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TCA9548A: TCA9548A I2C volt range

Mason Liu
Expert 4035 points
Part Number: TCA9548A
Other Parts Discussed in Thread: TCA9534A, , TCA9534, TCA9543A

Hi,

I'd like to confirm this, can TCA9534A support 1.8V as input, 3.3V as output application? 

Thanks.

BR

Mason

  • 0
    TI__Guru 63140 points

    Hi Mason,

    What is the Vcc in your application? If 1.8V then yes it will work.

    If 3.3V then no, 3.3Vx0.7 = 2.31V <--ViH of SDA/SCL. 1.8V <ViH so it would not work.

    -Bobby

  • 0 in reply to BOBBY
    TI__Expert 4035 points

    Hi Bobby,

    Sorry i may mislead you here, i'm asking TCA9548A, and the calculation should come from TCA9534A datasheet, i'm wondering if it applies to TCA9548A? 

    And we haven't decide the Vcc yet.

    Thanks.

    BR

    Mason

  • 0 in reply to Mason Liu
    TI__Guru 63140 points

    The IP between the devices is the same and the same rules still apply. 

    It all depends on what the device Vcc is.

    -Bobby

  • 0 in reply to BOBBY
    TI__Expert 4035 points

    Hi Bobby,

    Got it, i still got one question, in TCA9534A datasheet, why it says 2.7V(VCC) here, this is different from TCA9534 and TCA9548A. 

    Thanks.

    BR

    Mason

  • 0 in reply to Mason Liu
    TI__Guru 63140 points

    Hi Mason,

    Sorry. I thought you were asking about TCA9543A not TCA9534A....

    Are you asking about 1.8V on SDA/SCL and Vcc for 9534A and the p-ports hooked up to something like 3.3V?

    -Bobby

  • 0 in reply to BOBBY
    TI__Guru 63140 points

    I'll be closing this thread since the discussion moved offline. 

    For future readers, the TCA9534A datasheet that Mason screenshot and posted is a typo and should read 5.5V instead of 2.7V.

    Thanks,

    -Bobby