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TCA9536: I3C Compatability

AlexWalton42
Expert 8435 points
Part Number: TCA9536

Tool/software:

Hi team

I'm planning to use this legacy I2C devices on a newer-generation I3C bus. In theory the I3C spec should have backwards compatibility support for legacy I2C devices but I'm sure there are some nuances. Are there any concerns?

In specific there are two on my mind:

  1. Do either of these devices use clock-stretching?
  2. Do these devices have a spike filter integrated inside?
  • 0
    Guru 316690 points

    This device never uses clock stretching and has spike filters.

  • 0
    TI__Mastermind 47338 points

    Hi Alex,

    TCA9536 does not have clock stretching. 

    TCA9536 does have 50 ns spike filters as per I2C specifications. IT should filter out the I3C traffic in the push-pull mode. 

    TCA9536 is 1 MHz capable, so the open-drain mode can operate in fast-mode+ (1 MHz). 

    TCA9536 should be able to sit on a mixed I3C bus with no issue. 

    CIO for SCL = 5 pF max

    CIO for SDA = 10pF max

    For I3C spec, it requires <50pF. Not sure why the cap is different between SDA and SCL, but I would keep this in mind when considering the cap budget. 

    Regards,

    Tyler