TXS0108E: Using TXS0108E as a simple isolator between my micro controller and the outside enviroment

Stralows

Part Number: TXS0108E

Hello,

I am designing a circuit board with a couple of communication protocols and IOs to be installed in an outdoor cabinet.

For instance I will need to have RS232 ports, or simple UART debug ports, or IOs, or even I2C ports to the outside.

I am already using the TXS0108E in my board to convert the voltage levels between my micro and other ICs, so I was wondering if I could use the remaining ports of it, to interface with the outside world. For instant having the UART pins going from the micro through the TXS0108E and straight to a connector . Also having an input coming from the outside through the TXS0108E and connected to my micro.

What should I be concerned with? should I forget this idea and add additional optocouplers for example?

Thank you in advance for the help

Best regards

over 6 years ago

0 Emrys Maier over 6 years ago

TI__Guru* 97046 points

Hello and welcome to the forums!
Our translation expert will get back with you by Monday.

If you can provide a schematic, block diagram, and/or rough layout it can be helpful for him when he makes his response.

0 Clemens Ladisch over 6 years ago

Guru 317000 points

The TXS has lots of ESD protection on its B port.

You need optocouplers only if you need galvanic isolation, most likely due to different ground potentials.

0 ShreyasRao over 6 years ago

TI__Guru 62180 points

Stralows,

Yes, you can use the other unused ports of the TXS0108 for interfacing other communication protocols. The TXS0108 supports both the push pull signals like the UART and open drain protocols like the I2C as well without the need for external pullup resistors.
Since this is a passive device, it doesnt have a true buffering capability to source or sink currents more than ~400uA.

0 Stralows over 6 years ago in reply to Clemens Ladisch

Prodigy 50 points

Hi Clemens,

Thank you very much for your reply !

Regards

0 Stralows over 6 years ago in reply to ShreyasRao

Prodigy 50 points

Hi Shreyas,

Thank you very much for your reply !

Regards

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TXS0108E: Using TXS0108E as a simple isolator between my micro controller and the outside enviroment