modified":"2023-09-05T11:53:25","modified_gmt":"2023-09-05T06:23:25","slug":"i2c-introduction-and-difference-with-spi","status":"publish","type":"post","link":"https:\/\/fastbitlab.com\/blog\/i2c-introduction-and-difference-with-spi\/","title":{"rendered":"STM32 I2C Lecture 1 : I2C Introduction and difference with SPI"},"content":{"rendered":"
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I2C Introduction and difference with SPI<\/span><\/h1>\n
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I2C Introduction<\/strong><\/span><\/p>\n

The I2C (inter-integrated circuit) bus interface handles communications between the microcontroller and the serial I2C bus.<\/span><\/p>\n

In other words, I2C is just a protocol to achieve serial data communication between integrated circuits which are very close to each other. It provides excellent support to the slow devices.<\/span><\/p>\n

Structure of the I2C bus system<\/span><\/strong><\/span><\/p>\n

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Figure 1. Structure of the I2C bus system.<\/span><\/figcaption><\/figure>\n

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For example, EEPROM, ADC, and RTC, etc. <\/span><\/p>\n

I2C is not only used with the single board but also used with the other external components which have connected with boards through the cables. I2C protocol details like how data sent, how data should receive, how handshaking should happen between the sender and receiver, error handling is more complicated than the SPI protocol. So, in other words, SPI is a straightforward protocol compared to I2C.<\/span><\/p>\n

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Difference between SPI and I2C protocol: <\/strong><\/span><\/p>\n

I2C and SPI are both bus protocols that allow short-distance, serial data transfer. I2C originates from the Philips semiconductor division, while Motorola created SPI. In electronic devices like smartphones, TVs, and laptops to control peripherals like power management chips, input devices, and DACs  both protocols are commonly used.<\/span><\/p>\n

Specification:<\/span>  <\/strong><\/span><\/span><\/p>\n