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TCA9536: The circuit setup and the voltage of a port when the specific circuit situation

Wataru Tsukada
Prodigy 50 points
Part Number: TCA9536

Dear Experts,

For the following virtual situation, I would like to confirm two items.

# 1. VCC Input 1.8V, SDA and SCL are pulled up to 3.3V. In my understanding, TCA9536 is acceptable in this situation. Is it correct?
# 2. The P0 output goes low.  Then the voltage of P0 line will be under the 0.013V (Almost GND). Is it correct?

I would appreciate it if you could answer it.

Regards

  • +1
    TI__Guru 63140 points

    Hi Tsukada-san,

    Wataru Tsukada said:
    # 1. VCC Input 1.8V, SDA and SCL are pulled up to 3.3V. In my understanding, TCA9536 is acceptable in this situation. Is it correct?

    Yes, you can technically do this. You may see higher leakage current through the SDA/SCL pins but this shouldn't cause damage to our device. 

    Wataru Tsukada said:
    # 2. The P0 output goes low.  Then the voltage of P0 line will be under the 0.013V (Almost GND). Is it correct?

    The NFET on the p-port would be operating in the linear region of operation. The Ron would shift depending on the current supplied to it and the voltage on the gate of the driver (NFET in this situation).  Figure 6-11 shows the VoL curve across temperature and current draw. Based on the graph, I would say you're safe to say the VoL would be below 0.1V at a current draw of about 0.33mA.

    -Bobby

  • 0 in reply to BOBBY
    Prodigy 50 points

    Thank you for your reply Bobby-san. Regarding the #2, I was able to understand it in more detail in your explanation.