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TCA9548A: What is

Takeshi Miki
Prodigy 40 points

Part Number: TCA9548A

Dear TI

What is Vo(sw)(Switch output voltage)  ?
For examle ,Vcc =1.8V typ 1.1V .
Is this meaning  that Vol  max become 1.1V??

Takeshi

  • 0
    Guru 323420 points

    Vo(sw) is not relevant for I²C communication.

    There is no VOL because the TCA9548A is an analog switch. The connection between the SCL/SDA pins and any active channel behaves like a resistor for low-level signals; see the RON specification.

  • 0 in reply to Clemens Ladisch
    Prodigy 40 points

    Dear Clemens Ladisch

    Thank you very much for replying me.

    Do you mean Vo = Ron × Io ?

     For example, If Io = 10mA and Vcc= 1.8V ,Vol become 700mV max?

    Takeshi

  • +1 in reply to Takeshi Miki
    TI__Prodigy 480 points

    Hi Takeshi,

    Your output voltage will be input voltage minus the drop that occurs across the switch (Vo = Vi - Ron*I). Turning on the switch is creating a channel for your input signal to travel through. Your output signal's voltage will be largely dependent on your input voltage and equivalent resistance seen at the output with some voltage drop due to the on resistance of the switch. Your system will most likely not have the same current as the test conditions used in the Ron section of the datasheet, so be sure to account for that.

    -Hunter 

  • 0 in reply to Hunter Burnham
    Prodigy 40 points

    Hi Hunter 

    thank you very much for your answer.

    I could understand with you explanation.

    -Takeshi