Omega 2S+ Ethernet Connection Problem
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A reliable wired network connection can be a great addition to a project!
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@akif-durmaz Check out our new Omega2S hardware design guide, there's a section on ethernet design!
https://github.com/OnionIoT/Omega2/blob/master/Documents/Omega2S Hardware Design Guide.pdf
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@Lazar-Demin
I've designed my PCB according to "Omega2S-Reference-Schematic" file and a PCB which had Omega2+.
Here's the part of Reference Schematic ;
In Reference Schematic RXIN0/RXIP0 and TXON0 and TXOP0 connects together after the resistors and goes through the same capacitor. In my design neither of the signals (RXIN0,RXIP0,TXON0,TXOP0) connects together each goes through their own resistor and capacitor (100nF each). Also pins 2 and 7 are pulled up to 3.3V in my design. Reason for these differences are our other device with Omega2+ has a properly working ethernet connection and it was designed by somebody else like I described. So I wanted to go with the working example in my hand.
The Ethernet Port part in Hardware Design Guide you posted seems to be the cropped version of Reference Schematic and it does not include the resistors part. Can that be a mistake or the whole circuitry should just include 100nF for pins 2-7 now?
I still did not solve my problem. We will design another PCB with Omega2S+ soon before that I would like to detect the source of the problem. Would you suggest that I should make the following adjustment by cutting lines and adding cable connections to see if it works?
- Cut the 3.3V line to the 2-7 make it so they are just connected to the ground through 100nF
- Connect R403-R404 and R405-R406 and use one 100nF for two of them.
After making these adjusments my circuit would be the same as Reference Schematic one.
Thank you for your reply and the Hardware Design link.
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@akif-durmaz I just followed the reference schema to add ethernet to my PCB based on Omega2S+, I concluded that Onion designers have provided their design so it seems logical that one would follow it. There are lots of wheels, no need to design a new one
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@crispyoz
My new design is not directly related to ethernet problem, we will change some modules on the card but since there is a problem with ethernet port I wanted to get to the bottom of it before the new card
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@akif-durmaz Hi ,For the Omega2S reference schematic ,there are two options for the ethernet connection,option1 is using ethernet transformer ,option2 is a simpler circuit which using resistor and capacitor to instead the transformer . and each of the option can work.
I had checked your ethernet port circuitry screenshot, there are some connection is not right, you can't connect the omega2S's ethernet signal line to the ethernet port.
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The lastest Omega2S reference schematic had deleted the R401~R406，C403 and C404.
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@JeffZhou
Hi. I went with Option 1 and used an ethernet connector with a transformer. The following schematic is from the datasheet of my ethernet connector ;
In reference to the picture I think my T+,T-,R+,R- connections are correct. As a secondary confirmation I have a different PCB containing Omega2+ with the same connections and it's ethernet connection has no problem.
If I misunderstood something please correct me, thank you for your reply.
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@akif-durmaz Hi ,please add a screenshot of the ethernet connector and transformer 's schematic.
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@JeffZhou
there was a product link in my original post but here, these are the only two pages from the datasheet;
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@akif-durmaz
Hi, i had checked the Normal ethernet connector（RJ45），it seems that the inside schematic isn't as the same as yours. Here the connector's sch has the same channel coil of RX/TX.SPEC of HR913550A
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@JeffZhou
Unfortunately I have no idea what those differences mean. However I know for a fact that this connector works as I connected it with another device. So I think my problem lays under something else.
Thank you for your interest and replies.
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@akif-durmaz Hi ，what i mean is you can try to use another ethernet connector.
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I am as yet looking for some appropriate arrangement!
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@Malcon4 Please check out the new Omega2S hardware design guide, there's a section on ethernet design!
https://github.com/OnionIoT/Omega2/blob/master/Documents/Omega2S Hardware Design Guide.pdf
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@Malcon4 here is the ethernet port that Omega2 using .
