TRS3232E-Q1: How to connect the unused pins & TVS selection

Sherry Liang

Part Number: TRS3232E-Q1

Dear team,

1. If I don't use RIN1, ROUT1, DIN1, and DOUT1 pins. How should I deal with them, float or connect to the GND?

2. regarding the TVS protection of the interface part. The two PIN pins DOUT2 and RIN2, DOUT2 needs to clamp the voltage to13.2V, and RIN2 needs to clamp the voltage to 25V. Is this correct?

Thanks & Best Regards,

Sherry

over 6 years ago

0 Miguel Robertson over 6 years ago

TI__Guru 62920 points

Hi Sherry,

You are correct about the TVS selection. For more details, you can reference this blog:

How to choose a TVS diode for RS-232, RS-485 and CAN based on voltage ratings

In many industrial and automotive applications, protecting the interface transceivers from all kinds of electrical overstress events is a major concern. Transient voltage suppressor (TVS) diodes are common…

By Hao L over 7 years ago in Technical articles > Industrial

Unused DIN ports should be pulled high or low. Unused DOUT, RIN, or ROUT ports can be left disconnected (floating).

Regards,

Max

Interface

Interface forum

TRS3232E-Q1: How to connect the unused pins & TVS selection