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TCA6416A – About 5V tolerant I/O ports

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Guru 21045 points
Other Parts Discussed in Thread: TCA6416A

Hi Team,

 

Our customer is studying about 5V tolerant I/O ports.

I understood that the device is not broken if 5V was applied to the port which was set to the input port.

Also, I believe that the device is not broken if 5V was applied to the port which was set to the output port (output is High level).

Is my understanding correct?

 

Regards,

Kanemaru

  • 0
    TI__Mastermind 30260 points

    If a P-port is configured as an output LOW and 5V is applied externally, this will cause a short to ground.

    Although the pin can tolerate 5V, if the current is greater than 25 mA then this could potentially cause damage to the device.

    This is the maximum recommended IOL level on page 12 of the datasheet.

  • 0 in reply to Brian Berner
    Guru 21045 points

    Hi Brian-san,

     

    Thank you for your prompt reply.

    I understood it in the following way.

    So, could you please let me know the behavior of TCA6416A at this case2?

     

    -----------

    [Case1]

    P-port is configured as an output Low (Configuration Registers=”0” , Output Port Registers=”0”)

     

    <your comment>

    If a P-port is configured as an output LOW and 5V is applied externally, this will cause a short to ground.

     

    -----------

     

    [Case2]

    P-port is configured as an output High (Configuration Registers=”0” , Output Port Registers=”1”)

     

    <My comment>

    Could you please let me know the behavior of TCA6416A?

    My customer worries that this device is broken in this case.

     

    -----------

     

    Regards,

    Kanemaru

  • 0 in reply to Hide
    Guru 21045 points

    Hi Brian-san,

     

    Could you please let us know the current status regarding this question?

    We would be grateful if you could reply as soon as possible.

     

    Regards,

    Kanemaru

  • 0 in reply to Hide
    TI__Mastermind 30260 points

    Kanemaru-san,

    In Case 2 there will not be damage to the device, but why would you apply 5V externally when a P-port is configured as an Output?

  • 0 in reply to Brian Berner
    Guru 21045 points

    Hi Brian-san,

     

    Thank you for your support!

    Our customer is studying the following circuit.

    So, they would like to use the output like the low active.

    Could you please let me ask the following question?

     

    ------

    [Q1]

    I understood that the voltage of the P-port pin is High(1.8V) when a P-port is configured as an output High(1.8V) and 2.8V is applied externally.

    Is my understanding correct?

    ------

     

    [Q2]

    This device has the 5V tolerant I/O ports.

    Therefore,  I understood that the current from VIN can't flow to VCCP.

    Is my understanding correct?

    And, could you please let me know if you have any advice?

    ------

     

    Regards,

    Kanemaru

  • 0 in reply to Hide
    Guru 21045 points

    Hi Brian-san,

     

    Could you please let us know the current status regarding this question?

    We would be grateful if you could reply as soon as possible.

     

    Regards,

    Kanemaru