TCA6424A: INT pin

Hirotaka Matsumoto

Part Number: TCA6424A
Other Parts Discussed in Thread: TCA6424

Hi all

Would you mind if we ask TCA6424A?

1. P1X ～ P2X are output setting
2. Reset assgined(return to initial conditions)
3. P1X ～ P2X return to default setting(input setting)
4. After that, is resetting detected and is transmitted as INT?
Because, our customer would like to detect changing of the configuration setting from output setting to input setting using INT pin.
Could you give us the reply?

Kind regards,

Hirotaka Matsumoto

over 7 years ago

0 fhoude over 7 years ago

TI__Mastermind 23226 points

Hello Hirotaka-san,

I believe you can do this if you allocate a pull-up or pull down resistor on the pin such that it has the opposite polarity than what it was as an output. For example, if your pin is set as an OUTPUT = HIGH, then when it is reset you much have a pull-down resistor to put the pin LOW when it changes to an INPUT. I will go in the lab to verify this and let you know.

-Francis Houde

0 Hirotaka Matsumoto over 7 years ago in reply to fhoude

Guru 27585 points

Hello Francis san

Thank you for your reply and your cooperation always!

We would like to confirm one point, OUTPUT is not always High, there is the case OUTPUT=Low.
So, is it suitable for both case?
Because our customer uses outputs with low and high.
And then, if there is no any pull-up or pull down resistor on the pin, we assume that it can't realize it.
(On our customer's circuit, there are no pull-up or pull-down at outputs.)

On the other hand, could you give us the reply about INT pin?

We appreciate your help always.

Kind regards,

Hirotaka Matsumoto

0 Hirotaka Matsumoto over 7 years ago in reply to Hirotaka Matsumoto

Guru 27585 points

Hi team

We are so sorry to rush you, however if you have some update, could you give us it?
Our customer needs this answer by next Monday.

Kind regards,

Hirotaka Matsumoto

0 Hirotaka Matsumoto over 7 years ago in reply to Hirotaka Matsumoto

Guru 27585 points

Hi team

Could you give us the reply?

Kind regards,

Hirotaka Matsumoto

0 BOBBY over 7 years ago in reply to Hirotaka Matsumoto

TI__Guru 73181 points

Hey Hirotaka-san,

Sorry for the late reply. I've tested with the TCA6424 EVM. Looking at the INT pin, it's original state is high. By applying a reset and watching the INT pin, INT stays high during and after the duration. Is there anymore information you needed?

Thanks,

-Bobby

0 Hirotaka Matsumoto over 7 years ago in reply to BOBBY

Guru 27585 points

Bobby san

Thank you for you reply!
OK, we got it!

Kind regards,

Hirotaka Matsumoto

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TCA6424A: INT pin