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TCA6416A: Undershoot

Johan Gjellan
Prodigy 380 points
Part Number: TCA6416A

Tool/software:

Hi team,

In the TCA6416A datasheet, it says ‘Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability’.

  • What will happen if it’s under an input voltage below -0.5V on the I2C signals for a certain period? 
  • Is there any document to help explain the mechanism /requirements of the undershoot/overshoot?
  • Also Is there any document to help understand the I2C driver and receiver transistors?

Thanks and best regards,

Johan

  • 0
    TI__Mastermind 47668 points

    Hi Johan,

    DC voltages that go below the abs max rating of -0.5V will subject the device to potential permanent damage. Having short pulses that go below -0.5V is still operating outside abs max conditions. Although not as severe as a DC voltage, the constant pulses may degrade the part over time. 

    Spike pulses on a pull-LOW transition are caused by too strong of a pull down current and significant inductance on the I2C lines which causes the excess ringing. 

    I suggest to weaken the drive strength. Also, adding series resistance will help to dampen the ringing effect (undershoots). Series resistance of ~50 to 100 ohms should show significant improvement. 

    We don't have specific application notes support your questions. Please let me know if I explained this well enough. 

    Regards,

    Tyler