Omega2+ USB to Ethernet Chip LAN9500A

Reply to Omega2+ USB to Ethernet Chip LAN9500A on Mon, 18 Dec 2017 14:35:38 GMT

Stefan s — Mon, 18 Dec 2017 14:35:38 GMT

Hi :),
would it possible to use the LAN9500A (USB to Ethernet Chip) and connect it directly to the TX+/- and RX +/- of the Omega2+ Pins?

http://www.microchip.com/DevelopmentTools/ProductDetails.aspx?PartNO=EVB-LAN9500A-LC

On the Omega2+ is running a Webserver.
I like to connect the Omeag2+ to any Computer via USB and then connect trough my Webbrowser to the Omegas Webserver.

Because there is no USB OTG Client on the Omega. I like to know if this would be possible with a USB 2 Ethernet IC.

And also I hope I can connect it without transformers:
https://www.intel.com/content/dam/doc/application-note/8255x-fast-ethernet-controllers-without-magnetics-appl-note.pdf

http://www.ti.com/lit/an/snla088a/snla088a.pdf

Reply to Omega2+ USB to Ethernet Chip LAN9500A on Fri, 22 Dec 2017 12:27:40 GMT

Stefan s — Fri, 22 Dec 2017 12:27:40 GMT

**** Microchip Comments Begin ****

for short distances ( within a PCB ) capacitive coupling is possible. See AN120
For longer distances Magnetics is recommended.
regards
Norbert

**** Microchip Comments End ******

http://ww1.microchip.com/downloads/en/AppNotes/Capacitive Coupling Ethernet Transceivers without Using Transformers.pdf

Reply to Omega2+ USB to Ethernet Chip LAN9500A on Fri, 22 Dec 2017 14:12:23 GMT

ccs hello — Fri, 22 Dec 2017 14:12:23 GMT

re: "transformerless" (skip the magnetics)
Doable, if

you are a good circuit designer
high tolerance on data transmission errors
environment (the circuit boards) and the actual wiring itself is properly shielded

Bottom-line: pushing the margin thin, is it worthwhile for a $1 investment?

ccs_hello