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Which of the following are two most commonly used industry standards for interchip serial communications?

Which of the following are two most commonly used industry standards for interchip serial communications? Correct Answer I2C & SPI

Serial peripheral interface (SPI) and inter-integrated circuit (I2C) are the two standard synchronous serial protocols that are widely used and accepted for serial communication

Inter Integrated Circuit (I2C):

  • I2C is a serial communication protocol. It provides good support to the slow devices, for example, EEPROM, ADC, and RTC etc.
  • 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 is basically a two-wire communication protocol. It uses only two-wire for communication. In which one wire is used for the data (SDA) and other wire is used for the clock (SCL).

Advantages of I2C

  • It is the synchronous communication protocol, so no need of precise oscillators for the master and slave.
  • It requires only two-wire, one wire for the data (SDA), and other wire for the clock (SCL).
  • In I2C bus, each device on the bus is independently addressable.
  • It provides the flexibility to the user to select the transmission rate as per the requirements.

Serial peripheral interface (SPI):

  • ​The serial peripheral interface is four wire-based full-duplex communication protocol these wire generally known as MOSI (master out slave in), MISO (master in slave out), SCL (a serial clock which produces by the master) and SS (slave select line which use to select specific slave during the communication).
  • SPI is supported only multi-slave does not support multi-master and slaves are selected by the slave select signal.
  • In SPI during the communication data is shifted out from the master and shifted into the slave vice- versa through the shift register.

​Advantages of SPI:

  • There is no start and stop bits, so the data can be streamed continuously without interruption.
  • It supports full-duplex.
  • No need for precision oscillators in slave devices as it uses a master’s clock.
  • Higher data transfer rate than I2C (almost twice as fast).
  • Simple software implementation.

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