THVD1451: If customer could leave D, Y,Z pin floating if not use

Jessica Wu74

Part Number: THVD1451

Hi Team,

Could you please kindly help to check if customer could leave D,Y,Z pin floating if they don't use the function thoes pins? Thanks a lot for your support to check.

Best regards

Jie

over 2 years ago

0 Clemens Ladisch over 2 years ago

Guru 325820 points

Unused outputs can (and should) be left open.

The D input has an internal pull-up, so it can be left open.

0 Jessica Wu74 over 2 years ago in reply to Clemens Ladisch

TI__Expert 6540 points

Hi Clemens,

Thanks a lot for your support. One more question is for the A/B input and VCC, if there has another board send a 3.3V signal to A/B input of THVD1451, But VCC of the THVD1451 is 5V, should customer add a level shift there? Thanks a lot for your support to double check.

Best regards

Jie

0 Clemens Ladisch over 2 years ago in reply to Jessica Wu74

Guru 325820 points

RS-485/RS-422 bus voltages are not directly related to the supply voltages; what matters is the differential voltage (the voltage drop over the termination resistor). All drivers output at least ±1.5 V, while all receivers must be able to handle ±200 mV.

0 Eric Hackett over 2 years ago in reply to Clemens Ladisch

TI__Guru 74962 points

Clemens,

Thanks for the help!

Jessica,

Please let us know if you have any other questions.

Regards,

Eric Hackett

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THVD1451: If customer could leave D, Y,Z pin floating if not use