PCA9548A: Auto-Closing mux

Paul Domings

Prodigy 30 points

Part Number: PCA9548A

Is the PCA9548A an auto-closing mux?

over 5 years ago

0 Miguel Robertson over 5 years ago

TI__Guru 62920 points

Hi Paul,

What do you mean by "auto closing"?

Max

0 Paul Domings over 5 years ago in reply to Miguel Robertson

Prodigy 30 points

Hi Max,

Thanks for your quick response. Auto-closing is a mux that closes automatically after a given number (one, in most cases) of I2C transfers.

Paul

0 Miguel Robertson over 5 years ago in reply to Paul Domings

TI__Guru 62920 points

Paul,

Thanks for clarifying. No, the PCA9548A's channels are only enabled or disabled manually via I2C writes, they will not automatically toggle based on activity. Unfortunately I'm not aware of a TI I2C switch/mux with that ability.

Regards,
Max

0 Paul Domings over 5 years ago in reply to Miguel Robertson

Prodigy 30 points

Hey Max,

No problem. Not having having that feature in our case is good. Our I2C topology is root->PCA9548A mux->PCA9548A mux. What Linux refers to as "Parent-locked mux as a parent of a parent-locked mux". Auto-closing in this case would be troublesome so all good.

Thanks again for your quick response. Very helpful.

Regards,

Paul

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PCA9548A: Auto-Closing mux