TMUX4053: TMUX4053 switching RS485 Vdd

Derek Cowburn

Part Number: TMUX4053
Other Parts Discussed in Thread: TMUX6201

Tool/software:

Hello. Given the +/-12V max nature of RS485, but the normal signal is 0-5V, can the TMUX4053 be used to segment RS485 and add terminating resistor in second pole?

over 1 year ago

0 Clemens Ladisch over 1 year ago

Guru 317750 points

The switch must be able to handle the voltages that actually can happen on the bus. Do all the drivers on your bus use the same ground, or how large can the offset be?

0 Kameron Hill over 1 year ago in reply to Clemens Ladisch

TI__Mastermind 24430 points

Hi Derek,

I agree with clemens and if you could answer his questions that would help.

In addition are you planning to supply the TMUX4053 with +/-12V supplies.

If you use +/-12V supplies you can pass signals within +/-12V through this device.

Please let me know what you think and myself and clemens are happy to help.

Regards,

Kameron

0 Clemens Ladisch over 1 year ago in reply to Kameron Hill

Guru 317750 points

The on-resistance of the TMUX405x is rather high. If you want to switch RS-485 signals with supplies as large as ±12 V, then the only choice is the TMUX6201/2.

0 Kameron Hill over 1 year ago in reply to Clemens Ladisch

TI__Mastermind 24430 points

Hello Derek,

I agree with Clemens and if you want to use multiple 1:1 switches to create a 2:1 3channel device that is possible by tying the drain pins together

Please let us know if this is something you would be interested in.

Regards,

Kameron

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TMUX4053: TMUX4053 switching RS485 Vdd