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TCA6424A: ■About TCA6424A

user6448843
Prodigy 120 points
Part Number: TCA6424A

Tool/software:

◆Question

Is it okay to use this circuit for unused ports?
(Does it need to be connected to VCCI or GND?)

In Table 5-1. Pin Functions, it is set as an input at power up.

Best regards

  • 0
    Guru 297310 points

    Unused inputs should not be left floating. Configure them as outputs, or connect them to a valid logic voltage (with or without a resistor).

  • +1
    TI__Mastermind 37293 points

    Hi User,

    Best practice is to tied unused pins configured as INPUTs to either VCCP or GND through a resistor. 

    Otherwise, you can also configure these floating pins on power up to floating OUTPUTs. 

    If you leave them floating, there is a chance that the device will power up with an interrupt asserted because the voltage on the input is floating and subject to change. 

    Regards,

    Tyler