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SPI to I2C bridge

Takashi Yamaguchi
Genius 13300 points

Hi team,

Do we have any devices in our portfolio that can act as a bridge between SPI and I2C?

Regards,

Yamaguchi

  • 0
    Guru 316690 points

    These buses are so different that a general-purpose bridge is not possible.

    Depending on the actual protocols used, it might be possible to program a microcontroller to do this.

  • 0
    TI__Guru 72821 points

    Hi Yamaguchi-san,

    Clemen's comment is correct. To add some additional comments though:

    We don't have a device like this in our portfolio but have seen this request pop up from time to time. I don't foresee us designing a device like this currently as there are some drawbacks:

    • SPI operates much quicker than I2C does
      • This means going from I2C to SPI defeats the purpose of using SPI (faster data rate)
      • Going from SPI to I2C would slow down your throughput and introduce waitting
    • I2C has ACK bits and SPI doesn't (ACKs would be meaningless to a SPI device)
    • SPI is a full duplex but I2C is half duplex

    -Bobby