TPS2384: Setting unused pins

Kaji@PAN

Part Number: TPS2384
Other Parts Discussed in Thread: TPS23861

Hello,

I would like to ask you about setting unused pins.
Port3 and Port4 are unused.
Is it okay to mount a capacitor between P and N as a treatment for unused pins of P and N?

Best regards,

over 2 years ago

0 Raymond Lin over 2 years ago

TI__Mastermind 30806 points

Hi Kajii-san,

Please refer to this Application Document on how to properly terminate unused port connections: https://www.ti.com/lit/an/slva231a/slva231a.pdf?ts=1674494664269&ref_url=https%253A%252F%252Fwww.ti.com%252Flit%252Fds%252Fsymlink%252Ftps2384.pdf%253Fts%253D1674491458524%2526ref_url%253Dhttps%25253A%25252F%25252Fwww.ti.com%25252Fproduct%25252FTPS2384

This document goes in detail how to configure set of pins for an unused port as well as a reference schematic for a 1-port solution using the TPS2384.

Let us know if you have any further questions or concerns!

Thanks and Regards,

Raymond Lin

0 Kaji@PAN over 2 years ago in reply to Raymond Lin

Mastermind 7420 points

Thank you for your reply.

I am now considering measures against static electricity.
So I ask you again.
(Question 1)
Is it possible to implement measures 1 to 3 below?
1. Capacitor connection between P-N.
2. Connect P and N to 48V through a capacitor.
3. Connect P and N to ground through a capacitor.
(Question 2)
Is it possible to connect P and N directly to ground?
(Connecting N to ground shouldn't be a problem)

Best regards,

+1 Raymond Lin over 2 years ago in reply to Kaji@PAN

TI__Mastermind 30806 points

Hi Kajii-san,

Technically they should all be possible, however we highly recommend to follow the document for terminating unused pins/ports.

Please also do note TPS2384 is an older device based on 802.3af specifications and is not recommended for new designs. I would recommend TPS23861, which follows 802.3at specifications and is much easier in terms of hardware and software designs.

Thanks and Regards,
Raymond Lin

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TPS2384: Setting unused pins