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TCA9617A: How to Remove Pedestal with SDA and SCL Low Level

Vayne Li
Intellectual 980 points
Part Number: TCA9617A
Other Parts Discussed in Thread: TCA9803, , TCA9517A, TCA9517, TCA9511A, TCA4307

Tool/software:

Hi Teams,

How to Optimize Pedestal with SDA Low Level？

  • 0
    Guru 316690 points

    By replacing the TCA9617A with a buffer with a completely different architecture, e.g., TCA9803.

  • 0
    TI__Mastermind 47328 points

    Hi Vayne,

    The buffer pedestal is by design. TCA9517 / TCA9517A / TCA9617A/B will have this pedestal offset voltage VOLB. 

    The buffer that CLemens recommended is TCA9803 which requires no PU resistors on B-side to be used. This buffer uses a different architecture and offers a lower VOL. 

    Also consider TCA9511A or TCA4307 hot swap buffers. These devices implement a dynamic offset voltage where the output voltage is a VOS higher than its input. 

    Regards,

    Tyler