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TCA9617B accommodating 1.8V on Slave Side?

Amanda Ross95
Intellectual 2740 points
Other Parts Discussed in Thread: TCA9617B, PCA9306

Hey Team,

I have an application that uses a 2V I2C master on the A side and talks to a couple of 1.8V slaves on the B side. It doesn't look like this product (TCA9617B) supports that 1.8V on the B side. Would there be a similar product that you would recommend to accomplish this or would it be acceptable to use a logic level translator to kick down that voltage coming out of the repeater to the slaves?

Thanks so much for your time!

-Amanda Ross

  • 0
    TI__Genius 16510 points
    Hello Amanda,

    With the TCA9617B (and many of our other translators in the family) there is no requirement that the master must be on the A side. The master can be on the B or A side.

    There are some requirements for this device though.
    VCCA > 0.8V
    VCCB > 2.2V
    VCCA < VCCB

    So the TCA9617B will not support the 2V master on the B side.

    Unfortunately, we do not have any translators that will allow the B-side down to 2V.

    2V and 1.8V are pretty close and it might be possible to have the 1.8V I2C used on the MCU as well. The VIL levels should be very close.

    Otherwise, a possible option is to provide an intermediate voltage rail for the translation.

    EX:
    2V --- (2) PCA9306 (1) ---3.3V-- (B) TCA9617B (A) ----1.8V
  • 0 in reply to Jonathan Valdez
    TI__Intellectual 2740 points
    Thanks so much Jonathan! I really appreciate the prompt response!