Hi Team,
We have two questions.
I’d greatly appreciate your verification.
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[Q1]
According to the datasheet of TCA9555, “When an I/O is configured as an input, FETs Q1 and Q2 are off, creating a high-impedance input”.
However, according to “SIMPLIFIED SCHEMATIC OF P-PORT I/Os”, the pull-up resistor(100kohm) is connected between VCC pin and I/O pin.
So, when an I/O is configured as an input, is I/O pin High??
Which mention is right?
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[Q2]
Our customer would like to use TCA9555 at the following condition.
I’m understanding that the I/O(Pn) pin is the high impedance when the power on.
Because, the default of I/O is the input which is the high impedance.
Is my understanding correct?
If yes, I’m understanding that the LED isn’t lighted if they connect the pull-down resistor between the Pn pin and GND.
Could you please let us know if you have any concern for this usage?
If no, could you please let us know if you have recommended device?
And, I guess that the default of I/O of TPS9535 is the input which is the high impedance.
Is my understanding correct?
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Regards,
Kanemaru