Multiplex 4 UART Rx/Tx signals pairs to 1 Rx/Tx pair, I2C selectable

Ed Walker

Other Parts Discussed in Thread: SN74LV4052A

I have 4 UART's with Rx Tx that I want to multiplex to one Rx Tx pair.
The UART signal level is 1.8V.
Prefer I2C multiplex control to select which pair to pass through.

I have searched and can not find anything appropriate, can you help?

over 12 years ago

0 Avi Chami1 over 12 years ago

Mastermind 7395 points

What about SN74LV4052A (with logic control, not I2C)?

0 Ed Walker over 12 years ago in reply to Avi Chami1

Prodigy 5 points

Is the SN74LV4052A bidirectional?
For UART Rx receive and Tx transmit you need bidirectional ability.
Rx comes from the UART and Tx goes to the UART.

0 Avi Chami1 over 12 years ago in reply to Ed Walker

Mastermind 7395 points

Sure, it is an analog switch, so it simply connects the selected input with the output, the direction (for the analog switch) is irrelevant, signals can go in or out. Think of it as a mechanical switch, once closed, signals can cross it from any direction.

But, I remind you, it has TTL logic control, not I2C

0 Ed Walker over 12 years ago in reply to Avi Chami1

Prodigy 5 points

Perfect part, except not I2C, and we must have I2C control.

0 Avi Chami1 over 12 years ago in reply to Ed Walker

Mastermind 7395 points

You can control the part with an MSP430.

Logic

Logic forum

Multiplex 4 UART Rx/Tx signals pairs to 1 Rx/Tx pair, I2C selectable